Abstract：
:A kininogenase resembling glandular kallikrein was partially purified from vascular tissue and characterized. Saline perfused rat tail arteries and veins were homogenized in 0.25 M sucrose containing 10 mM Tris-HCl (pH 7.4). The homogenate was centrifuged at 105,000 X g for 60 min and a vascular kininogenase was purified from the supernatant by chromatofocusing, affinity chromatography on immobilized antibodies against rat urinary kallikrein, and gel filtration on Sephadex G-100. The inhibitory effects of antibodies against rat urinary kallikrein were tested using equivalent kinin-forming concentrations of rat urinary kallikrein and vascular kininogenase. Kininogenase activities of both enzymes were similarly inhibited by urinary kallikrein antibodies. Aprotinin (1,000 KIU) completely inhibited vascular kininogenase activity while soybean trypsin inhibitor (100 micrograms) did not modify its kinin-forming activity. Vascular kininogenase and rat urinary kallikrein had the same elution volume when chromatographed on a Sephadex G-100 column and had similar mobilities in 10% polyacrylamide gel electrophoresis. Kinins released by vascular kininogenase were identified as bradykinin by reverse-phase high performance liquid chromatography. Rat vascular kininogenase appears to be similar to glandular kallikrein. Kinins released locally by vascular kininogenase may contribute to the regulation of vascular tone.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Nolly H,Scicli AG,Scicli G,Lama MC,Guercio AM,Carretero OAdoi
10.1007/978-1-4684-5143-6_2subject
Has Abstractpub_date
1986-01-01 00:00:00pages
11-7eissn
0065-2598issn
2214-8019journal_volume
198 Pt Apub_type
杂志文章abstract：:Pretreatment of rats with large doses of vitamin A (retinol) dramatically increased the hepatotoxicity of carbon tetrachloride (CCl4). Experiments were performed to elucidate the mechanism of this potentiation. Hypervitaminosis A was produced by oral administration of retinol, 250,000 IU/kg for seven days. CCl4 was th...
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