ABSTRACT
AIM To investigate the tissue distribution of exendin-4 after administration in healthy rats. METHODS Exendin-4 was radioiodinated by the Iodo-GenTMmethod. Tissue distribution of [125I]exendin-4 was investigated after sc administration of [125I]exendin-4 at 3 μg·kg-1 in rats. Both total radioactivity and trichloroacetic acid (TCA) precipitated radioactivity were used to calculate the levels of [125I]exendin-4 in rats plasma and tissue samples after sc administration. RESULTS The tissue distribution of [125I]exendin-4 after sc injection showed substantial disposition in kidneys, lungs, bladder and pancreas. The rank order of normalized tissue distribution was kidneys＞lungs＞bladder＞pancreas＞intestine＞plasma＞adrenals>jejunum＞lymph＞liver＞spleen＞heart＞marrow＞thymus＞testicles＞brain＞muscle＞adipose. CONCLUSION [125I]Exendin-4 underwent a rapid and wide distribution in the tissues throughout the whole body within the time course examined. TCA precipitated radioactivity in kidneys was the highest, however, only trace amounts of [125I]exendin-4 was detected in the brain.
ABSTRACT
Urinary excretion of prostaglandin E2. (PGE2) and thromboxane B2 (TXB2, a stable metabolite of TXA2), atrial natriuretic peptide (ANP) and arginine vasopressin (AVP) in plasma were determined with radioimmunoassay in 30 healthy normal controls (NC) and 53 cirrhotic patients without asoites (n = 18), with ascites (n = 25) and with hepatorenal syndrome (HRS, n=10). All of four vasoactive substances in the group of cirrhotic patients without ascites were significantly higher than that in NG (P