Arginine vasotocin alters hamster pituitary LH and prolactin secretion in vitro

Neuroendocrine Effects of Light Deprivation and Pinealectomy in vivo on the Time Course of Changes in Prolactin Cell Activity in vitro

“…Other studies have shown that pituitaries from blinded male hamsters secrete 60% less immunoreactive PRL in vitro than glands from intact, long photoperiod-exposed controls [6). Similarly, PRL released by pituitaries from male hamsters maintained on short days for 11 weeks is re duced by 75% when compared to that by glands from long photoperiod-exposed controls [36].…”

Neuroendocrine Effects of Light Deprivation and Pinealectomy in vivo on the Time Course of Changes in Prolactin Cell Activity in vitro

“…Other studies have shown that pituitaries from blinded male hamsters secrete 60% less immunoreactive PRL in vitro than glands from intact, long photoperiod-exposed controls [6). Similarly, PRL released by pituitaries from male hamsters maintained on short days for 11 weeks is re duced by 75% when compared to that by glands from long photoperiod-exposed controls [36].…”

Immunohistochemical characterization of chicken pituitary cells containing the vasotocin VT2 receptor

“…As mentioned earlier, studies in mammalian species have documented gonadotropin-releasing effects of AVP and oxytocin in rats and hamsters (Blask et al 1982;Ono et al 1985;Evans and Catt 1989). AVP also elicits a dose-dependent increase in TSH release from rat pituitary cells (Lumpkin et al 1987), whereas oxytocin has an inhibitory effect on growth hormone release under basal conditions (Franci et al 1993).…”

“…AVT stimulates prolactin release from cultured anterior pituitary cells in the turkey, although the physiological significance of this effect has been questioned (Proudman and Opel 1988;El Halawani et al 1992). AVT or AVP augment the release of prolactin in vivo in rats (Vaughan et al 1978;Kjaer et al 1991) and in vitro in rats (Vaughan et al 1975) and hamsters (Blask et al 1982). Moreover, passive immunization against AVP attenuates the suckling-induced increase of plasma prolactin in lactating rats (Nagy et al 1991).…”

“…Anatomical and physiological data suggest that AVT and, to a lesser extent, mesotocin may play similar hypophysiotropic functions in non-mammalian vertebrates (Mikami and Yamada 1984;Tennyson et al 1985;Tonon et al 1986;Robinzon et al 1988;Castro et al 1988;Moons et al 1988;Baker et al 1996;Romero et al 1998;Romero and Wingfield 2001). One of the most documented hypophysiotropic functions of AVP/AVT is the stimulation of adrenocorticotropic hormone (ACTH) release from corticotropes during stress responses (Rivier and Vale activity in rats (Lumpkin et al 1987;Childs et al 1989;Liu and Ben-Jonathan 1994) and regulate secretion of luteinizing hormone (LH) from gonadotropes in hamsters and rats (Blask et al 1982;Ono et al 1985;Evans and Catt 1989).…”

Neuroendocrine Effects of Light Deprivation and Pinealectomy in vivo on the Time Course of Changes in Prolactin Cell Activity in vitro

“…Other studies have shown that pituitaries from blinded male hamsters secrete 60% less immunoreactive PRL in vitro than glands from intact, long photoperiod-exposed controls [6). Similarly, PRL released by pituitaries from male hamsters maintained on short days for 11 weeks is re duced by 75% when compared to that by glands from long photoperiod-exposed controls [36].…”

Immunohistochemical characterization of chicken pituitary cells containing the vasotocin VT2 receptor

“…As mentioned earlier, studies in mammalian species have documented gonadotropin-releasing effects of AVP and oxytocin in rats and hamsters (Blask et al 1982;Ono et al 1985;Evans and Catt 1989). AVP also elicits a dose-dependent increase in TSH release from rat pituitary cells (Lumpkin et al 1987), whereas oxytocin has an inhibitory effect on growth hormone release under basal conditions (Franci et al 1993).…”

“…AVT stimulates prolactin release from cultured anterior pituitary cells in the turkey, although the physiological significance of this effect has been questioned (Proudman and Opel 1988;El Halawani et al 1992). AVT or AVP augment the release of prolactin in vivo in rats (Vaughan et al 1978;Kjaer et al 1991) and in vitro in rats (Vaughan et al 1975) and hamsters (Blask et al 1982). Moreover, passive immunization against AVP attenuates the suckling-induced increase of plasma prolactin in lactating rats (Nagy et al 1991).…”

“…Anatomical and physiological data suggest that AVT and, to a lesser extent, mesotocin may play similar hypophysiotropic functions in non-mammalian vertebrates (Mikami and Yamada 1984;Tennyson et al 1985;Tonon et al 1986;Robinzon et al 1988;Castro et al 1988;Moons et al 1988;Baker et al 1996;Romero et al 1998;Romero and Wingfield 2001). One of the most documented hypophysiotropic functions of AVP/AVT is the stimulation of adrenocorticotropic hormone (ACTH) release from corticotropes during stress responses (Rivier and Vale activity in rats (Lumpkin et al 1987;Childs et al 1989;Liu and Ben-Jonathan 1994) and regulate secretion of luteinizing hormone (LH) from gonadotropes in hamsters and rats (Blask et al 1982;Ono et al 1985;Evans and Catt 1989).…”

Neuroendocrine Effects of Light Deprivation and Pinealectomy in vivo on the Time Course of Changes in Prolactin Cell Activity in vitro

“…Other studies have shown that pituitaries from blinded male hamsters secrete 60% less immunoreactive PRL in vitro than glands from intact, long photoperiod-exposed controls [6). Similarly, PRL released by pituitaries from male hamsters maintained on short days for 11 weeks is re duced by 75% when compared to that by glands from long photoperiod-exposed controls [36].…”

Immunohistochemical characterization of chicken pituitary cells containing the vasotocin VT2 receptor

“…As mentioned earlier, studies in mammalian species have documented gonadotropin-releasing effects of AVP and oxytocin in rats and hamsters (Blask et al 1982;Ono et al 1985;Evans and Catt 1989). AVP also elicits a dose-dependent increase in TSH release from rat pituitary cells (Lumpkin et al 1987), whereas oxytocin has an inhibitory effect on growth hormone release under basal conditions (Franci et al 1993).…”

“…AVT stimulates prolactin release from cultured anterior pituitary cells in the turkey, although the physiological significance of this effect has been questioned (Proudman and Opel 1988;El Halawani et al 1992). AVT or AVP augment the release of prolactin in vivo in rats (Vaughan et al 1978;Kjaer et al 1991) and in vitro in rats (Vaughan et al 1975) and hamsters (Blask et al 1982). Moreover, passive immunization against AVP attenuates the suckling-induced increase of plasma prolactin in lactating rats (Nagy et al 1991).…”

“…Anatomical and physiological data suggest that AVT and, to a lesser extent, mesotocin may play similar hypophysiotropic functions in non-mammalian vertebrates (Mikami and Yamada 1984;Tennyson et al 1985;Tonon et al 1986;Robinzon et al 1988;Castro et al 1988;Moons et al 1988;Baker et al 1996;Romero et al 1998;Romero and Wingfield 2001). One of the most documented hypophysiotropic functions of AVP/AVT is the stimulation of adrenocorticotropic hormone (ACTH) release from corticotropes during stress responses (Rivier and Vale activity in rats (Lumpkin et al 1987;Childs et al 1989;Liu and Ben-Jonathan 1994) and regulate secretion of luteinizing hormone (LH) from gonadotropes in hamsters and rats (Blask et al 1982;Ono et al 1985;Evans and Catt 1989).…”