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第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

第117回日本解剖学会総会・全国学術集会 講演プログラム・抄録集 PDF ...

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AP1 GGA <br />

EGFR <br />

AP1 GGA2 <br />

EGFR GGA1 <br />

GGA3 <br />

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EGFR <br />

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A23187: f6 μM Zymosan <br />

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Involvement of Rab in phagosome formation through regulating<br />

ARF activity by ACAP<br />

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Phagosome formation and subsequent maturation are complex sequences of<br />

events that involve actin cytoskeleton remodeling and membrane trafficking. In<br />

our livecell studies, we found that Rab35 accumulated markedly at the membrane<br />

where IgG opsonized erythrocytes IgGEs are bound. Rab35 silencing by RNA<br />

interference or the expression of GDP or GTPlocked Rab35 mutant drastically<br />

reduced the rate of phagocytosis of IgGEs. Actinmediated pseudopod extension<br />

to form phagocytic cups was disturbed by the Rab35 silencing or the expression<br />

of GDPRab35, although initial actin assembly at the IgGE binding sites was<br />

not inhibited. Furthermore, GTPRab35dependent recruitment of ACAP2, an<br />

ARF6 GAP, was shown in the phagocytic cup formation. The ARF6 activation<br />

during FcγRmediated phagocytosis was severely impaired by expressing GTP<br />

bound mutant of Rab35. Concomitantly, overexpression of ACAP2 along with<br />

GTPlocked Rab35 showed a synergistic inhibitory effect on phagocytosis. Taken<br />

together, it is likely that Rab35 regulates actindependent phagosome formation<br />

by recruiting ACAP2, which might control actin remodeling through ARF6.<br />

P<br />

AtgAmRNA HeLa /A study on<br />

AtgAmRNAknockdown HeLa cells<br />

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Atg9A 9B <br />

Atg9A <br />

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Atg9AmRNA siRNA <br />

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EEA1 <br />

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Atg9A

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