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Vasopressinergic innervation of the pig pineal gland.
Folia Histochem. Cytobiol. 2002: 40 (1) s.3-8, il., bibliogr. 30 poz.
Hasła klasyfikacyjne GBL:
An immunohistochemical study of the pineal gland of the domestic pig was carried out using the antisera raised against vasopressin (VP). The pineal glands were taken from the newborn, 21-day- and 7-month old female pigs. The pig pineal glands is moderately innervated by VP-immunoreactive nerve fibers. They run from the habenular commissure into the connective tissue septa and further into the pineal parenchyma. In the subependymal tissue as well as in the connective tissue septa, the fibres are smooth or with small varicosities and in the parenchyma with large ones. The obtained results point to extrapineal and extraepithalamic source of the fibres. The density of VP-immunoreactive fibers in the pineal gland of 7-month old pigs is higher than in the younger animals.
Influence of 4-day long treatment with vasoactive intestinal peptide on ultrastructure and function of the rat pinealocytes in organ culture.
Folia Histochem. Cytobiol. 2002: 40 (1) s.9-16, il., bibliogr. 35 poz.
Hasła klasyfikacyjne GBL:
Vasoactive intestinal peptide (VIP) is one neuropeptides involved in the regulation of the pineal gland function. The acute treatment of rat pinealocytes with VIP caused in their biochemical parameters. The present study concerns the effects of the chronic treatment with VIP on ultrastructure and function of the rat pinealocytes in organ culture. The pineals of adult male rats were assigned to one of three groups and placed in organ culture for four consecutive days. The pineals of the first group were incubated in the control medium, the pineals of the second group - 12 hrs in control medium and 12 hrs in medium with 1 ćM VIP (between 20.00 and 8.00) during each day, the pineals of the third group - 24 hrs per day in medium with 1 ćM VIP. The melatonin concentration was measured using RIA and activity of enzymes using radiochemical methods. Point count method was used in quantitative ultrastructural analysis. Both modes of chronic treatment with VIP increased significantly the level of melatonin secretion during four days of the culture and the content of this hormone in the pineal explants at the end of the experiment. Treatment with the neuropeptide for 12 hrs and 24 hrs per day elevated also the activity of arylalkylamine N-acetyltransferase and hydroxyindole=O-methyltransferase. On the other hand. VIP had no effect on the activity of arylamine-N-acetyltransferase. VIP increased the relative volume of rough endoplasmic reticulum. Golgi apparatus and mitochondria and did not influence the relative volume of lysosomes and lipid droplets as well as the numerical...
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