Enzymhistochemische Untersuchungen an Infundibulum und Hypophysenhinterlappen der normalen und beidseitig adrenalektomierten Ratte

Böck, R.; Goslar, H. G.

doi:10.1007/bf00995214

Cited by 25 publications

(4 citation statements)

References 38 publications

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“…Such an arrangement is found in cells involved in steroid or lipid synthesis or in lipid metabolism. Interestingly, enzymes involved in lipid metabolism have been histochemically demonstrated in these tanycytes (Akmayev et al, 1973;Bock and Goslar, 1969). b 1 tanycytes project to the ventricle numerous microvilli, small spherical protrusions containing endosomes, and large protrusions filled with polyribosomes (Rinne, 1966;Rodríguez et al, 1979;Wittkowski, 1967a,b) (Fig.…”

Section: B 1 Tanycytesmentioning

confidence: 99%

“…Early enzyme histochemical studies had shown that a tanycytes diVer from b tanycytes and react diVerently to adrenalectomy (Bock and Goslar, 1969;Goslar and Bock, 1970). A light and electron microscopic analysis of the distribution of adenosine triphosphatase has shown that this enzyme is abundant in the tanycytes facing the ventromedial nucleus (a 1 tanycytes) and is not detectable in the tanycytes facing the arcuate nucleus (a 2 tanycytes) or those of the median eminence (b 1,2 tanycytes) (Firth and Bock, 1976).…”

Section: B Morphology and Cytochemistrymentioning

confidence: 99%

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Hypothalamic Tanycytes: A Key Component of Brain–Endocrine Interaction

Rodríguez

Blázquez

Pastor

et al. 2005

International Review of Cytology

424

484

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Section: B 1 Tanycytesmentioning

confidence: 99%

Section: B Morphology and Cytochemistrymentioning

confidence: 99%

Hypothalamic Tanycytes: A Key Component of Brain–Endocrine Interaction

Rodríguez

Blázquez

Pastor

et al. 2005

International Review of Cytology

424

484

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“…Under different functional conditions, the surface composition of neural and glial elements undergoes dramatic alterations. For instance, adrenalectomy is followed by changes of enzyme activity (Akmayev and Fidelina, 1974;Bock and Goslar, 1969) and by an extension of nerve terminals abutting the basal lamina of the vascular space. The secretory surface is thereby markedly increased (Wittkowski, 1973;Wittkowski and Scheuer, 1974).…”

Section: Tanycytes: Reactions To Experimental Conditionsmentioning

confidence: 99%

Tanycytes and pituicytes: Morphological and functional aspects of neuroglial interaction

Wittkowski

1998

Microsc. Res. Tech.

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The hypothalamo‐hypophyseal system is supplied with two types of specialized glial cells that interact in neuroendocrine functional dynamics: the tanycytes and the pituicytes. Tanycytes are the dominating glial cells within the median eminence. Similar to radial glia, they extend from the floor of the third ventricle to the neurohemal surface of the median eminence. Pituicytes, as specialized astrocytes, are the main glial cells of the neural lobe. They are in intimate contact with the perivascular space of the sinusoidal vessels. Morphological similarities between the two cell types focus on their interaction with terminal branches of hypothalamic neurons in both regions of the neurohypophysis, the median eminence and the neural lobe. Release of hypothalamic hormones is apparently influenced by pituicytes and tanycytes. For instance, both types of cells are capable of closing or opening the access to the vessels. Thereby, in contrast to the “blood–brain‐barrier” function of astrocytes, pituicytes and tanycytes display “brain–blood‐barrier” functions. Pituicytes are characterized by the expression of specific membrane‐bound receptors for opioids, vasopressin, and β‐adrenoceptors, indicating that they receive input by numerous neuroactive substances. Integration of these incoming signals may result in a regulation of neurosecretion, especially by morphological changes and by modulation of extracellular ion concentrations. Comparable modulatory mechanisms of tanycytes have not yet been elucidated in a convincing manner. Besides possible regulatory functions, tanycytes are considered to possess guiding functions for hypothalamic axons and to be involved in transport mechanisms between ventricle and blood vessels of the portal system. Microsc. Res. Tech. 41:29–42, 1998 © 1998 Wiley‐Liss, Inc.

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“…Only a few histochemical studies of the ependyma of the median eminence have been made (Bock & Goslar, 1969;Goslar & Bock, 1970). In some birds the basal processes of the median eminence ependyma are loaded with aldehyde fuchsin-positive material (Oksche, Laws, nence include Bern et al (1966), Matsui (1966a,¿>), Wittkowski (1967aWittkowski ( , 1969, Matsui & Kobayashi (1968), Rodriguez (1968Rodriguez ( , 1969ft, 1972, Calas & Assenmacher (1970), , Kobayashi (1970), Kobayashi, Matsui & Ishii (1970) .…”

Section: Transporting Ependymamentioning

confidence: 99%