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Vasopressin and Oxytocin Neurones of Hypothalamic Supraoptic and Paraventricular Nuclei Co‐Express mRNA for Type‐1 andType‐2 Corticotropin‐Releasing Hormone Receptors

The presence of corticotropin‐releasing hormone (CRH) receptors type‐1 (CRHR‐1) and type‐2 (CRHR‐2α) in the hypothalamic supraoptic (SON) and paraventricular (PVN) nuclei, and the effects of i.c.v. injection of CRH and urocortin on arginine vasopressin (AVP) and oxytocin release, have suggested that CRH ligands have a role in osmoregulation. In this study, double labelling in situ hybridization using 35S‐labelled CRHR‐1 or CRHR‐2α and digoxigenin‐labelled AVP, oxytocin or CRH riboprobes was employed to examine the localization of CRHR‐1 or CRHR‐2α mRNA in the SON and PVN of control and osmotically stimulated rats. Rats received an i.p. hypertonic saline (1.5 M) injection or isotonic saline injection (controls), or 2% NaCl intake (salt loading) or tap water (controls) for 12 days. While CRHR‐1 mRNA was undetectable in the SON and PVN in control rats, its expression was increased markedly at 4 h after i.p. hypertonic saline injection or after 12 days salt loading. Of the cells labelled with digoxigenin‐AVP, 53% in the SON and 90% in the PVN coexpressed CRHR‐1 mRNA after i.p. hypertonic saline injection. In oxytocinergic neurones, 73% in the SON and 91% in the PVN showed CRHR‐1 autoradiographic grains higher than background levels after i.p. hypertonic saline injection. In addition, i.p. hypertonic saline induced CRHR‐1 mRNA expression in digoxigenin‐CRH stained cells in the parvocellular PVN. CRHR‐2α transcripts were present in both the SON and PVN under basal conditions, and salt loading, but not acute i.p. hypertonic saline injection, further stimulated this expression. Double labelling in situ hybridization showed colocalization of CRHR‐2α mRNA with AVP and oxytocin mRNA in the SON. These studies support a role for CRH and urocortin regulating the hypothalamo‐neurohypophyseal system, and suggest a direct action of the peptides in the magnocellular neurones.