Incorporation of amino acids into proteins of the hypothalamus of prepuberal female rats after estradiol treatment.

Abstract:

:The arcuate nucleus-median eminence complex (AM) undergoes major structural and functional changes during normal puberty or if exposed to a pulse of estradiol in the prepuberal period. Those changes are expressed by increased synaptogenesis and by a drastic alteration in the feedback control of anterior pituitary gland hormone release. In this study we investigated the effects of estradiol benzoate (EB) on specific proteins in this hypothalamic area. Prepuberal, 25-day-old female rats were administered 10 micrograms of EB s.c. in oil or sesame oil vehicle. The animals were decapitated either 17 or 42 h after treatment. The brains were removed, blocked and serially sections at 300 micron using a Vibratome. The AM was dissected out and incubated for 6 h in a medium containing 35S-methionine and 35S-cysteine. Proteins from the AM were separated by two-dimensional gel electrophoresis, and the gels were exposed to X-ray film. The resulting autofluorographs were analyzed by scanning densitometry. The results show that the incorporation of labeled amino acids was increased in 10 proteins and decreased in 2 proteins in rats killed 17 h after EB. At 42 h after EB, 6 proteins showed an increased incorporation of amino acids and two proteins showed a decrease. Our results suggest that one or several of these proteins might be involved in the neuroendocrine and structural changes observed in the AM during puberty.

journal_name

Neuroendocrinology

journal_title

Neuroendocrinology

authors

Rodriguez-Sierra JF,Heydorn WE,Creed GJ,Jacobowitz DM

doi

10.1159/000124775

subject

Has Abstract

pub_date

1987-06-01 00:00:00

pages

459-64

issue

6

eissn

0028-3835

issn

1423-0194

journal_volume

45

pub_type

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