Binding and biological effects of insulin, insulin analogues and insulin-like growth factors in rat aortic smooth muscle cells. Comparison of maximal growth promoting activities

Diabetologia. 1991 May;34(5):307-13. doi: 10.1007/BF00405001.


Binding and growth promoting effects of insulin, insulin analogues modified in the B chain, proinsulin, insulin-like growth factor-I and -II were studied in cultured rat aortic smooth muscle cells. Specific binding of 125I-insulin was 0.9 +/- 0.2% of total 125I-insulin added, and the IC50-value was estimated to 8.9 pmol/l. The insulin analogue B10 Asp tended to be more potent than insulin in displacing 125I-insulin, B28 Asp was equipotent, B9 Asp/B27 Glu was approximately 100 times less potent and insulin-like growth factor-I more than 1000 times less potent than insulin. Specific binding of 125I-insulin-like growth factor-I after 4 h incubation at 10 degrees C was five times higher than the specific binding of insulin (4.4 +/- 0.4% of total 125I-insulin-like growth factor-I added), and the IC50-value was 0.3 nmol/l. Insulin was approximately 500 times less potent than insulin-like growth factor-I in displacing 125I-insulin-like growth factor-I. The insulin analogue B10 Asp was slightly more potent and analogue B28 Asp was equipotent with insulin. Analogue B9 Asp/B27 Glu was ten times less potent and proinsulin was more than ten times less potent than insulin. The order of potency was similar for 3H-thymidine incorporation into DNA: insulin-like growth factor-I greater than B10 Asp greater than insulin-like growth factor-II greater than insulin greater than or equal to B28 Asp greater than B9 Asp/B27 Glu greater than proinsulin. The maximal effect of insulin-like growth factor-I on 3H-thymidine incorporation was 71 +/- 16% higher than the maximal effect of insulin.(ABSTRACT TRUNCATED AT 250 WORDS)

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Aorta / cytology
  • Aorta / drug effects
  • Aorta / metabolism*
  • Autoradiography
  • Binding, Competitive
  • Carrier Proteins / metabolism*
  • Cell Division / drug effects*
  • Cells, Cultured
  • DNA Replication / drug effects*
  • Insulin / analogs & derivatives*
  • Insulin / metabolism*
  • Insulin / pharmacology
  • Insulin-Like Growth Factor Binding Proteins
  • Insulin-Like Growth Factor I / metabolism*
  • Insulin-Like Growth Factor I / pharmacology
  • Insulin-Like Growth Factor II / metabolism*
  • Insulin-Like Growth Factor II / pharmacology
  • Kinetics
  • Mitotic Index
  • Muscle, Smooth, Vascular / cytology
  • Muscle, Smooth, Vascular / drug effects
  • Muscle, Smooth, Vascular / metabolism*
  • Rats
  • Receptor, Insulin / drug effects
  • Receptor, Insulin / metabolism*
  • Recombinant Proteins / metabolism
  • Recombinant Proteins / pharmacology
  • Thymidine / metabolism
  • Tritium


  • Carrier Proteins
  • Insulin
  • Insulin-Like Growth Factor Binding Proteins
  • Recombinant Proteins
  • Tritium
  • Insulin-Like Growth Factor I
  • Insulin-Like Growth Factor II
  • Receptor, Insulin
  • Thymidine