Calcitonin mRNA activity in young obese (fa/fa) Zucker rats.

Abstract:

:Alterations in both calcitonin (CT) secretion and plasma calcium were recently described in adult obese Zucker rats. We have investigated the CT biosynthetic activity of thyroid glands in 30-day-old obese Zucker rats (fa/fa), and their controls (Lean). Plasma calcium level was significantly increased (+0.6 mg/dl) in obese animals, but plasma phosphate was unchanged. Plasma CT levels measured by radioimmunoassay (RIA) were significantly decreased in fatty (0.50 +/- 0.03 vs 0.68 +/- 0.03 ng/ml in Leans; P less than 0.001), but thyroidal hormone content was not different between Lean and fatty rats (68.7 +/- 5.1 in Leans vs 60.5 +/- 3.6 ng/gland in fatty rats). mRNA was extracted from 10 thyroids, and translated in a rabbit reticulocyte lysate (NEN) in the presence of [35S]methionine. After polyacrylamide gel electrophoresis, specific immunoprecipitates were autoradiographed and quantified by integration. A 50% decrease in translatable CT mRNA was observed in fatty rats. In basal conditions, the biosynthetic activity of C cells in obese rats correlates with the secretion rate of the hormone in the face of unchanged thyroidal CT contents.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Segond N,Jullienne A,Tahri EH,Garel JM

doi

10.1016/0014-5793(84)81083-2

subject

Has Abstract

pub_date

1984-08-20 00:00:00

pages

86-9

issue

1

eissn

0014-5793

issn

1873-3468

pii

0014-5793(84)81083-2

journal_volume

174

pub_type

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