Endocrinology, Vol 134, 799-808, Copyright © 1994 by Endocrine Society

ARTICLES

Hybridization histochemical localization of activin receptor subtypes in rat brain, pituitary, ovary, and testis

VA Cameron, E Nishimura, LS Mathews, KA Lewis, PE Sawchenko and WW Vale
Clayton Foundation Laboratories for Peptide Biology, La Jolla, California 92037.

We have studied the distribution of activin receptor gene expression in the brain, pituitary, ovary, and testis of the adult rat by in situ hybridization, using probes complementary to the mRNAs encoding the mouse activin receptor subtypes II and IIB (ActRII and ActRIIB). Throughout the brain, ActRII mRNA expression was stronger than that of ActRIIB, and the patterns of expression were similar, although not identical. The most intense sites of activin receptor gene expression were the hippocampal formation, especially the dentate gyrus (ActRII), taenia tecta, and induseum griseum; the amygdala, particularly the amygdaloid-hippocampal transition zone; and throughout the cortical mantle, including the primary olfactory cortex (piriform cortex and olfactory tubercle); other regions of the cortex showing lesser degrees of hybridization included the cingulate cortex, claustrum, entorhinal cortex, and subiculum. In addition, moderate levels of expression were observed in several hypothalamic areas involved in neuroendocrine regulation, such as the suprachiasmatic, supraoptic, paraventricular, and arcuate nuclei. Moreover, activin receptors were also expressed in regions with inputs to the hypothalamus, both in the forebrain (bed nucleus of the stria terminalis and medial preoptic area) and within the brainstem (nucleus of the solitary tract, dorsal motor nucleus of the vagus, locus coeruleus, and mesencephalic raphe system). ActRII mRNA was observed in the intermediate lobe of the pituitary and, less prominently, in the anterior lobe, whereas ActRIIB appeared to be weakly expressed throughout all three pituitary divisions. In both male and female gonads, activin receptor message was clearly present in germ cells, and ActRII was the predominant form. In the ovary, in addition to an intense signal in the oocyte, activin receptor was expressed in corpus luteum and granulosa cells during diestrous day 1. In the testis, there was a strong ActRII signal in rounded spermatids, and a moderate signal in pachytene spermatocytes. In contrast, ActRIIB was absent within tubules, but weakly expressed in interstitial and Leydig cells. This is the first report of the distribution of activin receptor message in adult mammalian tissues. Although consistent with some previously suggested functional associations of activin-containing pathways in the brain, this pattern of expression suggests a greater role for activin than was previously appreciated in cortical, limbic, and somatosensory pathways and in the maturation of germ cells in the gonads of both male and female rats.

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