Insulin receptor expression in the burkitt lymphoma cells daudi and raji

Abstract

The specific binding of insulin to either intact or Triton-solubilized Daudi cells (a Burkitt lymphoma cell line) was reduced by over 95% compared to that to control IM-9 lymphocytes due to a decrease in receptor number without a change in affinity. Analysis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and autoradiography revealed that 125l-labeled Daudi cells had reduced amounts (~1/20th) of immunoprecipitable binding (α) subunit [mol wt (Mr), 130,000] of the receptor and a relatively abundant 210,000 Mr form not seen in IM-9 cells. The transmembranous (β) subunit (Mr, 90,000) of the receptor, although not detected by125l surface labeling, could be phosphorylated and, togeth..