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Quantitative immunocytochemistry of corticotropin-releasing factor (CRF). Studies on nonbiological models and on hypothalamic tissues of rats after hypophysectomy, adrenalectomy and dexamethasone treatment.

Abstract：

:Indirect immunofluorescence cytochemistry of ovine corticotropin releasing factor (oCRF) was performed by use of an antiserum raised against a conjugate of oCRF and bovine thyroglobulin. The staining intensity was quantitated by use of an automated microfluorimeter. In cryostat sections of formaldehyde fixed oCRF containing gelatine models, the staining intensity was dependent on the concentration of oCRF (1-100 microM) added to the gel. Immunoinhibition experiments showed that oCRF induced identical concentration-dependent (0.001-1 microM) quenching of the immunostaining of oCRF containing models and rat median eminence (ME) preparations. Comparison of immunoinhibition of oCRF and ME extracts indicates that approximately 1.5 ng of CRF immunoreactivity (CRFi) is present in the ME of intact adult male Wistar rats. In the hypothalamus of rats, the majority of CRFi nerve fibers are localized in the external zone of the median eminence, whereas a large population of CRFi cell bodies is present in the paraventricular nucleus. Manipulations of the pituitary-adrenal system result in changes in the distribution of CRFi in these neurons. One week after extirpation of the adrenals or of the pituitary gland, the CRFi in the ME was reduced to 32 +/- 3% and 48 +/- 6% respectively. This decrease in CRFi in the median eminence can be largely prevented by treatment of rats with dexamethasone in doses that effectively reduce plasma ACTH and corticosterone levels. In contrast to intact rats, CRFi cell bodies can be visualized in the paraventricular nucleus of non-colchicine-treated rats after adrenalectomy or hypophysectomy. These data support the view that the hypothalamic CRFi neurons play a central role in the control of pituitary-adrenal activity.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Brain Res

journal_title

Brain research

authors

Schipper J,Werkman TR,Tilders FJ

doi

10.1016/0006-8993(84)91458-6

subject

Has Abstract

pub_date

1984-02-13 00:00:00

pages

111-8

issue

1

eissn

0006-8993

issn

1872-6240

pii

0006-8993(84)91458-6

journal_volume

293

pub_type

杂志文章

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