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. 1988 Aug;85(15):5649–5653. doi: 10.1073/pnas.85.15.5649

Expression of membrane interleukin 1 by fibroblasts transfected with murine pro-interleukin 1 alpha cDNA.

R C Fuhlbrigge 1, S M Fine 1, E R Unanue 1, D D Chaplin 1
PMCID: PMC281817  PMID: 3261013

Abstract

Studies of interleukin 1 (IL-1) alpha and beta have emphasized their functional similarities. IL-1 alpha and -beta are encoded by ancestrally related genes that have diverged dramatically in primary sequence; however, only modest differences in the regulation or biological activity of IL-1 alpha and IL-1 beta have been documented. Here we show that mouse L cells transfected with murine pro-IL-1 alpha cDNA expressed biologically active, 33-kilodalton pro-IL-1 alpha, and that this pro molecule was neither processed to the 17-kilodalton mature form nor secreted. The transfected cells also expressed membrane-associated IL-1 biological activity, indicating that the pro-IL-1 alpha cDNA can direct expression of membrane-associated IL-1 and that cleavage of the pro molecule is not required for membrane presentation. In contrast, transfection of pro-IL-1 beta cDNA did not generate biologically active material in L cells. Evidence is presented that the native murine IL-1 beta precursor molecule is also biologically inactive in peritoneal exudate cells stimulated with lipopolysaccharide. These differences in distribution of the bioactive forms of IL-1 alpha and IL-1 beta may provide selective advantages for the maintenance of two gene products with similar functions.

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Selected References

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