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Radioprotective efficacy of HT + AET in encapsulated form.
Indian J Exp Biol
May 1996
Radiation Biology Department, Institute of Nuclear Medicine & Allied Sciences, Delhi, India.
Entrapment of 5-hydroxyl-L-tryptophan (HT) in erythrocyte ghost prepared by hypotonic method and high voltage electric discharge method are nearly same. Release of HT with beta-aminoethylisothiuronium bromide hydrobromide (HT + AET) in in vitro system is rapid but only a portion of the entrapped amount is released. Release of HT + AET in serum marginally increases at 2 hr.
View Article and Find Full Text PDFThe effects of aminoethylisothiuronium bromide known as a radioprotector on the activity of human platelet soluble guanylate cyclase and on ADP-induced aggregation of human platelets have been studied. It has been shown that in Tris-buffer and at definite pH values aminoethylisothiuronium bromide is converted into mercaptoethylguanidine as a result of a transguanidine rearrangement. The latter contains in its molecule both guanidine and SH-groups which appear to be the donor and acceptor of nitric oxide, respectively.
View Article and Find Full Text PDFGuanidine thiol--a new activator of soluble guanylate cyclase with antihypertensive and antiaggregatory properties.
Biochem Mol Biol Int
July 1995
Institute of Biomedical Chemistry, Russian Academy of Medical Sciences, Moscow, Russia.
Effects of aminoethylisothiuronium bromide (AET), known as radioprotector, on human platelet soluble guanylate cyclase and on ADP-induced human platelets aggregation were studied. It was shown that AET - in Tris buffer and at certain pH values - is converted, via transguanidine rearrangement, to mercaptoethylguanidine. The latter contains in its molecule both the guanidine and SH groups which act as donor and acceptor of nitric oxide (NO), respectively.
View Article and Find Full Text PDFUse of hydroxylamine in improving radio protection of a combination of 5-hydroxy L-tryptophan and a thiol compound (AET) in small mammals.
Indian J Exp Biol
October 1993
Radiation Biology Division, Institute of Nuclear Medicine and Allied Sciences Lucknow Marg, Delhi, India.
Radioprotective effectiveness has been evaluated by 30 day survival studies and protection to bone-marrow cells in mice after radiation exposure and this has been further established by 24 hr deoxycytidine excretion in urine of rats following 5 Gy whole body gamma irradiation and protection to superoxide dismutase enzyme in marrow cells and red blood corpuscles. Radioprotective effectiveness as well as the duration of radioprotection have been improved by the administration (ip) of hydroxylamine (20 mg/kg), a decarboxylase inhibitor, prior to the use of a combination of 5-hydroxy L-tryptophan (5-HTP, 70 mg/kg) and 2-aminoethylisothiuronium bromide hydrobromide (AET, 20 mg/kg) ip in small mammals before whole body gamma irradiation.
View Article and Find Full Text PDFProtection to glycolysis by a combination of 5-hydroxy-L-tryptophan and 2-aminoethylisothiuronium bromide hydrobromide in lethally irradiated rats.
Indian J Exp Biol
September 1992
Radiation Biology Department, Institute of Nuclear Medicine & Allied Sciences, Delhi, India.
Rate of glycolysis in vivo at different time intervals following 8 Gy [LD100(30)] whole body gamma radiation (WBGR) was evaluated by estimating liver glycogen, blood sugar, serum lactic dehydrogenase (LDH) and blood lactic acid concentration in adult male Sprague Dawley rats. Within 1 hr of radiation exposure, a significant fall in liver glycogen was observed in rats fed food and water ad libitum. The glycogen content increased after 24 hr and had returned to control level on 7th day after radiation exposure.
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