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Inverse gene expression of prostacyclin and thromboxane synthases in resident and activated peritoneal macrophages 1
Author(s) -
Kuwamoto Shinsuke,
Inoue Hiroyasu,
Tone Yoshinori,
Izumi Yoshikazu,
Tanabe Tadashi
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)00516-4
Subject(s) - prostacyclin , thromboxane a synthase , gene expression , thromboxane , biology , northern blot , messenger rna , thromboxane a2 , microbiology and biotechnology , endocrinology , biochemistry , gene , immunology , platelet
Prostacyclin and thromboxane A 2 produced from prostaglandin H 2 are known to be important modulators with opposite biological activities. To examine possible roles of these prostanoids in immune responses, we have studied the gene expression of prostacyclin synthase (PGIS) and thromboxane synthase (TXS) in murine resident macrophages or in macrophages elicited with casein or bacillus Calmette‐Guérin (BCG). Northern blot analyses showed that the PGIS mRNA was expressed in a decreasing order in the resident, and casein‐ and BCG‐elicited macrophages. In contrast, the TXS mRNA was expressed in an increasing order in the resident, and casein‐ and BCG‐elicited macrophages. On the other hand, the mRNA for cyclooxygenase‐2, which produces PGH 2 and participates in the production of prostanoids in inflammation, was expressed in both the resident and BCG‐elicited macrophages but barely in the casein‐elicited cells. In situ hybridization analysis showed that the expression of mRNAs for PGIS and TXS was ascribable not only to the alteration of the expression levels of both mRNAs in the each macrophage but also to the changes in subpopulations of the cells expressing these mRNAs. These observations suggested that the inverse gene expression of PGIS and TXS in macrophages contributes to immune responses by modulating the relative levels of prostacyclin and thromboxane A 2 .