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The ontogeny of [3H]kainic acid binding in rat forebrain was studied quantitatively using in vitro receptor autoradiography. Specific binding was detectable in ventral thalamus, hippocampus, striatum and olfactory bulb by postnatal day 1. In regions with high densities of receptors in adulthood, such as CA3, dentate gyrus and striatum, binding increased(More)
Many studies have indicated that neuropeptide Y (NPY) stimulates and leptin inhibits food intake. In line with this, intracerebroventricular injection of NPY (10 microg) stimulated and leptin (10 microg) inhibited intake of a sucrose solution when female rats were required to obtain the solution from a bottle. However, NPY inhibited and leptin stimulated(More)
Oxytocin (OT) neurotransmission in the brain has a facilitatory effect on sexual receptivity in rats. This effect of OT is dependent on priming by ovarian steroids, estrogen and progesterone. These steroids modulate OT binding in specific brain nuclei, including the ventrolateral portion of the ventromedial hypothalamic nucleus (vlVMN). In the present(More)
Lactating rats were used in experiments to examine the role of the dopamine system in the regulation of ongoing maternal behavior. Administration of haloperidol disrupted retrieval behavior and nest building in a dose-dependent manner but not nursing behavior and pup licking. Feeding behavior including carrying of food pellets to the nest and general(More)
The binding characteristics and central distribution of 125I-Linear AVP antagonist, a new ligand for vasopressin binding sites, are described in the following studies. Saturation studies performed on rat brain septal membranes demonstrated that 125I-Linear AVP antagonist binds to a single class of sites with high affinity (55 pM) and limited capacity (88(More)
Oxytocin (OT) neurotransmission plays a role in the facilitation of steroid-dependent sexual receptivity in the rat. One way in which the ovarian steroid 17 beta-estradiol (E2) has been shown to modulate OT transmission is by increasing OT receptor binding in certain brain areas involved in the regulation of female sexual behavior such as the ventromedial(More)
I.p. injections of DSP-4 in male rats decreased norepinephrine (NE) levels to varying degrees throughout the brain with 66.7% reductions in the hypothalamic paraventricular nucleus. Intake of intraorally infused sucrose was reduced for 14 days but daily pellet intake recovered within 5 days post-injection. Intraventricular NE restored intraoral sucrose(More)
Oxytocin (OT) receptor binding in the ventromedial hypothalamic nucleus is regulated by testosterone (T) in male rats. However, T is metabolized in the brain, and many of the central effects of T are mediated by its metabolites. The experiments reported here were designed to determine whether T affects OT receptor binding directly or through the action of(More)
A recently developed ligand with very high affinity and selectivity for the vasopressin (AVP) V1a receptor subtype (i.e. [125I]Linear AVP antagonist ([125I]-LinAntag) was used to describe the distribution of AVP binding sites in the hamster brain, and to determine whether AVP receptor binding was influenced by testicular hormones in sites involved in the(More)