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Clearance of Propionibacterium acnes by kupffer cells is regulated by osteopontin through modulating the expression of p47phox.

Abstract：

:Osteopontin (OPN) is a cytokine with multiple functions, including the regulation of innate immune response. However, the detailed function and mechanism of OPN in host defense against invaded microorganisms remain unclear. In this report, we revealed that OPN could affect the clearance of Propionibacterium acnes in kupffer cells. In a murine model of P. acnes induced hepatic granuloma, OPN-deficient mice or wild-type (WT) mice treated with anti-OPN mAb exhibited more hepatic granuloma formation than WT mice. Increased infiltration of intrahepatic leukocytes, higher expression of TLRs, and significantly upregulated level of proinflammatory cytokines of liver tissue were observed in OPN-deficient mice after P. acnes challenge. Moreover, in vitro assay showed that kupffer cells isolated from OPN(-/-) mice exhibited impairment in clearance of P. acnes. Kupffer cells isolated from OPN(-/-) mice showed reduced level of NADPH oxidase-mediated reactive oxygen species (ROS) in response to P. acnes, which was regulated by NADPH oxidase subunit p47phox. Further investigation revealed that OPN interaction with αvβ3 integrin activated PI3K and ERK signal pathways, leading to the expression of p47phox. Taken together, these data demonstrated an important role of OPN in enhancing the antimicrobial innate immune response by modulation of bacterium clearance activity in kupffer cells.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Yang H,Guo H,Fan K,Zhang B,Zhao L,Hou S,Qian W,Zhang D,Wang H,Dai J,Guo Y

doi

10.1016/j.molimm.2011.06.435

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

2019-26

issue

15-16

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(11)00647-X

journal_volume

48

pub_type

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