The anterior pituitary regulates several physiological processes, including stress, growth, reproduction, and lactation. Proper functioning of the anterior pituitary and of the organs it regulates can often be ascertained via blood tests that measure hormone levels.
Structure
The anterior pituitary complex
The pituitary gland sits in a protective bony enclosure called the sella turcica (Turkish chair/saddle). It is composed of three lobes: the anterior, intermediate, and posterior lobes. In many animals, these lobes are distinct. However, in humans, the intermediate lobe is but a few cell layers thick and indistinct; as a result, it is often considered part of the anterior pituitary. In all animals, the fleshy, glandular anterior pituitary is distinct from the neural composition of the posterior pituitary.[citation needed]
The anterior pituitary is composed of three regions:
Pars distalis
The pars distalis (distal part) comprises the majority of the anterior pituitary and is where the bulk of pituitary hormone production occurs. The pars distalis contains two types of cells, including chromophobe cells and chromophil cells.[1] The chromophils can be further divided into acidophils (alpha cells) and basophils (beta cells).[1] These cells all together produce hormones of the anterior pituitary and release them into the blood stream.[citation needed]
Nota bene: The terms "basophil" and "acidophil" are used by some books, whereas others prefer not to use these terms. This is due to the possible confusion with white blood cells, where one may also find basophils and acidophils.
Microanatomy of the pars distalis showing chromophobes, basophils, and acidophils
Eosinophilic follicles are a common normal finding in the anterior pituitary.
Pars tuberalis
The pars tuberalis (tubular part) forms a part of the sheath extending up from the pars distalis, which joins with the pituitary stalk (also known as the infundibular stalk or infundibulum), arising from the posterior lobe. (The pituitary stalk connects the hypothalamus to the posterior pituitary.) The function of the pars tuberalis is poorly understood. However, it has been seen to be important in receiving the endocrine signal in the form of TSHB (a β subunit of TSH), informing the pars tuberalis of the photoperiod (length of day). The expression of this subunit is regulated by the secretion of melatonin in response to light information transmitted to the pineal gland.[2][3] Earlier studies have shown localization of melatonin receptors in this region.[4]
Pars intermedia
The pars intermedia (intermediate part) sits between the pars distalis and the posterior pituitary, forming the boundary between the anterior and posterior pituitaries. It is very small and indistinct in humans.
The pouch eventually loses its connection with the pharynx, giving rise to the anterior pituitary. The anterior wall of Rathke's pouch proliferates, filling most of the pouch to form the pars distalis and the pars tuberalis. The posterior wall of the anterior pituitary forms the pars intermedia. Its formation from the soft tissues of the upper palate contrasts with the posterior pituitary, which originates from neuroectoderm.[5]
Function
The anterior pituitary contains five types of endocrine cell, and they are defined by the hormones they secrete: somatotropes (GH); lactotropes (PRL); gonadotropes (LH and FSH); corticotropes (ACTH) and thyrotropes (TSH).[6] It also contains non-endocrine folliculostellate cells which are thought to stimulate and support the endocrine cell populations.
Hormones secreted by the anterior pituitary are trophic hormones (Greek: trophe, “nourishment”). Trophic hormones directly affect growth either as hyperplasia or hypertrophy on the tissue it is stimulating. Tropic hormones are named for their ability to act directly on target tissues or other endocrine glands to release hormones, causing numerous cascading physiological responses.[5]
Hormone secretion from the anterior pituitary gland is regulated by hormones secreted by the hypothalamus. Neuroendocrine cells in the hypothalamus project axons to the median eminence, at the base of the brain. At this site, these cells can release substances into small blood vessels that travel directly to the anterior pituitary gland (the hypothalamo-hypophyseal portal vessels).
Other mechanisms
Aside from hypothalamic control of the anterior pituitary, other systems in the body have been shown to regulate the anterior pituitary's function. GABA can either stimulate or inhibit the secretion of luteinizing hormone (LH) and growth hormone (GH) and can stimulate the secretion of thyroid-stimulating hormone (TSH). Prostaglandins are now known to inhibit adrenocorticotropic hormone (ACTH) and also to stimulate TSH, GH and LH release.[9] Clinical evidence supports the experimental findings of the excitatory and inhibitory effects GABA has on GH secretion, dependent on GABA's site of action within the hypothalamic-pituitary axis.[10]
Effects of the anterior pituitary
Thermal homeostasis
The homeostatic maintenance of the anterior pituitary is crucial to our physiological well being. Increased plasma levels of TSH induce hyperthermia through a mechanism involving increased metabolism and cutaneousvasodilation. Increased levels of LH also result in hypothermia but through a decreased metabolism action. ACTH increase metabolism and induce cutaneous vasoconstriction, increased plasma levels also result in hyperthermia and prolactin decreases with decreasing temperature values. follicle-stimulating hormone (FSH) also may cause hypothermia if increased beyond homeostatic levels through an increased metabolic mechanism only.[11]
Gonadal function
Gonadotropes, primarily luteinising hormone (LH) secreted from the anterior pituitary stimulates the ovulation cycle in female mammals, whilst in the males, LH stimulates the synthesis of androgen which drives the ongoing will to mate together with a constant production of sperm.[5]
The anterior pituitary plays a role in stress response. Corticotropin releasing hormone (CRH) from the hypothalamus stimulates ACTH release in a cascading effect that ends with the production of glucocorticoids from the adrenal cortex.[5]
Behavioral effects
Development
The release of GH, LH, and FSH are required for correct human development, including gonadal development.[12]
Operating through the hypothalamic-pituitary-adrenal axis (HPA), the anterior pituitary gland has a large role in the neuroendocrine system's stress response. Stress induces a release of corticotropin-releasing hormone (CRH) and vasopressin from the hypothalamus, which activates the release of adrenocorticotropic hormone (ACTH) from the anterior pituitary gland. Then, this acts on the adrenal cortex to produce glucocorticoids such as cortisol. These glucocorticoids act back on the anterior pituitary gland and the hypothalamus with negative feedback to slow the production of CRH and ACTH.[13][14] Increased cortisol under stress conditions can cause the following: metabolic effects (mobilization of glucose, fatty acids, and amino acids), bone re-absorption (calcium mobilization), activation of the sympathetic nervous system response (fight or flight), anti-inflammatory effects, and inhibition of reproduction/growth.[12] When the anterior pituitary gland is removed (hypophysectomy) in rats, their avoidance learning mechanisms were slowed, but injections of ACTH restored their performance.[12] In addition, stress may delay the release of reproductive hormones such as luteinizing hormone (LH) and follicle-stimulating hormone (FSH).[15] This shows that the anterior pituitary gland is involved in behavioral functions as well as being part of a larger pathway for stress responses. It is also known that (HPA) hormones are related to certain skin diseases and skin homeostasis. There is evidence linking hyperactivity of HPA hormones to stress-related skin diseases and skin tumors.[16]
It has been shown that infant mice who were stroked with a paintbrush (simulating motherly care) had more release and binding of growth hormone (GH) from the anterior pituitary gland.[12]
Hyperpituitarism is the condition where the pituitary secretes excessive amounts of hormones. This hypersecretion often results in the formation of a pituitary adenoma (tumour), which are benign apart from a tiny fraction. There are mainly three types of anterior pituitary tumors and their associated disorders. For example, acromegaly results from excessive secretion of growth hormone (GH) often being released by a pituitary adenoma. This disorder can cause disfigurement and possibly death[19] and can lead to gigantism, a hormone disorder shown in “giants” such as André the Giant, where it occurs before the epiphyseal plates in bones close in puberty.[12] The most common type of pituitary tumour is a prolactinoma which hypersecretes prolactin.[20] A third type of pituitary adenoma secretes excess ACTH, which in turn, causes an excess of cortisol to be secreted and is the cause of Cushing's disease.[12]
Hypopituitarism is characterized by a decreased secretion of hormones released by the anterior pituitary. For example, hypo-secretion of GH prior to puberty can be a cause of dwarfism. In addition, secondary adrenal insufficiency can be caused by hypo-secretion of ACTH which, in turn, does not signal the adrenal cortex to produce a sufficient amount of cortisol. This is a life-threatening condition. Hypopituitarism could be caused by the destruction or removal of the anterior pituitary tissue through traumatic brain injury, tumor, tuberculosis, or syphilis, among other causes. This disorder used to be referred to as Simmonds' disease but now according to the Diseases Database it is called Sheehan syndrome.[21] If the hypopituitarism is caused by the blood loss associated with childbirth, the disorder is referred to as Sheehan syndrome.
History
Etymology
The anterior pituitary is also known as the adenohypophysis, meaning "glandular undergrowth", from the Greekadeno- ("gland"), hypo ("under"), and physis ("growth").
^Dardente, H (2012). "Melatonin-dependent timing of seasonal reproduction by the pars tuberalis: pivotal roles for long daylengths and thyroid hormones". Journal of Neuroendocrinology. 24 (2): 249–66. doi:10.1111/j.1365-2826.2011.02250.x. PMID22070540. S2CID12723490.
^Morgan, PJ; Williams, LM (1996). "The pars tuberalis of the pituitary: a gateway for neuroendocrine output". Reviews of Reproduction. 1 (3): 153–61. doi:10.1530/ror.0.0010153. PMID9414453.
^ abcdNelson, R. J. (2011) An Introduction to Behavioral Endocrinology, 4th Edition. Sunderland, MA: Sinauer Associates, Inc.ISBN978-0878936205
^Le Tissier, P.R; Hodson, D.J; Lafont C; Fontanaud P; Schaeffer, M; Mollard, P. (2012) Anterior pituitary cell networks. Front Neuroendocrinol. Aug; 33(3):252-66
^Malendowicz, L.K; Rucinski, M; Belloni, A.S; Ziolkowska, A; and Nussdorfer, G.C. (2007) Leptin and the regulation of the hypothalamic-pituitary-adrenal axis. Int Rev Cytol. 263: 63-102.
^Sone, M. and Osamura, R.Y. (2001) Leptin and the pituitary. Pituitary. Jan-Apr; 4(1-2): 15-23.
^Hedge, G.A. (1977) Roles for the prostaglandins in the regulation of anterior pituitary secretion. Life Sci. Jan 1;20(1):17-33.
^Racagni, G; Apud, J.A; Cocchi, D; Locatelli, V; Muller, E.E. (1982) GABAergic control of anterior pituitary hormone secretion. Life Sci. Aug 30;31(9):823-38.
^Lin, M.T; Ho, L.T; and Uang, W.N. (1983) Effects of anterior pituitary hormones and their releasing hormones physiological and behavioral functions in rats. J. steroid Biochem. Vol. 19(1) 433-38.
^ abcdefghiNelson, Randy J. (2011). An introduction to behavioral endocrinology (4th ed.). Sunderland, Massachusetts: Sinauer Associates. ISBN978-0878936205.
^Tajar, Abdelouahid; O'Connell, Matthew D L; Mitnitski, Arnold B; O'Neill, Terence W; Searle, Samuel D; Huhtaniemi, Ilpo T; Finn, Joseph D; Bartfai, György; Boonen, Steven; Casanueva, Felipe F; Forti, Gianni; Giwercman, Aleksander; Han, Thang S; Kula, Krzysztof; Labrie, Fernand; Lean, Michael E J; Pendleton, Neil; Punab, Margus; Silman, Alan J; Vanderschueren, Dirk; Rockwood, Kenneth; Wu, Frederick C W; European Male Aging Study Group (May 2011). "Frailty in relation to variations in hormone levels of the hypothalamic-pituitary-testicular axis in older men: results from the European male aging study". Journal of the American Geriatrics Society. 59 (5): 814–821. doi:10.1111/j.1532-5415.2011.03398.x. ISSN1532-5415. PMID21568952. S2CID43285151.
^Juszczak, Marlena; Monika Michalska (2006). "[The effect of melatonin on prolactin, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) synthesis and secretion]". Postępy Higieny I Medycyny Doświadczalnej. 60: 431–438. ISSN1732-2693.
