Insulin binding and internalization in hagfish red blood cells.
Binding of porcine 125I-insulin (0.15 nM) to hagfish red blood cells was time-dependent, reaching equilibrium after 1 hr at 10 degrees. The specific 125I-insulin binding to hagfish red blood cells was reversible, and unlabeled insulin accelerated the dissociation of 125I-insulin bound to receptors from a T1/2 of 60 min in cells suspended in medium alone to 23 min in medium containing 8 microM nonradioactive insulin. Porcine insulin and desoctapeptide insulin competed for specific binding of 125I-insulin in a dose-dependent manner, whereas glucagon and somatostatin did not. For porcine insulin, Scatchard analysis produced a curvilinear plot, suggesting multiple affinity binding sites with high-affinity and low-affinity association constants (Ka) 0.2 x 10(9) M-1 and 0.27 x 10(7) M-1, respectively. A total of 2090 binding sites per hagfish red blood cell was calculated. Sixty-two percent of the bound 125I-insulin was found to be internalized into the hagfish red blood cells. Less degradation of 125I-insulin was observed by Sephadex G-50 chromatography compared to human red blood cells.
Department of Medicine, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
C S
CS
Cockram
S K
SK
Ho
S Q
SQ
Zhu
J D
JD
Young
D000818:Animals; D004705:Endocytosis / Q000502:physiology; D004912:Erythrocytes / Q000378:metabolism*; D006196:Hagfishes / Q000097:blood*; D006801:Humans; D007328:Insulin / Q000097:blood*; D008297:Male; D011972:Receptor, Insulin / Q000378:metabolism; D012016:Reference Values; D013045:Species Specificity; D013552:Swine
D007328:Insulin; D011972:Receptor, Insulin