Biosynthesis of 10 kDa and 7.5 kDa insulin-like growth factor II in a human rhabdomyosarcoma cell line

1993 ◽  
Vol 93 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Finn C. Nielsen ◽  
Gisela Haselbacher ◽  
Jan Christiansen ◽  
Mats Lake ◽  
Mette Grønborg ◽  
...  
Endocrinology ◽  
1992 ◽  
Vol 130 (6) ◽  
pp. 3669-3676 ◽  
Author(s):  
K Matsumoto ◽  
C Gaetano ◽  
W H Daughaday ◽  
C J Thiele

Diabetologia ◽  
1995 ◽  
Vol 38 (8) ◽  
pp. 927-935
Author(s):  
M. Asfari ◽  
W. De ◽  
M. N�el ◽  
P. E. Holthuizen ◽  
P. Czernichow

1984 ◽  
Vol 4 (12) ◽  
pp. 1071-1077 ◽  
Author(s):  
Michael Tally ◽  
Tang Xin-Zhi ◽  
Gösta Enberg ◽  
Kerstin Hall

The erythroleukemia cell line K562 was previously shown to have specific binding sites for insulin but not for insulin-like growth factor I (IGF-I). In this study the presence of specific receptors for insulin-like growth factor II (IGFqI) is established. Scatchard analysis of the competition curve for IGF-II disclosed a non-cooperative binding kinetic with a calculated affinity constant of 2.4 × 108 M−1 and a receptor number of 4.8 × 104 sites/cell. IGF-I displayed 10% crossreactivity over the IGF-II receptor but insulin did not crossreact at all. Instead insulin, present in high concentrations, enhanced the binding of IGF-II. The presence of IGF II but not IGF-I receptors makes the K562 cell line suitable for studying properties of the type-2 receptor.


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