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. 1997 Nov;25(1-3):127–135. doi: 10.1023/A:1007995212658

Concanamycin A, a vacuolar type H+-ATPase inhibitor, induces cell death in activated CD8+ CTL

Ken-ichi Togashi, Takao Kataoka, Kazuo Nagai
PMCID: PMC3466736  PMID: 22358885

Abstract

Concanamycin A (CMA) and concanamycin B (CMB) are specific inhibitors of vacuolar type H+-ATPase (V-ATPase). In our previous studies, intraperitoneal injection of CMB was shown to suppress the increase in CD8+ CTL population, but not to affect CD4+ and B220+ populations, in mice immunized with allogeneic tumors. To clarify the molecular basis of the selective decrease in the CD8+ CTL population by CMB, we have performed a series of in vitro experiments with use of CMA. Cell viability of the CD8+ population prepared from the immunized mice was preferentially decreased by CMA treatment. Moreover, in the CD8+ CTL clone, CMA induced a marked DNA fragmentation and nuclear condensation characteristic of apoptosis. Anti-CD3 or phorbol ester accelerated the CMA-induced reduction in cell viability of the CD8+ CTL clone, but not CD4+ T cell clones. However, this rapid cell death was not accompanied by DNA fragmentation and nuclear condensation. Perforin and granzyme B were unlikely to be involved in such cell death. Thus, our data suggest that V-ATPase activity is essential for survival of CD8+ CTL especially when activated.

Keywords: apoptosis, CD8+T cell, cell death, concanamycin A

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