Hypopituitarism pathophysiology: Difference between revisions

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__NOTOC__
__NOTOC__
{{DiseaseDisorder infobox |
  Name          =Hypopituitarism |
  Image          = Illu endocrine system New.png |
  Caption        = comment - By US Government - [http://training.seer.cancer.gov/module_anatomy/unit6_3_endo_glnds.html <font size="-2">''Derived from File:Illu_endocrine_system.jpg''</font>], <br> [https://commons.wikimedia.org/w/index.php?curid=15860440 <font size="-2">''Public Domain''</font>] |
}}
{{Hypopituitarism}}
{{Hypopituitarism}}
 
{{CMG}}; {{AE}} {{AEL}}, {{IQ}}
{{CMG}}


==Overview==
==Overview==
Hypopituitarism occurrs secondarly to [[ischemia]] of the [[pituitary gland]]. This [[ischemia]] can be due to [[hemorrhage]], [[tumors]], or [[brain injury]]. Compression of the [[blood vessels]] is one of the mechanisms that cause [[ischemia]] to the [[pituitary gland]] and leads to hypopituitarism. [[Pituitary adenomas]] cause compression of the [[Hypophyseal portal system|hypophyseal vessels]] leading to interruption in the [[blood]] supply of the [[pituitary gland]]. [[Traumatic brain injury]] either primary or secondary also leads to [[pituitary gland]] dysfunction.


==Pathophysiology==
==Pathophysiology==
* The hormones of the anterior pituitary include 2 [[protein]]s, 3 [[glycoprotein]]s and a polypeptide:
===Background on pituitary gland blood supply===
#[[prolactin]] (PRL) -  stimulates milk production in the [[breast]]
*In order to understand the [[pathophysiology]] of hypopituitarism, it is necessary to know the [[blood]] supply of the [[pituitary gland]], because hypopituitarism occurs mainly by [[ischemia]] through different mechanisms like [[hemorrhage]], [[tumors]] or [[brain injury]].<ref name="pmid18481181">{{cite journal| author=Dusick JR, Wang C, Cohan P, Swerdloff R, Kelly DF| title=Pathophysiology of hypopituitarism in the setting of brain injury. | journal=Pituitary | year= 2012 | volume= 15 | issue= 1 | pages= 2-9 | pmid=18481181 | doi=10.1007/s11102-008-0130-6 | pmc=4170072 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18481181  }}</ref><ref name="pmid17467517">{{cite journal| author=Schneider HJ, Aimaretti G, Kreitschmann-Andermahr I, Stalla GK, Ghigo E| title=Hypopituitarism. | journal=Lancet | year= 2007 | volume= 369 | issue= 9571 | pages= 1461-70 | pmid=17467517 | doi=10.1016/S0140-6736(07)60673-4 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=17467517 }}</ref>
#[[growth hormone]] (GH) - growth and [[glucose]] homeostasis
*The [[pituitary gland]] is composed of two parts anterior ([[adenohypophysis]]) and posterior ([[neurohypophysis]]). Both parts are supplied by the [[carotid arteries]].
#[[luteinizing hormone]] (LH) - [[menstrual cycle]] and reproduction
*[[Adenohypophysis]]: It receives [[blood]] supply from the [[Hypophyseal portal system|long and short hypophyseal arteries]], which arise from the [[internal carotid artery]] and the anterior portion of the [[circle of Willis]].
#[[follicle stimulating hormone]] (FSH) - same
*[[Neurohypophysis]]: It receives the [[blood]] supply from the inferior and middle [[Hypophyseal portal system|hypophyseal arteries]].
#[[thyroid stimulating hormone]] (TSH) - stimulates [[thyroxine]] production in the [[thyroid]]
[[Image: Gray1180.png|500 px|thumb|center|A pituitary gland anatomy By Henry Vandyke Carte - Via: Wikimedia.org<ref>Henry Gray (1918) Anatomy of the Human Body, Bartleby.com: Gray's Anatomy, Plate 721, Public Domain, <https://commons.wikimedia.org/w/index.php?curid=541543></ref>]]
#[[adrenocorticotropic hormone]] (ACTH) - stimulates [[glucocorticoid]] production in the [[adrenal gland]]


* These hormones excreted are secreted in individually characteristic pulsatile patterns, often with distinct [[circadian rhythm]], rather than at steady rates throughout 24 hours.  
=== Anterior pituitary (Adenohypophysis) ===
* The posterior pituitary is the site of release of the nonapeptide hormones [[antidiuretic hormone]] (ADH) and [[oxytocin]], the former regulating plasma [[osmolarity]] and the latter regulating [[uterus|uterine]] [[contraction (childbirth)|contractions]] during [[childbirth]] as well milk ejection from the breasts.
*[[Anterior pituitary gland|Anterior pituitary]] does not have a direct [[blood]] supply and is supplied by the [[hypophyseal portal system]].
* Deficiency of a single pituitary hormone occurs less commonly than deficiency of more than one hormone. Sometimes referred to as progressive pituitary hormone deficiency or partial hypopituitarism, there is usually a predictable order of hormone loss.  
*The [[hypophyseal portal system]] is a [[Fenestration|fenestrated]] set of [[capillaries]] that allows rapid exchange of [[hormones]] between the [[hypothalamus]] and [[anterior pituitary]].
* Generally, growth hormone is lost first, then luteinizing hormone deficiency follows. The loss of follicle-stimulating hormone, thyroid stimulating hormone, adrenocorticotopic hormones and prolactin typically follow much later. The progressive loss of pituitary hormone secretion is usually a slow process, which can occur over a period of months or years. Hypopituitarism does occasionally start suddenly with rapid onset of symptoms
*Occlusion of the [[blood]] supply and other [[vascular]] abnormalities of the [[hypophyseal portal system]] may also cause [[complications]] with the exchange of [[hormones]] between the [[hypothalamus]] and the [[pituitary gland]] leading to [[hypopituitarism]].
* Most people with hypopituitarism lack growth hormone as well as one or more others. As for the posterior pituitary, antidiuretic hormone deficiency is the main problem, while oxytocin deficiency rarely causes clinically significant problems.
 
=== Posterior pituitary (Neurohypophysis) ===
*[[Posterior pituitary]] has its own [[blood]] supply via [[inferior hypophyseal artery]] and is less commonly affected as compared to [[anterior pituitary]].
*If [[posterior pituitary]] is affected, it can result in [[Neurohypophysis|neurohypophseal]] dysfunction and [[ischemic necrosis]] of [[thirst]] center leading to increased [[osmotic]] threshold for thirst onset.<ref name="pmid17468192">{{cite journal |vauthors=Atmaca H, Tanriverdi F, Gokce C, Unluhizarci K, Kelestimur F |title=Posterior pituitary function in Sheehan's syndrome |journal=Eur. J. Endocrinol. |volume=156 |issue=5 |pages=563–7 |year=2007 |pmid=17468192 |doi=10.1530/EJE-06-0727 |url=}}</ref>
 
===Hypothalamic and pituitary hormones with their action on the target glands===
{| class="wikitable"
!
![[Hypothalamic]] [[hormone]]
!Axis involved
!Mode of action
![[Pituitary gland|Pituitary]] hormone
or target [[Organ (anatomy)|organ]]
!Action
|-
| rowspan="7" |[[Anterior]] [[pituitary]] [[hormones]]
|[[Thyrotropin-releasing hormone]]
|Hypothalmic-pituitary-thyroid (HPT) axis
[[Image:Thyroid system.png|center|200px|thumb|HPT axis - By Mikael Häggström, Via: Wikimedia.org<ref>All used images are in public domain. Public Domain<https://commons.wikimedia.org/w/index.php?curid=8567011></ref>]]
|Stimulatory
|[[Thyrotropin]]
|Stimulates [[triiodothyronine]] and [[thyroxine]] production
|-
| rowspan="2" |[[Corticotropin-releasing hormone]]
|Hypothalmic-pituitary-adrenal (HPA) axis
[[Image:HPA Axis Diagram (Brian M Sweis 2012).png|center|200px|thumb|HPA axis - By Brian M Sweis (Own work), Via: Wikimedia.org<ref>CC BY-SA 3.0 <https://commons.wikimedia.org/w/index.php?curid=23363130></ref>]]
|Stimulatory
|[[Corticotropin]]
|Stimulates production of [[cortisol]] and [[adrenal]] [[androgens]]
|-
|
|Stimulatory
|[[Prolactin]]
|Stimulates milk production from [[breasts]] in females
|-
|[[Gonadotropin-releasing hormone]]
|Hypothalamus pituitary testicles (HPG) axis
[[Image:Hypothalamus pituitary testicles axis.png|center|200px|thumb|HPG axis - By Testosterona-ciclo, Via: Wikimedia.org<ref>Acraciaderivative work: Boghog2 - Testosterona-ciclo.png, CC BY-SA 3.0, <https://commons.wikimedia.org/w/index.php?curid=11186183></ref>]]
|Stimulatory
|
* [[Follicle-stimulating hormone|Follicle stimulating hormone]]
* [[Luteinizing hormone|Leutinizing hormone]]
|
* Males: stimulates [[testosterone]] production and [[spermatogenesis]]
* Female: stimulates [[estradiol]] and [[progesterone]] production, [[ovulation]] and [[folliculogenesis]]
|-
|[[Dopamine]]
|
|Inhibitory
|[[Prolactin]]
|_
|-
|[[Growth hormone-releasing hormone]]
|
[[image:Endocrine growth regulation.jpg|center|200px|thumb|Endocrine growth regulation - By Mikael Häggström. Via: Wikimedia.org<ref>Used with permission. All used images are in public domain., Public Domain,<https://commons.wikimedia.org/w/index.php?curid=6699074></ref>]]
|Stimulatory
|[[Growth hormone]]
|Stimulates [[insulin-like growth factor 1]] production
|-
|[[Somatostatin]]
|
|Inhibitory
|[[Growth hormone]]
|_
|-
| rowspan="2" |[[Posterior]] [[pituitary]] [[hormones]]
|[[Vasopressin]]
|
|Stimulatory
|
|Stimulates free water reabsorption in the [[collecting ducts]]
|-
|[[Oxytocin]]
|
|Stimulatory
|[[Breast]], [[uterus]]
|Stimulates milk ejection and [[uterine contraction]]
|}
 
===Pathogenesis===
*Hypopituitarism occurrs mainly due to the destruction of the [[pituitary gland]] cells via [[ischemia]], [[inflammation]] or [[Infiltration (medical)|infiltration]]. However, [[ischemia]] is believed to be the cornerstone of the [[pathogenesis]] of hypopituitarism.<ref name="pmid12675508">{{cite journal| author=Arafah BM| title=Medical management of hypopituitarism in patients with pituitary adenomas. | journal=Pituitary | year= 2002 | volume= 5 | issue= 2 | pages= 109-17 | pmid=12675508 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12675508  }}</ref><ref name="Vance1994">{{cite journal|last1=Vance|first1=Mary Lee|title=Hypopituitarism|journal=New England Journal of Medicine|volume=330|issue=23|year=1994|pages=1651–1662|issn=0028-4793|doi=10.1056/NEJM199406093302306}}</ref>
 
==== Compression of the blood vessels ====
'''(a) [[Pituitary adenoma]]'''
*[[Pituitary adenoma]] ([[Secretion|secretory]] or non-secretory) is one of the common causes of compression of the [[Hypophyseal portal system|hypophyseal vessels]] resulting in [[ischemia]].<ref name="pmid10843153">{{cite journal| author=Arafah BM, Prunty D, Ybarra J, Hlavin ML, Selman WR| title=The dominant role of increased intrasellar pressure in the pathogenesis of hypopituitarism, hyperprolactinemia, and headaches in patients with pituitary adenomas. | journal=J Clin Endocrinol Metab | year= 2000 | volume= 85 | issue= 5 | pages= 1789-93 | pmid=10843153 | doi=10.1210/jcem.85.5.6611 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10843153  }}</ref>
*Large [[adenomas]] (more than 1.5 cm) cause greater loss of function than [[Microadenoma of the pituitary gland|microadenomas]]. They cause compression (due to a greater mass effect) of the [[pituitary stalk]] and the [[Hypophyseal portal system|hypophyseal portal vessels]], which supply [[Pituitary gland|the pituitary gland]] with [[blood]].
*The [[tumor]] growth in the [[pituitary gland]] participates in increasing the [[intrasellar]] pressure, which causes a decrease in the [[Hypophyseal circulation|hypophyseal]] [[blood flow]] leading to a decrease of [[hormonal]] delivery from the [[hypothalamus]] to the [[Pituitary gland|pituitary gland.]]
'''(b) [[Sheehan's syndrome]]'''
* [[Pituitary gland]] enlargement due to [[hypertrophy]] and [[hyperplasia]] of [[Lactotrophs|lactotrophic cells]] in [[anterior pituitary]] result in [[superior hypophyseal artery]] compression, which may be complicated by decreased portal pressure and [[vasospasm]] during delivery, playing an important role in the [[pathogenesis]] of [[Sheehan syndrome|Sheehan's syndrome]] leading to hypopituitarism.<ref name="pmid2159093">{{cite journal |vauthors=Scheithauer BW, Sano T, Kovacs KT, Young WF, Ryan N, Randall RV |title=The pituitary gland in pregnancy: a clinicopathologic and immunohistochemical study of 69 cases |journal=Mayo Clin. Proc. |volume=65 |issue=4 |pages=461–74 |year=1990 |pmid=2159093 |doi= |url=}}</ref>
'''(c) [[Carotid artery]] [[aneurysm]]'''
 
'''(d) [[Meningioma]]'''
 
'''(e) [[Craniopharyngioma]]'''
 
==== Traumatic brain injury (TBI) ====
Hypopituitarism may occur via any of the following mechanisms:
 
'''(a) [[Brain injury|Primary brain injury]]'''
 
'''(b) [[Trauma]]'''
*The [[anatomical]] sitting of the [[pituitary gland]] increases its susceptibility to getting injured from [[trauma]].
*It is believed that [[Necrosis|tissue necrosis]] results in the release of sequestered [[antigens]], precipitating [[autoimmunity]] of the [[pituitary gland]] and hypopituitarism in [[Sheehan's syndrome]].<ref name="pmid12213861">{{cite journal |vauthors=Goswami R, Kochupillai N, Crock PA, Jaleel A, Gupta N |title=Pituitary autoimmunity in patients with Sheehan's syndrome |journal=J. Clin. Endocrinol. Metab. |volume=87 |issue=9 |pages=4137–41 |year=2002 |pmid=12213861 |doi=10.1210/jc.2001-020242 |url=}}</ref><ref name="urlAUTOANTIBODIES IN SHEEHANS SYNDROME - ScienceDirect">{{cite web |url=http://www.sciencedirect.com/science/article/pii/S0140673665913619?via%3Dihub |title=AUTOANTIBODIES IN SHEEHAN'S SYNDROME - ScienceDirect |format= |work= |accessdate=}}</ref><ref name="pmid24434361">{{cite journal |vauthors=Falorni A, Minarelli V, Bartoloni E, Alunno A, Gerli R |title=Diagnosis and classification of autoimmune hypophysitis |journal=Autoimmun Rev |volume=13 |issue=4-5 |pages=412–6 |year=2014 |pmid=24434361 |doi=10.1016/j.autrev.2014.01.021 |url=}}</ref>
'''(c) [[Brain injury]] due to other events like [[hypotension]] or [[hypoxia]]'''
 
==Genetics==
Hypopituitarism is caused by a [[mutation]] in any one of the following [[genes]].<ref name="pmid14561704">{{cite journal |vauthors=Carvalho LR, Woods KS, Mendonca BB, Marcal N, Zamparini AL, Stifani S, Brickman JM, Arnhold IJ, Dattani MT |title=A homozygous mutation in HESX1 is associated with evolving hypopituitarism due to impaired repressor-corepressor interaction |journal=J. Clin. Invest. |volume=112 |issue=8 |pages=1192–201 |year=2003 |pmid=14561704 |pmc=213489 |doi=10.1172/JCI18589 |url=}}</ref><ref name="pmid16940453">{{cite journal |vauthors=Sobrier ML, Maghnie M, Vié-Luton MP, Secco A, di Iorgi N, Lorini R, Amselem S |title=Novel HESX1 mutations associated with a life-threatening neonatal phenotype, pituitary aplasia, but normally located posterior pituitary and no optic nerve abnormalities |journal=J. Clin. Endocrinol. Metab. |volume=91 |issue=11 |pages=4528–36 |year=2006 |pmid=16940453 |doi=10.1210/jc.2006-0426 |url=}}</ref><ref name="pmid10835633">{{cite journal |vauthors=Netchine I, Sobrier ML, Krude H, Schnabel D, Maghnie M, Marcos E, Duriez B, Cacheux V, Moers Av, Goossens M, Grüters A, Amselem S |title=Mutations in LHX3 result in a new syndrome revealed by combined pituitary hormone deficiency |journal=Nat. Genet. |volume=25 |issue=2 |pages=182–6 |year=2000 |pmid=10835633 |doi=10.1038/76041 |url=}}</ref><ref name="pmid11567216">{{cite journal |vauthors=Machinis K, Pantel J, Netchine I, Léger J, Camand OJ, Sobrier ML, Dastot-Le Moal F, Duquesnoy P, Abitbol M, Czernichow P, Amselem S |title=Syndromic short stature in patients with a germline mutation in the LIM homeobox LHX4 |journal=Am. J. Hum. Genet. |volume=69 |issue=5 |pages=961–8 |year=2001 |pmid=11567216 |pmc=1274372 |doi= |url=}}</ref><ref name="pmid9462743">{{cite journal |vauthors=Wu W, Cogan JD, Pfäffle RW, Dasen JS, Frisch H, O'Connell SM, Flynn SE, Brown MR, Mullis PE, Parks JS, Phillips JA, Rosenfeld MG |title=Mutations in PROP1 cause familial combined pituitary hormone deficiency |journal=Nat. Genet. |volume=18 |issue=2 |pages=147–9 |year=1998 |pmid=9462743 |doi=10.1038/ng0298-147 |url=}}</ref><ref name="pmid8768831">{{cite journal |vauthors=Pellegrini-Bouiller I, Bélicar P, Barlier A, Gunz G, Charvet JP, Jaquet P, Brue T, Vialettes B, Enjalbert A |title=A new mutation of the gene encoding the transcription factor Pit-1 is responsible for combined pituitary hormone deficiency |journal=J. Clin. Endocrinol. Metab. |volume=81 |issue=8 |pages=2790–6 |year=1996 |pmid=8768831 |doi=10.1210/jcem.81.8.8768831 |url=}}</ref><ref name="pmid1509263">{{cite journal |vauthors=Pfäffle RW, DiMattia GE, Parks JS, Brown MR, Wit JM, Jansen M, Van der Nat H, Van den Brande JL, Rosenfeld MG, Ingraham HA |title=Mutation of the POU-specific domain of Pit-1 and hypopituitarism without pituitary hypoplasia |journal=Science |volume=257 |issue=5073 |pages=1118–21 |year=1992 |pmid=1509263 |doi= |url=}}</ref><ref name="pmid15928241">{{cite journal |vauthors=Turton JP, Reynaud R, Mehta A, Torpiano J, Saveanu A, Woods KS, Tiulpakov A, Zdravkovic V, Hamilton J, Attard-Montalto S, Parascandalo R, Vella C, Clayton PE, Shalet S, Barton J, Brue T, Dattani MT |title=Novel mutations within the POU1F1 gene associated with variable combined pituitary hormone deficiency |journal=J. Clin. Endocrinol. Metab. |volume=90 |issue=8 |pages=4762–70 |year=2005 |pmid=15928241 |doi=10.1210/jc.2005-0570 |url=}}</ref><ref name="pmid16394081">{{cite journal |vauthors=Bhangoo AP, Hunter CS, Savage JJ, Anhalt H, Pavlakis S, Walvoord EC, Ten S, Rhodes SJ |title=Clinical case seminar: a novel LHX3 mutation presenting as combined pituitary hormonal deficiency |journal=J. Clin. Endocrinol. Metab. |volume=91 |issue=3 |pages=747–53 |year=2006 |pmid=16394081 |doi=10.1210/jc.2005-2360 |url=}}</ref><ref name="pmid9745452">{{cite journal |vauthors=Cogan JD, Wu W, Phillips JA, Arnhold IJ, Agapito A, Fofanova OV, Osorio MG, Bircan I, Moreno A, Mendonca BB |title=The PROP1 2-base pair deletion is a common cause of combined pituitary hormone deficiency |journal=J. Clin. Endocrinol. Metab. |volume=83 |issue=9 |pages=3346–9 |year=1998 |pmid=9745452 |doi=10.1210/jcem.83.9.5142 |url=}}</ref><ref name="pmid9768691">{{cite journal |vauthors=Flück C, Deladoey J, Rutishauser K, Eblé A, Marti U, Wu W, Mullis PE |title=Phenotypic variability in familial combined pituitary hormone deficiency caused by a PROP1 gene mutation resulting in the substitution of Arg-->Cys at codon 120 (R120C) |journal=J. Clin. Endocrinol. Metab. |volume=83 |issue=10 |pages=3727–34 |year=1998 |pmid=9768691 |doi=10.1210/jcem.83.10.5172 |url=}}</ref><ref name="pmid9920061">{{cite journal |vauthors=Rosenbloom AL, Almonte AS, Brown MR, Fisher DA, Baumbach L, Parks JS |title=Clinical and biochemical phenotype of familial anterior hypopituitarism from mutation of the PROP1 gene |journal=J. Clin. Endocrinol. Metab. |volume=84 |issue=1 |pages=50–7 |year=1999 |pmid=9920061 |doi=10.1210/jcem.84.1.5366 |url=}}</ref><ref name="pmid10634415">{{cite journal |vauthors=Pernasetti F, Toledo SP, Vasilyev VV, Hayashida CY, Cogan JD, Ferrari C, Lourenço DM, Mellon PL |title=Impaired adrenocorticotropin-adrenal axis in combined pituitary hormone deficiency caused by a two-base pair deletion (301-302delAG) in the prophet of Pit-1 gene |journal=J. Clin. Endocrinol. Metab. |volume=85 |issue=1 |pages=390–7 |year=2000 |pmid=10634415 |doi=10.1210/jcem.85.1.6324 |url=}}</ref><ref name="pmid15472175">{{cite journal |vauthors=Lee JK, Zhu YS, Cordero JJ, Cai LQ, Labour I, Herrera C, Imperato-McGinley J |title=Long-term growth hormone therapy in adulthood results in significant linear growth in siblings with a PROP-1 gene mutation |journal=J. Clin. Endocrinol. Metab. |volume=89 |issue=10 |pages=4850–6 |year=2004 |pmid=15472175 |doi=10.1210/jc.2003-031816 |url=}}</ref><ref name="pmid21123951">{{cite journal |vauthors=Yamamoto M, Iguchi G, Takeno R, Okimura Y, Sano T, Takahashi M, Nishizawa H, Handayaningshi AE, Fukuoka H, Tobita M, Saitoh T, Tojo K, Mokubo A, Morinobu A, Iida K, Kaji H, Seino S, Chihara K, Takahashi Y |title=Adult combined GH, prolactin, and TSH deficiency associated with circulating PIT-1 antibody in humans |journal=J. Clin. Invest. |volume=121 |issue=1 |pages=113–9 |year=2011 |pmid=21123951 |pmc=3007153 |doi=10.1172/JCI44073 |url=}}</ref><ref name="pmid15613420">{{cite journal |vauthors=Vallette-Kasic S, Brue T, Pulichino AM, Gueydan M, Barlier A, David M, Nicolino M, Malpuech G, Déchelotte P, Deal C, Van Vliet G, De Vroede M, Riepe FG, Partsch CJ, Sippell WG, Berberoglu M, Atasay B, de Zegher F, Beckers D, Kyllo J, Donohoue P, Fassnacht M, Hahner S, Allolio B, Noordam C, Dunkel L, Hero M, Pigeon B, Weill J, Yigit S, Brauner R, Heinrich JJ, Cummings E, Riddell C, Enjalbert A, Drouin J |title=Congenital isolated adrenocorticotropin deficiency: an underestimated cause of neonatal death, explained by TPIT gene mutations |journal=J. Clin. Endocrinol. Metab. |volume=90 |issue=3 |pages=1323–31 |year=2005 |pmid=15613420 |doi=10.1210/jc.2004-1300 |url=}}</ref><ref name="pmid23199197">{{cite journal |vauthors=Yang Y, Guo QH, Wang BA, Dou JT, Lv ZH, Ba JM, Lu JM, Pan CY, Mu YM |title=Pituitary stalk interruption syndrome in 58 Chinese patients: clinical features and genetic analysis |journal=Clin. Endocrinol. (Oxf) |volume=79 |issue=1 |pages=86–92 |year=2013 |pmid=23199197 |doi=10.1111/cen.12116 |url=}}</ref><ref name="pmid25845766">{{cite journal |vauthors=Wang W, Wang S, Jiang Y, Yan F, Su T, Zhou W, Jiang L, Zhang Y, Ning G |title=Relationship between pituitary stalk (PS) visibility and the severity of hormone deficiencies: PS interruption syndrome revisited |journal=Clin. Endocrinol. (Oxf) |volume=83 |issue=3 |pages=369–76 |year=2015 |pmid=25845766 |doi=10.1111/cen.12788 |url=}}</ref><ref name="pmid10084575">{{cite journal |vauthors=Mendonca BB, Osorio MG, Latronico AC, Estefan V, Lo LS, Arnhold IJ |title=Longitudinal hormonal and pituitary imaging changes in two females with combined pituitary hormone deficiency due to deletion of A301,G302 in the PROP1 gene |journal=J. Clin. Endocrinol. Metab. |volume=84 |issue=3 |pages=942–5 |year=1999 |pmid=10084575 |doi=10.1210/jcem.84.3.5537 |url=}}</ref><ref name="pmid15972577">{{cite journal |vauthors=De Marinis L, Bonadonna S, Bianchi A, Maira G, Giustina A |title=Primary empty sella |journal=J. Clin. Endocrinol. Metab. |volume=90 |issue=9 |pages=5471–7 |year=2005 |pmid=15972577 |doi=10.1210/jc.2005-0288 |url=}}</ref>
{| class="wikitable"
! rowspan="22" |Isolated
[[hormonal]] abnormalities
!Gene
!Inheritance
[Autosomal Recessive (AR),
 
Autosomal Dominant (AD),
 
X-linked (XL)]
!Phenotype
|-
|GH1
|AD, AR
|Isolated [[GH deficiency]]
|-
|[[GHRHR]]
|AR
|Isolated [[GH deficiency]]
|-
|TSHB
|AR
|Isolated [[TSH]] deficiency
|-
|TRHR
|AR
|Isolated TSH deficiency
|-
|TPIT
|AR
|Isolated [[ACTH]] deficiency
|-
|GnRHR
|AR
|[[HH]]
|-
|PC1
|AR
|[[ACTH deficiency]], [[hypoglycemia]], HH, [[obesity]]
|-
|[[POMC]]
|AR
|ACTH deficiency, [[obesity]], red hair
|-
|[[DAX1]]
|XL
|[[Adrenal hypoplasia congenital, X-linked|Adrenal hypoplasia congenital]] and HH
|-
|CRH
|AR
|[[Corticotropin-releasing hormone|CRH]] deficiency
|-
|[[KAL1 gene|KAL1]]
|XL
|[[Kallman syndrome]], [[renal agenesis]], synkinesia
|-
|[[FGFR1]]
|AD, AR
|Kallman syndrome, [[cleft lip and palate]], [[facial dysmorphism]]
|-
|[[Leptin]]
|AR
|HH, obesity
|-
|Leptin-R
|AR
|HH, obesity
|-
|GPR54
|AR
|[[HH]]
|-
|[[Kisspeptin]]
|AR
|HH
|-
|[[FSHB]]
|AR
|[[Amenorrhea|Primary amenorrhea]], defective [[spermatogenesis]]
|-
|LHB
|AR
|[[Delayed puberty]]
|-
|PROK2
|AD
|[[Kallman syndrome]], severe [[sleep disorder]], obesity
|-
|PROKR2
|AD, AR
|Kallman syndrome
|-
|''AVP-NPII''
|AR, AD
|[[Diabetes insipidus]]
|-
! rowspan="2" |Combined [[Pituitary gland|pituitary]] [[hormone]] deficiency
|''POU1F1''
|AR, AD
|[[GH]], [[TSH]], and [[prolactin]] deficiencies
|-
|''PROP1''
|AR
|GH, TSH, LH, FSH, prolactin, and evolving ACTH deficiencies
|-
! rowspan="8" |Specific syndromes
|[[HESX1]]
|AR, AD
|[[Septo-optic dysplasia]]
|-
|[[LHX3]]
|AR
|[[GH]], [[TSH]], [[LH]], [[FSH]], [[prolactin]] deficiencies, limited neck rotation
|-
|LHX4
|AD
|GH, TSH, ACTH deficiencies with [[cerebellar]] abnormalities
|-
|[[SOX3]]
|XL
|Hypopituitarism and [[mental retardation]]
|-
|''GLI2''
|AD
|[[Holoprosencephaly]] and multiple midline defects
|-
|SOX2
|AD
|[[Anophthalmia]], hypopituitarism, [[oesophageal atresia]]
|-
|''GLI3''
|AD
|[[Pallister-Hall syndrome]]
|-
|''[[PITX2]]''
|AD
|Rieger syndrome
|}
 
==Gross pathology==
*The predominant finding is [[hemorrhage]] with or without [[necrosis]].
*Pale, [[necrotic]] material is particularly found when there is a long interval between the acute clinical event and surgery.
 
==Microscopic pathology==
On microscopy, the following findings may be observed:
*[[Ischemic]] [[necrosis]] leading to scarring of [[neurohypophysis]]
*Scarring of [[Paraventricular nucleus|paraventricular]] and [[Supraoptic nucleus|supraoptic nuclei]]
*[[Electron microscopy|Electron microscopic]] shows evidence of abnormal [[fenestration]] of [[tumor]] [[vessels]] ([[pituitary adenoma]]) with fragmented [[basal membrane]]<nowiki/>s that may predispose the patient to [[hemorrhage]]
 
[[File:Webp.net-resizeimage.jpg|center|thumb|Histopathological image of nonfunctioning pituitary adenoma. Hematoxylin & eosin stain showing basophilic appearance of the cells - By Jensflorian (Own work), Via: Wikimedia.org<ref><http://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Common</ref>]]


==References==
==References==
{{Reflist|2}}
{{Reflist|2}}


​​
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{{WS}}
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[[Category:Medicine]]
[[Category:Endocrinology]]
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Latest revision as of 22:19, 29 July 2020

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Hypopituitarism Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ahmed Elsaiey, MBBCH [2], Iqra Qamar M.D.[3]

Overview

Hypopituitarism occurrs secondarly to ischemia of the pituitary gland. This ischemia can be due to hemorrhage, tumors, or brain injury. Compression of the blood vessels is one of the mechanisms that cause ischemia to the pituitary gland and leads to hypopituitarism. Pituitary adenomas cause compression of the hypophyseal vessels leading to interruption in the blood supply of the pituitary gland. Traumatic brain injury either primary or secondary also leads to pituitary gland dysfunction.

Pathophysiology

Background on pituitary gland blood supply

A pituitary gland anatomy By Henry Vandyke Carte - Via: Wikimedia.org[3]

Anterior pituitary (Adenohypophysis)

Posterior pituitary (Neurohypophysis)

Hypothalamic and pituitary hormones with their action on the target glands

Hypothalamic hormone Axis involved Mode of action Pituitary hormone

or target organ

Action
Anterior pituitary hormones Thyrotropin-releasing hormone Hypothalmic-pituitary-thyroid (HPT) axis
HPT axis - By Mikael Häggström, Via: Wikimedia.org[5]
 Stimulatory Thyrotropin Stimulates triiodothyronine and thyroxine production
Corticotropin-releasing hormone Hypothalmic-pituitary-adrenal (HPA) axis
HPA axis - By Brian M Sweis (Own work), Via: Wikimedia.org[6]
 Stimulatory Corticotropin Stimulates production of cortisol and adrenal androgens
Stimulatory Prolactin Stimulates milk production from breasts in females
Gonadotropin-releasing hormone Hypothalamus pituitary testicles (HPG) axis
HPG axis - By Testosterona-ciclo, Via: Wikimedia.org[7]
 Stimulatory
Dopamine Inhibitory Prolactin _
Growth hormone-releasing hormone
Endocrine growth regulation - By Mikael Häggström. Via: Wikimedia.org[8]
 Stimulatory Growth hormone Stimulates insulin-like growth factor 1 production
Somatostatin Inhibitory Growth hormone _
Posterior pituitary hormones Vasopressin Stimulatory Stimulates free water reabsorption in the collecting ducts
Oxytocin Stimulatory Breast, uterus Stimulates milk ejection and uterine contraction

Pathogenesis

Compression of the blood vessels

(a) Pituitary adenoma

(b) Sheehan's syndrome

(c) Carotid artery aneurysm

(d) Meningioma

(e) Craniopharyngioma

Traumatic brain injury (TBI)

Hypopituitarism may occur via any of the following mechanisms:

(a) Primary brain injury

(b) Trauma

(c) Brain injury due to other events like hypotension or hypoxia

Genetics

Hypopituitarism is caused by a mutation in any one of the following genes.[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]

Isolated

hormonal abnormalities

Gene Inheritance

[Autosomal Recessive (AR),

Autosomal Dominant (AD),

X-linked (XL)]

Phenotype
GH1 AD, AR Isolated GH deficiency
GHRHR AR Isolated GH deficiency
TSHB AR Isolated TSH deficiency
TRHR AR Isolated TSH deficiency
TPIT AR Isolated ACTH deficiency
GnRHR AR HH
PC1 AR ACTH deficiency, hypoglycemia, HH, obesity
POMC AR ACTH deficiency, obesity, red hair
DAX1 XL Adrenal hypoplasia congenital and HH
CRH AR CRH deficiency
KAL1 XL Kallman syndrome, renal agenesis, synkinesia
FGFR1 AD, AR Kallman syndrome, cleft lip and palate, facial dysmorphism
Leptin AR HH, obesity
Leptin-R AR HH, obesity
GPR54 AR HH
Kisspeptin AR HH
FSHB AR Primary amenorrhea, defective spermatogenesis
LHB AR Delayed puberty
PROK2 AD Kallman syndrome, severe sleep disorder, obesity
PROKR2 AD, AR Kallman syndrome
AVP-NPII AR, AD Diabetes insipidus
Combined pituitary hormone deficiency POU1F1 AR, AD GH, TSH, and prolactin deficiencies
PROP1 AR GH, TSH, LH, FSH, prolactin, and evolving ACTH deficiencies
Specific syndromes HESX1 AR, AD Septo-optic dysplasia
LHX3 AR GH, TSH, LH, FSH, prolactin deficiencies, limited neck rotation
LHX4 AD GH, TSH, ACTH deficiencies with cerebellar abnormalities
SOX3 XL Hypopituitarism and mental retardation
GLI2 AD Holoprosencephaly and multiple midline defects
SOX2 AD Anophthalmia, hypopituitarism, oesophageal atresia
GLI3 AD Pallister-Hall syndrome
PITX2 AD Rieger syndrome

Gross pathology

  • The predominant finding is hemorrhage with or without necrosis.
  • Pale, necrotic material is particularly found when there is a long interval between the acute clinical event and surgery.

Microscopic pathology

On microscopy, the following findings may be observed:

Histopathological image of nonfunctioning pituitary adenoma. Hematoxylin & eosin stain showing basophilic appearance of the cells - By Jensflorian (Own work), Via: Wikimedia.org[36]

References

  1. ↑ Dusick JR, Wang C, Cohan P, Swerdloff R, Kelly DF (2012). "Pathophysiology of hypopituitarism in the setting of brain injury". Pituitary. 15 (1): 2–9. doi:10.1007/s11102-008-0130-6. PMC 4170072. PMID 18481181.
  2. ↑ Schneider HJ, Aimaretti G, Kreitschmann-Andermahr I, Stalla GK, Ghigo E (2007). "Hypopituitarism". Lancet. 369 (9571): 1461–70. doi:10.1016/S0140-6736(07)60673-4. PMID 17467517.
  3. ↑ Henry Gray (1918) Anatomy of the Human Body, Bartleby.com: Gray's Anatomy, Plate 721, Public Domain, <https://commons.wikimedia.org/w/index.php?curid=541543>
  4. ↑ Atmaca H, Tanriverdi F, Gokce C, Unluhizarci K, Kelestimur F (2007). "Posterior pituitary function in Sheehan's syndrome". Eur. J. Endocrinol. 156 (5): 563–7. doi:10.1530/EJE-06-0727. PMID 17468192.
  5. ↑ All used images are in public domain. Public Domain<https://commons.wikimedia.org/w/index.php?curid=8567011>
  6. ↑ CC BY-SA 3.0 <https://commons.wikimedia.org/w/index.php?curid=23363130>
  7. ↑ Acraciaderivative work: Boghog2 - Testosterona-ciclo.png, CC BY-SA 3.0, <https://commons.wikimedia.org/w/index.php?curid=11186183>
  8. ↑ Used with permission. All used images are in public domain., Public Domain,<https://commons.wikimedia.org/w/index.php?curid=6699074>
  9. ↑ Arafah BM (2002). "Medical management of hypopituitarism in patients with pituitary adenomas". Pituitary. 5 (2): 109–17. PMID 12675508.
  10. ↑ Vance, Mary Lee (1994). "Hypopituitarism". New England Journal of Medicine. 330 (23): 1651–1662. doi:10.1056/NEJM199406093302306. ISSN 0028-4793.
  11. ↑ Arafah BM, Prunty D, Ybarra J, Hlavin ML, Selman WR (2000). "The dominant role of increased intrasellar pressure in the pathogenesis of hypopituitarism, hyperprolactinemia, and headaches in patients with pituitary adenomas". J Clin Endocrinol Metab. 85 (5): 1789–93. doi:10.1210/jcem.85.5.6611. PMID 10843153.
  12. ↑ Scheithauer BW, Sano T, Kovacs KT, Young WF, Ryan N, Randall RV (1990). "The pituitary gland in pregnancy: a clinicopathologic and immunohistochemical study of 69 cases". Mayo Clin. Proc. 65 (4): 461–74. PMID 2159093.
  13. ↑ Goswami R, Kochupillai N, Crock PA, Jaleel A, Gupta N (2002). "Pituitary autoimmunity in patients with Sheehan's syndrome". J. Clin. Endocrinol. Metab. 87 (9): 4137–41. doi:10.1210/jc.2001-020242. PMID 12213861.
  14. ↑ "AUTOANTIBODIES IN SHEEHAN'S SYNDROME - ScienceDirect".
  15. ↑ Falorni A, Minarelli V, Bartoloni E, Alunno A, Gerli R (2014). "Diagnosis and classification of autoimmune hypophysitis". Autoimmun Rev. 13 (4–5): 412–6. doi:10.1016/j.autrev.2014.01.021. PMID 24434361.
  16. ↑ Carvalho LR, Woods KS, Mendonca BB, Marcal N, Zamparini AL, Stifani S, Brickman JM, Arnhold IJ, Dattani MT (2003). "A homozygous mutation in HESX1 is associated with evolving hypopituitarism due to impaired repressor-corepressor interaction". J. Clin. Invest. 112 (8): 1192–201. doi:10.1172/JCI18589. PMC 213489. PMID 14561704.
  17. ↑ Sobrier ML, Maghnie M, Vié-Luton MP, Secco A, di Iorgi N, Lorini R, Amselem S (2006). "Novel HESX1 mutations associated with a life-threatening neonatal phenotype, pituitary aplasia, but normally located posterior pituitary and no optic nerve abnormalities". J. Clin. Endocrinol. Metab. 91 (11): 4528–36. doi:10.1210/jc.2006-0426. PMID 16940453.
  18. ↑ Netchine I, Sobrier ML, Krude H, Schnabel D, Maghnie M, Marcos E, Duriez B, Cacheux V, Moers A, Goossens M, Grüters A, Amselem S (2000). "Mutations in LHX3 result in a new syndrome revealed by combined pituitary hormone deficiency". Nat. Genet. 25 (2): 182–6. doi:10.1038/76041. PMID 10835633. Vancouver style error: initials (help)
  19. ↑ Machinis K, Pantel J, Netchine I, Léger J, Camand OJ, Sobrier ML, Dastot-Le Moal F, Duquesnoy P, Abitbol M, Czernichow P, Amselem S (2001). "Syndromic short stature in patients with a germline mutation in the LIM homeobox LHX4". Am. J. Hum. Genet. 69 (5): 961–8. PMC 1274372. PMID 11567216.
  20. ↑ Wu W, Cogan JD, Pfäffle RW, Dasen JS, Frisch H, O'Connell SM, Flynn SE, Brown MR, Mullis PE, Parks JS, Phillips JA, Rosenfeld MG (1998). "Mutations in PROP1 cause familial combined pituitary hormone deficiency". Nat. Genet. 18 (2): 147–9. doi:10.1038/ng0298-147. PMID 9462743.
  21. ↑ Pellegrini-Bouiller I, Bélicar P, Barlier A, Gunz G, Charvet JP, Jaquet P, Brue T, Vialettes B, Enjalbert A (1996). "A new mutation of the gene encoding the transcription factor Pit-1 is responsible for combined pituitary hormone deficiency". J. Clin. Endocrinol. Metab. 81 (8): 2790–6. doi:10.1210/jcem.81.8.8768831. PMID 8768831.
  22. ↑ Pfäffle RW, DiMattia GE, Parks JS, Brown MR, Wit JM, Jansen M, Van der Nat H, Van den Brande JL, Rosenfeld MG, Ingraham HA (1992). "Mutation of the POU-specific domain of Pit-1 and hypopituitarism without pituitary hypoplasia". Science. 257 (5073): 1118–21. PMID 1509263.
  23. ↑ Turton JP, Reynaud R, Mehta A, Torpiano J, Saveanu A, Woods KS, Tiulpakov A, Zdravkovic V, Hamilton J, Attard-Montalto S, Parascandalo R, Vella C, Clayton PE, Shalet S, Barton J, Brue T, Dattani MT (2005). "Novel mutations within the POU1F1 gene associated with variable combined pituitary hormone deficiency". J. Clin. Endocrinol. Metab. 90 (8): 4762–70. doi:10.1210/jc.2005-0570. PMID 15928241.
  24. ↑ Bhangoo AP, Hunter CS, Savage JJ, Anhalt H, Pavlakis S, Walvoord EC, Ten S, Rhodes SJ (2006). "Clinical case seminar: a novel LHX3 mutation presenting as combined pituitary hormonal deficiency". J. Clin. Endocrinol. Metab. 91 (3): 747–53. doi:10.1210/jc.2005-2360. PMID 16394081.
  25. ↑ Cogan JD, Wu W, Phillips JA, Arnhold IJ, Agapito A, Fofanova OV, Osorio MG, Bircan I, Moreno A, Mendonca BB (1998). "The PROP1 2-base pair deletion is a common cause of combined pituitary hormone deficiency". J. Clin. Endocrinol. Metab. 83 (9): 3346–9. doi:10.1210/jcem.83.9.5142. PMID 9745452.
  26. ↑ Flück C, Deladoey J, Rutishauser K, Eblé A, Marti U, Wu W, Mullis PE (1998). "Phenotypic variability in familial combined pituitary hormone deficiency caused by a PROP1 gene mutation resulting in the substitution of Arg-->Cys at codon 120 (R120C)". J. Clin. Endocrinol. Metab. 83 (10): 3727–34. doi:10.1210/jcem.83.10.5172. PMID 9768691.
  27. ↑ Rosenbloom AL, Almonte AS, Brown MR, Fisher DA, Baumbach L, Parks JS (1999). "Clinical and biochemical phenotype of familial anterior hypopituitarism from mutation of the PROP1 gene". J. Clin. Endocrinol. Metab. 84 (1): 50–7. doi:10.1210/jcem.84.1.5366. PMID 9920061.
  28. ↑ Pernasetti F, Toledo SP, Vasilyev VV, Hayashida CY, Cogan JD, Ferrari C, Lourenço DM, Mellon PL (2000). "Impaired adrenocorticotropin-adrenal axis in combined pituitary hormone deficiency caused by a two-base pair deletion (301-302delAG) in the prophet of Pit-1 gene". J. Clin. Endocrinol. Metab. 85 (1): 390–7. doi:10.1210/jcem.85.1.6324. PMID 10634415.
  29. ↑ Lee JK, Zhu YS, Cordero JJ, Cai LQ, Labour I, Herrera C, Imperato-McGinley J (2004). "Long-term growth hormone therapy in adulthood results in significant linear growth in siblings with a PROP-1 gene mutation". J. Clin. Endocrinol. Metab. 89 (10): 4850–6. doi:10.1210/jc.2003-031816. PMID 15472175.
  30. ↑ Yamamoto M, Iguchi G, Takeno R, Okimura Y, Sano T, Takahashi M, Nishizawa H, Handayaningshi AE, Fukuoka H, Tobita M, Saitoh T, Tojo K, Mokubo A, Morinobu A, Iida K, Kaji H, Seino S, Chihara K, Takahashi Y (2011). "Adult combined GH, prolactin, and TSH deficiency associated with circulating PIT-1 antibody in humans". J. Clin. Invest. 121 (1): 113–9. doi:10.1172/JCI44073. PMC 3007153. PMID 21123951.
  31. ↑ Vallette-Kasic S, Brue T, Pulichino AM, Gueydan M, Barlier A, David M, Nicolino M, Malpuech G, Déchelotte P, Deal C, Van Vliet G, De Vroede M, Riepe FG, Partsch CJ, Sippell WG, Berberoglu M, Atasay B, de Zegher F, Beckers D, Kyllo J, Donohoue P, Fassnacht M, Hahner S, Allolio B, Noordam C, Dunkel L, Hero M, Pigeon B, Weill J, Yigit S, Brauner R, Heinrich JJ, Cummings E, Riddell C, Enjalbert A, Drouin J (2005). "Congenital isolated adrenocorticotropin deficiency: an underestimated cause of neonatal death, explained by TPIT gene mutations". J. Clin. Endocrinol. Metab. 90 (3): 1323–31. doi:10.1210/jc.2004-1300. PMID 15613420.
  32. ↑ Yang Y, Guo QH, Wang BA, Dou JT, Lv ZH, Ba JM, Lu JM, Pan CY, Mu YM (2013). "Pituitary stalk interruption syndrome in 58 Chinese patients: clinical features and genetic analysis". Clin. Endocrinol. (Oxf). 79 (1): 86–92. doi:10.1111/cen.12116. PMID 23199197.
  33. ↑ Wang W, Wang S, Jiang Y, Yan F, Su T, Zhou W, Jiang L, Zhang Y, Ning G (2015). "Relationship between pituitary stalk (PS) visibility and the severity of hormone deficiencies: PS interruption syndrome revisited". Clin. Endocrinol. (Oxf). 83 (3): 369–76. doi:10.1111/cen.12788. PMID 25845766.
  34. ↑ Mendonca BB, Osorio MG, Latronico AC, Estefan V, Lo LS, Arnhold IJ (1999). "Longitudinal hormonal and pituitary imaging changes in two females with combined pituitary hormone deficiency due to deletion of A301,G302 in the PROP1 gene". J. Clin. Endocrinol. Metab. 84 (3): 942–5. doi:10.1210/jcem.84.3.5537. PMID 10084575.
  35. ↑ De Marinis L, Bonadonna S, Bianchi A, Maira G, Giustina A (2005). "Primary empty sella". J. Clin. Endocrinol. Metab. 90 (9): 5471–7. doi:10.1210/jc.2005-0288. PMID 15972577.
  36. ↑ <http://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Common

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