Enhancement of [3H]clonidine binding to rat cerebral synaptic membranes by treatment with arachidonic acid, prostaglandin (PG) D2, PGE2 and PGF2 alpha.
نویسندگان
چکیده
Pretreatment of cerebral synaptic membranes with arachidonic acid (10 nM-1 microM) at 37 degrees C for 40 min caused a significant increase in [3H]clonidine binding but pretreatment at 4 degrees C did not. Scatchard analysis showed that 100 nM arachidonic acid pretreatment resulted in a significant elevation of the Bmax value of the low affinity site. PGD2, PGE2 and PGF2 alpha (10-100 microM) pretreatment also enhanced binding. These polyunsaturated fatty acids could be involved in regulation of the alpha 2-adrenoceptor binding in rat cerebral cortical membranes.
منابع مشابه
Modulation of keratinocyte proliferation in vitro by endogenous prostaglandin synthesis.
To understand the relationship between the proliferation of epidermis and its arachidonic acid metabolism, we studied human keratinocytes grown in vitro at confluent or nonconfluent densities. Keratinocyte cultures incubated with [14C]arachidonic acid synthesized prostaglandin (PG)E2 PGD2, PGF2 alpha, and small quantities of 6-keto-F1 alpha. Nonconfluent cultures, however, synthesized fourfold ...
متن کاملStructural specificity for prostaglandin effects on hepatocyte glycogenolysis.
Prostaglandins (PGs) are known to have effects on hepatic glucose metabolism. Some actions of PGs in intact liver systems may not involve PG effects directly at the level of the hepatocyte. To define the ability of structurally distinct prostaglandins to affect hepatocyte metabolism directly, the regulation of glycogenolysis was studied in hepatocytes isolated from male Sprague-Dawley rats. PGF...
متن کاملModulation of eicosanoid-induced contraction of mouse and rat blood vessels by gingerols.
The effects of the active principles of crude ginger (a traditional Sino-Japanese medicine), the gingerols, on the contractile responses to eicosanoids were compared using isolated mouse and rat blood vessels. Leukotrienes (LT) C4 and D4, a thromboxane (TX) A2 derivative (U-46619), prostaglandins (PG) F2 alpha, PGI2-Na, PGE2, the stable PGI2 derivative TRK-100, and PGD2 induced contraction in l...
متن کاملDecrease of prostaglandin E2 receptor binding is accompanied by reduced antilipolytic effects of prostaglandin E2 in isolated rat adipocytes.
The effect of treatment of isolated rat adipocytes with prostaglandin E2 (PGE2) on subsequent [3H]PGE2 binding was studied. In addition, the antilipolytic effects of was studied. In addition, the antilipolytic effects of PGE2, adenosine, and insulin were studied in control and PGE2-treated adipocytes. Treatment of adipocytes with PGE2 (1 microM) decreased the binding of [3H]PGE2 by 61% (from 11...
متن کاملPreferential binding of growth inhibitory prostaglandins by the target protein of a carcinogen.
Liver fatty acid binding protein (L-FABP) is the principal target protein of the hepatic carcinogen N-(2-fluorenyl)acetamide (2-acetylaminofluorene) in rat liver. In addition, the cyclopentenone prostaglandins (PG), PGA, PGJ2, and delta 12-PGJ2, inhibit the growth of many cell types in vitro. This report describes the preferential binding of the growth inhibitory prostaglandins by L-FABP and th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Japanese journal of pharmacology
دوره 42 2 شماره
صفحات -
تاریخ انتشار 1986