Functional Morphology of the Teleost Pituitary Gland

Schreibman, Martin P.; Leatherland, J. F.; McKeown, B.A.

doi:10.1093/icb/13.3.719

Cited by 135 publications

(41 citation statements)

References 66 publications

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“…In combination with experimental results, the possible function of the follicular cells in the RPD of isospondylous and apodal forms have been well elucidated by several investigators (OLIVEREAU, 1968;BALL and BAKER, 1969;SCHREIBMAN et al, 1973;HOLMES and BALL, 1974). Moreover, immunohistochemical and histophysiological studies have evidenced that the acidophil follicle cells in these fish produce prolactin which plays an important role in osmoregulation (OLIVEREAU, 1968;VAN OVERBEEKE, 1969, 1972;ALER, 1971a, b;NAGAHAMA, 1973).…”

Section: Discussionmentioning

confidence: 92%

Histological Observations on Some of the Endocrine Glands in the Ironfish, with Special Regard to the Hypophysis

Chibá

Honma

Usuda

1978

Arch. Histol. Jap., Arch. Histol. Jpn

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Section: Discussionmentioning

confidence: 92%

Histological Observations on Some of the Endocrine Glands in the Ironfish, with Special Regard to the Hypophysis

Chibá

Honma

Usuda

1978

Arch. Histol. Jap., Arch. Histol. Jpn

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“…Putative thyrotrop cells have been identified in several teleosts (see Schreibman et al 1973) based on cytological characteristics at the photon or electron microscope level. Of more value are observations of changes in pituitary cells in fish following radiothyroidectomy, treatment with goitrogens, or other manipulations of the pituitarythyroid axis.…”

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confidence: 99%

Environmental physiology of the teleostean thyroid gland: a review

Leatherland

1982

Environ Biol Fish

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140

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SynopsisRecent studies of thyroid hormone function are reviewed as they relate to the environmental physiology of teleost fish. In addition, reports dealing with the apparent interdependence of thyroid gland function with that of other endocrine glands are discussed with emphasis on the interrelated endocrine response associated with changing physiological status of teleosts.Seasonal changes in thyroid gland activity are described in several species. Although seasonal alterations in apparent thyroid status are concomitant with changes in ambient temperature, photoperiod and/or gonadal status, their biological significance is not fully understood and direct relationships are for the most part, not proven. Similarly, most reports of thyroid involvement in gonadal development or maturation are based on indirect evidence of the relationship. The exception to this is a study in immature or hypophysectomized goldfish in which thyroxine (T4) was shown to promote ovarian development and maturation, possibly acting collateralistically or synergistically with gonadotropin. Even in this study it is not clear whether the Td effect is a direct action on the ovarian tissue or an indirect action via the regulation of metabolites necessary for gonad metabolism. Integumentary silvering and retinal porphyropsin formation in salmonids are stimulated by administration of T4 or thyroid extracts. Administration of T4 or triiodothyronine (T3) enhances skeletal and somatic growth in some teleostean species, although the effect on somatic growth is most pronounced when these hormones act synergistically with somatotropin (STH) or androgens. The growth-promoting effects of T4 and T3 may be linked to their apparent involvement in lipid, carbohydrate, protein and vitamin metabolism. Alterations in apparent thyroid activity concomitant with changes in ambient temperature have been reported (for example correlated with seasonal ambient thermal changes), although there are marked contradictions in data presented by different investigators. Reported temperature-related effects on thyroid function are probably secondary responses of thyroid metabolism to altered temperatures. Evidence of a direct rate of thyroid hormones in the regulation of migration (and associated behavioural modifications), salmonid smoltification, oxygen consumption, and osmotic or ionic regulation although highly suggestive in a number of areas is inconclusive and requires further critical experimental evaluation.The pituitary control (by thyrotropin) of thyroid secretion of T4 is convincingly shown in several teleosts, and Receivrd 26.6.1980 Accepted 6.12.1980 0 Dr W. Junk Publishers, The Hague. Printed in The Netherlands. 0378.1909/82/0071-0083 $03.4083 evidence of an inhibitory hypothalamic control of thyrotrop activity is highly suggestive in some species. A thyrotropic effect of somatotropin preparations is well established in several teleostean species; the effect does not appear to be related to contamination of the somatotropin preparations with thyrotropin, and ma...

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“…The mechanism involved in the hypothalamic control of the hypophysis is very little known (Peter, 1973). Both direct and indirect contacts have been postulated (Green, 1951;Dodd and Kerr, 1963;Hill and Henderson, 1968;Jasinski and Gorbman, 1966;Leatherland, 1972;Zambrano, 1970Zambrano, , 1972Schreibman et al, 1973).…”

Section: Discussionmentioning

confidence: 99%

Relationship between the preoptico hypophysial system and the vascular system in the teleost Rita rita (Ham.)

Sathyanesan

Das

1975

J. Neural Transmission

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In Rita rita the internal carotid artery gives rise to hypothalamic and hypophysial arteries. The hypophysial artery directly enters the pituitary and largely contributes to the interface vasculature lying in between the neurohypophysis and the pars distalis which can be considered as an equivalent of the median eminence. Blood vessels from the interface vasculature enter the pars distalis. The hypothalamic artery gives rise to the primary capillary plexus in the infundibular floor and the portal vessels formed by it irrigate the glandular pituitary. Both, at the level of the hypothalamus and at the interface, neurosecretory material might get access to blood vessels. Thus, in Rita rita, not only the typical teleostean type of hypothalamo-hypophysial vascularization is present, but also an incipient tetrapodal pattern is evident.

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Functional Morphology of the Teleost Pituitary Gland

Cited by 135 publications

References 66 publications

Histological Observations on Some of the Endocrine Glands in the Ironfish, with Special Regard to the Hypophysis

Histological Observations on Some of the Endocrine Glands in the Ironfish, with Special Regard to the Hypophysis

Environmental physiology of the teleostean thyroid gland: a review

Relationship between the preoptico hypophysial system and the vascular system in the teleost Rita rita (Ham.)

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