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Vasopressin gene expression in the normal and Brattleboro rat: a histological analysis in semi-thin sections with biotinylated oligonucleotide probes

AF Guitteny, B Fouque, R Teoule and B Bloch

Laboratoire d'Endocrinologie Experimentale, Universite de Bordeaux II, France.

We analyzed expression of the vasopressin (AVP) gene in semi-thin sections in normal and Brattleboro rats by using in situ hybridization and immunohistochemistry. AVP mRNA was detected as follows: vibratome sections of rat hypothalamus were hybridized with a biotinylated oligonucleotide probe, embedded in Araldite, and cut into semi-thin sections which were reacted with streptavidin-alkaline phosphatase and the appropriate substrate. Adjacent serial sections were treated by immunohistochemistry to detect AVP or oxytocin immunoreactivity. In normal rat, AVP mRNA can be detected in magnocellular neurons of the supraoptic and paraventricular nuclei and in parvocellular neurons of the suprachiasmatic nucleus. AVP mRNA was present throughout the cytoplasm of the cell bodies, their processes, and in punctate structures in the vicinity of the AVP cell bodies. Most neurons containing AVP mRNA also contain AVP immunoreactivity, but the staining intensity was not consistently correlated for each reaction. A few neurons contained AVP mRNA without detectable AVP immunoreactivity. In the Brattleboro rat, staining intensity of the reaction was lower than in normal rat and the AVP mRNA was restricted mostly to the periphery of the cytoplasm. In this strain, the neurons containing the AVP mRNA did not contain AVP or oxytocin immunoreactivity. These results demonstrate that neuropeptide mRNA can be detected in semi-thin sections with a biotinylated oligonucleotide probe, and that AVP gene deletion provokes modification of the intracellular localization of the AVP mRNA.

Volume 37, Issue 10, pp. 1479-1487, 10/01/1989
Copyright © 1989 by The Histochemical Society


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