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Klin Wochenschr. 1977 Oct 15;55(20):1013-8.
[Raised plasma-prolactin levels in essential hypertension: index of reduced hypothalamic dopaminergic activity (author's transl)]

[Article in German]

Kolloch R, Stumpe KO, Higuchi M, Vetter H, Kruck F.

Serial measurements of plasma-prolactin concentration (HPr) and plasma-renin activity (PRA) at 30-min intervals were made in 19 male patients with essential hypertension and in 8 normotensive subjects. HPr was markedly higher in the hypertensive patients than in the normotensive controls. Patients with reduced plasma-renin activity and only slightly elevated HPr-levels showed lower urinary sodium excretion, but a more pronouced 24-h natriuretic response to i.v. furosemide than patients with normal renin and very high HPr-levels. Six patients were treated with the dopaminergic agonist bromocriptine. The drug induced a significant blood pressure reduction in five patients and normalised pressure in two patients. The data do not indicate a role for prolactin in sustaining hypertension via renal salt retaining mechanisms. It is suggested that the raised HPr-levels represent an index of altered central nervous function, characterized by reduced hypothalamic activity. The blood pressure-lowering effect of the dopaminergic agonist bromocriptine fits with the hypothesis that reduced hypothalamic dopaminergic activity might be a factor in the pathogenesis of essential hypertension.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=926711&dopt=Abstract

J Pharmacol Exp Ther. 1992 Aug;262(2):734-40.
AHN 683: a fluorescent ligand for peripheral-type benzodiazepine receptors.

McCabe RT, Newman AH, Skolnick P.

Laboratory of Neuroscience, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland.

AHN 683 [1-(2-fluoro-5-N[1,3-dihydrol-1,1-bis(4-hydroxyphenyl)-3-oxo- 5-isobenzofurancarboxamide]-phenyl)-N-methyl-N-(1-methylpropyl)-3- isoquinoline carboxamide] is a fluorescein-derived ligand at peripheral-type benzodiazepine receptors structurally related to the isoquinoline carboxamide, PK 14105. The binding of AHN 683 to rat renal membranes measured by fluorescence techniques was saturable with a maximum number of binding sites of 2.3 +/- 0.3 pmol/mg of protein. The KD (40.4 +/- 2.2 nM) estimated by fluorescence was in good agreement with the Ki (77.4 +/- 13.5 nM) obtained in competition studies with [3H] Ro 5-4864. AHN 683 exhibited rapid and reversible binding which was significantly reduced by the histidine modifying reagent, diethylpyrocarbonate. The potencies of a pair of isoquinoline carboxamide enantiomers as well as other structurally diverse peripheral-type benzodiazepine receptor ligands estimated by inhibition of AHN 683 binding were in good agreement with values obtained using radioligand binding techniques. AHN 683 binding was unaffected by compounds that do not recognize peripheral-type benzodiazepine receptors. Moreover, a significant increase in the maximum number of binding sites of AHN 683 to rat renal membranes after chronic furosemide treatment (29.2%, P less than .02) was comparable to the increase measured using [3H]PK 11195 (35.6%, P less than .001). These findings demonstrate the feasibility of using fluorescent ligand binding techniques to quantitatively characterize peripheral-type benzodiazepine receptors.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1323661&dopt=Abstract

Cardiovasc Res. 1999 Dec;44(3):623-31.
Involvement of myosin light-chain kinase in chloride-sensitive Ca2+ influx in porcine aortic endothelial cells.

Tran QK, Watanabe H, Zhang XX, Takahashi R, Ohno R.

Department of Internal Medicine III, Hamamatsu University School of Medicine, Japan.

OBJECTIVES: This study was designed to investigate the involvement of myosin light-chain kinase (MLCK) in bradykinin- and thapsigargin-induced changes in intracellular Cl- and Ca2+ concentrations ([Cl-]i; [Ca2+]i) in porcine aortic endothelial cells. METHODS: Using the fluorescent probes N-ethoxycarbonylmethyl-6-methoxyquinolinium bromide (MQAE) and fura-2/AM, the effects of different MLCK inhibitors on bradykinin- and thapsigargin-induced changes in [Cl-]i and [Ca2+]i were assessed. RESULTS: Bradykinin and thapsigargin significantly decreased the MQAE fluorescence intensity, which indicates increased [Cl-]i; these changes were reversed by removal of extracellular chloride (Cl-o) and were significantly inhibited by Cl(-)-channel inhibitor N-phenylanthranilic acid but not by Na(+)-K(+)-Cl- cotransport inhibitor furosemide. Pretreatment with ML-9 and wortmannin, two different selective inhibitors of MLCK, significantly reduced these changes in a dose-dependent manner. The inhibitory effects of ML-9 and wortmannin on the Cl- responses were not significantly different and were not additive. Bradykinin and thapsigargin provoked large increases in [Ca2+]i, which were significantly diminished by removal of Cl-o and by pretreatment with the Cl(-)-channel inhibitor N-phenylanthranilic acid. CONCLUSIONS: The study shows that an increase in [Cl-]i may be involved in the Ca2+ influx in response to bradykinin and thapsigargin and that MLCK might be involved in the Cl- response. We suggest that MLCK might be involved in the Cl(-)-sensitive endothelial Ca2+ responses to bradykinin and thapsigargin.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10690296&dopt=Abstract

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