[Regulation of the adenylate cyclase system of lymphocytes in patients with therapy-resistant arterial hypertension and during PGE2 administration]. / Reguliatsiia adenilattsiklaznoi sistemy limfotsitov u bol'nykh arterial'noi gipertoniei, refrakternoi k terapii, pri vvedenii pge2.

The effects of prostaglandin E2 (PGE2) infusions on lymphocyte beta 2-adrenoceptor-dependent adenylate cyclase (beta 2ARAC) system were studied in 26 patients with resistant hypertension (RH). The density of beta 2-adrenoceptors and their affinity for 1-isoproterenol were measured with 125ICYP and adenylate cyclase activity was determined by alpha-[32P]AMP generation in mononuclear lymphocytes of RH patients before and 1, 7, and 14 days after the last PGE2 infusion. Plasma epinephrine and norepinephrine concentrations were analyzed by using HPLC. The resistance to the four-component drug therapy was overcome with PGE2 infusions in patients, leading to a decrease in lymphocyte beta 2-adrenoceptor density and an increase in beta 2-receptor affinity for catecholamines and in adenylate cyclase activation by stimulating agents. PGE2 infusions unchanged the sensitivity to antihypertensive drugs in patients resulting in an increase in lymphocyte beta 2-adrenoceptor density, a decrease in beta 2-receptor affinity for catecholamines and in adenylate cyclase activation.

[Changes in the characteristics of the lymphocyte beta 2-adrenoreceptors under the influence of prostaglandin E2 infusions in hypertension patients]. / Izmenenie pod vliianiem infuzii prostaglandina E2 kharakteristik beta 2-adrenoretseptorov limfotsitov u bol'nykh gipertonicheskoi bolezn'iu.

Lymphocyte beta 2-adrenoreceptor density and affinity for catecholamines (CA) were examined in 22 patients with essential hypertension (EH) which was resistant to therapy. Lymphocyte beta 2-adrenoreceptor density was 1.5 times more in EH patients than in normotensive donors, but the receptor affinity for CA was the same. Prostaglandin E2 infusions permitted the resistance to antihypertensive therapy be overcome in 17 patients; it was accompanied by a decrease in of lymphocyte beta 2-adrenoreceptor density, receptor's affinity for 1-isoproterenol showed a 7-fold increase. There was no steady antihypertensive effect on prostaglandin E2 infusions in 5 EH patients: in these cases lymphocyte beta 2-adrenoreceptor density increased and their affinity for CA decreased.