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Clin Exp Pharmacol Physiol. 2000 Jan-Feb;27(1-2):80-7.
Inhibition of kinin degradation on the luminal side of renal tubules reduces high blood pressure in deoxycorticosterone acetate salt-treated rats.

Nakajima S, Ito H, Hayashi I, Kuribayashi Y, Okumura T, Yajima Y, Katori M, Majima M.

Department of Internal Medicine, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan.

1. To determine whether the antihypertensive response in deoxycorticosterone acetate (DOCA) salt-treated rats was mediated by kinins on the luminal side of renal tubules or in the circulation, selective urinary kininase inhibitors were administered to normal Brown Norway Kitasato (BN-Ki) rats and kininogen-deficient Brown Norway Katholiek (BN-Ka) rats. 2. Kinins were degraded by neutral endopeptidase (NEP) and carboxypeptidase Y-like kininase (CPY) in urine, but were inactivated mainly by angiotensin-converting enzyme (ACE) in the plasma. 3. Ebelactone B inhibited CPY, while poststatin inhibited CPY and NEP. 4. Daily administration of poststatin (5 mg/kg per day, s.c.) for 3 days reduced blood pressure (BP) in DOCA salt-treated BN-Ki rats, but not in BN-Ka rats. 5. Ebelactone B (5 mg/kg per day, s.c.) also reduced BP in BN-Ki rats, which was accompanied by increased urinary sodium excretion, but had no effect on BP in BN-Ka rats. 6. Lisinopril (5 mg/kg per day, s.c.) had no effect on BP in either rat strain. 7. Arterial kinin levels in BN-Ki rats increased significantly (2.2-4.6 pg/mL) with captopril (10 mg/kg, s.c.). However, arterial kinin levels that induced hypotension following the infusion of bradykinin (1000 ng/kg per min, i.v.) were 110-fold higher than endogenous arterial kinin levels attained following captopril. 8. These results suggest that inhibition of kinin degradation on the luminal side of the renal tubules may effectively attenuate hypertension.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10696533&dopt=Abstract

J Hypertens. 1983 Jun;1(1):57-63.
Effect of DOCA-salt on angiotensin dependency and surgical reversal of hypertension in two-kidney, one clip renal hypertensive rats.

Takata Y, Doyle AE.

The development of hypertension in two-kidney, one clip renal hypertensive rats (2K, 1C RHR) was not altered by treatment with DOCA and saline solution as drinking fluid for two months of observation. However, the administration of DOCA and salt suppressed plasma renin activity (PRA), the renal renin content (RRC) of the clipped kidney and the response to a single oral dose of captopril (10 mg/kg). The weight of the contralateral kidney was increased by the administration of DOCA-salt, while that of the ischaemic kidney was not changed. The withdrawal of DOCA-salt treatment restored the PRA and the effects of captopril to a similar degree to the non-treated group. The acute hypotensive effects of captopril were reduced on the 10th week compared with the 7th week after renal arterial constriction in 2K, 1C RHR. The fall in blood pressure induced by captopril significantly correlated with the initial PRA both in the 7th and 10th week after clipping. There was a significant correlation between PRA and RRC of the clipped kidney. Rats previously treated with DOC-salt had either removal of the contralateral kidney with removal of the clip from the ischaemic kidney, or removal of the ischaemic kidney. Blood pressure fell to normal levels in the unclipped group and in the nephrectomy group, but the fall in the latter group was transient and within two weeks had risen to significantly higher levels than in the unclipped group. It is concluded that structural vascular change following DOC-salt hypertension is insufficient to cause persisting hypertension except when it occurs in the renal circulation.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6397514&dopt=Abstract

mcw.edu

Fibrosis of the renal interstitium is well correlated with kidney function and a greater extent of fibrosis predicts renal failure. Recent work has shown striking fibrotic constrictions at the glomerulotubular neck in porcine radiation nephropathy and in Wegener's granulomatosis in man. The present studies were designed to identify stenotic necks in a third species and to evaluate the effect of captopril treatment. Experimental radiation nephropathy was established with 17 Gy total body irradiation of barrier-maintained rats. Kidneys were obtained at 99 and 203 days for histology, using perfusion fixation. There was renal injury, with a rise in BUN, as expected, which was attenuated by captopril treatment. There was stenotic neck formation at 99 and 203 days. Captopril did not influence the absolute fraction of necks that were stenotic but it did prevent the evolution of glomeruli with necks to atubular glomeruli. It is concluded that stenosis of the glomerulotubular neck is a general phenomenon of any scarring kidney disease; that stenotic necks are probably an intermediate step in the evolution towards atubular glomeruli; and that timely use of captopril may prevent the progression of a stenotic neck towards an atubular glomerulus. Copyright 2000 John Wiley & Sons, Ltd.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10699999&dopt=Abstract

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