TY - JOUR
T1 - Direct effect of insulin on the synthesis of specific plasma proteins
T2 - Biphasic response of hepatocytes cultured in serum- and hormone-free medium
AU - Liang, T. J.
AU - Grieninger, G.
PY - 1981
Y1 - 1981
N2 - Monolayers of chicken embryo hepatocytes, cultured in chemically defined medium, retain the ability to synthesize a wide spectrum of plasma proteins for several days in the absence of added hormones. Addition of insulin to the medium elicited a biphasic stimulation of plasma protein synthesis: a rapid response of the synthesis of a limited number of plasma proteins (e.g., albumin and α1-globulin 'M'), then, after prolonged exposure to the hormone, the involvement of additional plasma proteins (e.g., fibrinogen and lipoproteins). Synthesis of transferrin and a few other plasma proteins was not affected by the presence of insulin. The degree of stimulation for the most responsive plasma proteins ranged between 2- to 4-fold during the early phase and 10- and even 30-fold during the late phase of the cells' response to insulin. Stimulated synthesis in the early phase was detected within 1 hr and was rapidly reversible. Plasma protein synthesis in culture was sensitive to concentrations of insulin below 0.35 nM, well within the physiological range. The delayed response was elicited only at higher hormone levels. Parallels between the control of synthesis of plasma proteins in this system and that observed in diabetic animals suggest that the embryonic chicken hepatocytes may be a useful model for studying liver function in diabetes as well as insulin action in general.
AB - Monolayers of chicken embryo hepatocytes, cultured in chemically defined medium, retain the ability to synthesize a wide spectrum of plasma proteins for several days in the absence of added hormones. Addition of insulin to the medium elicited a biphasic stimulation of plasma protein synthesis: a rapid response of the synthesis of a limited number of plasma proteins (e.g., albumin and α1-globulin 'M'), then, after prolonged exposure to the hormone, the involvement of additional plasma proteins (e.g., fibrinogen and lipoproteins). Synthesis of transferrin and a few other plasma proteins was not affected by the presence of insulin. The degree of stimulation for the most responsive plasma proteins ranged between 2- to 4-fold during the early phase and 10- and even 30-fold during the late phase of the cells' response to insulin. Stimulated synthesis in the early phase was detected within 1 hr and was rapidly reversible. Plasma protein synthesis in culture was sensitive to concentrations of insulin below 0.35 nM, well within the physiological range. The delayed response was elicited only at higher hormone levels. Parallels between the control of synthesis of plasma proteins in this system and that observed in diabetic animals suggest that the embryonic chicken hepatocytes may be a useful model for studying liver function in diabetes as well as insulin action in general.
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M3 - Article
C2 - 7031664
AN - SCOPUS:0019869792
SN - 0027-8424
VL - 78
SP - 6972
EP - 6976
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 11 II
ER -