The murine antiapoptotic protein A1 is induced in inflammatory macrophages and constitutively expressed in neutrophils

Amos Orlofsky, Robert D. Somogyi, Louis M. Weiss, Michael B. Prystowsky

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Myeloid leukocytes are thought to regulate their susceptibility to apoptosis upon migration to a site of inflammation. However, factors that determine survival have not been well characterized in these cells. We have examined the expression of murine A1, an antiapoptotic Bcl-2 relative found in activated myeloid cells, during the course of an acute inflammatory response. Intraperitoneal infection of mice with the virulent RH strain of Toxoplasma gondii led to a 5- to 10-fold increase in A1 mRNA levels in peritoneal cells after several days. Bcl-2 expression was unchanged. The increase in A1 expression depended on the dose of the organism and coincided with a sharp increase in peritoneal cellularity. A1 protein levels were also increased as determined by Western blot analysis and immunohistochemical studies. All neutrophils and approximately half of the macrophages in the inflammatory exudate contained high levels of A1 in cytoplasm. A1 expression did not correlate with intracellular parasitization. Peripheral blood neutrophils from normal mice strongly expressed A1 protein, whereas normal monocytes showed only weak staining. Bax mRNA was induced in parallel with A1 in macrophages. Exudate macrophages and granulocytes that were apoptotic by TUNEL staining occasionally appeared to display A1 throughout the cell nucleus. These studies identify A1 as a potential regulator of apoptosis during acute inflammation.

Original languageEnglish (US)
Pages (from-to)412-419
Number of pages8
JournalJournal of Immunology
Volume163
Issue number1
StatePublished - Jul 1 1999

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Neutrophils
Macrophages
Exudates and Transudates
Apoptosis
Staining and Labeling
Inflammation
Messenger RNA
Proteins
Toxoplasma
In Situ Nick-End Labeling
Myeloid Cells
Cell Nucleus
Granulocytes
Monocytes
Cytoplasm
Leukocytes
Western Blotting
Infection

ASJC Scopus subject areas

  • Immunology

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The murine antiapoptotic protein A1 is induced in inflammatory macrophages and constitutively expressed in neutrophils. / Orlofsky, Amos; Somogyi, Robert D.; Weiss, Louis M.; Prystowsky, Michael B.

In: Journal of Immunology, Vol. 163, No. 1, 01.07.1999, p. 412-419.

Research output: Contribution to journalArticle

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