Defect of calmodulin-binding protein in expression of interleukin-1 beta gene by LPS-nonresponder C3H/HeJ mouse macrophages

Biochemical and Biophysical Research Communications
Y TeradaM Nakano

Abstract

Peritoneal macrophages of Lipopolysaccharide (LPS)-refractory C3H/HeJ mouse failed to express the mRNA coding interleukin 1 (IL-1) beta when stimulated by the Ca2+ ionophore A23187 or LPS, though macrophages of LPS-responsive C3H/He responded to these stimulants. These results suggest that the defect of the response in C3H/HeJ macrophages toward LPS stimulation may be related to the Ca2+-dependent signal pathway. The extracts from the C3H/HeJ macrophages showed normal activities of both protein kinase C (PKC) and calmodulin (CaM) in comparison with those from LPS-responsive C3H/He macrophages. However, one species of CaM-binding proteins could hardly be detected by the cross-linking assay with 125I-CaM in C3H/HeJ macrophages stimulated by LPS. These results suggest that the LPS-refractory site in C3H/HeJ macrophages is related to the lack of this CaM-binding protein, and the Ca2+-dependent CaM system may play an important role in the activation of cells by LPS.

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Feb 1, 1992·International Journal of Immunopharmacology·E K GallinM L Patchen
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