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The present study evaluated the role of AHNAK in Bartonella henselae infection. Mice were intraperitoneally inoculated with 2 × 108 colony-forming units of B. henselae Houston-1 on day 0 and subsequently on day 10. Blood and tissue samples of the mice were collected 8 days after the final B. henselae injection. B. henselae infection in the liver of Ahnak-knockout and wild-type mice was confirmed by performing polymerase chain reaction, with Bartonella adhesion A as a marker. The proportion of B. henselae-infected cells increased in the liver of the Ahnak-knockout mice. Granulomatous lesions, inflammatory cytokine levels, and liver enzyme levels were also higher in the liver of the Ahnak-knockout mice than in the liver of the wild-type mice, indicating that Ahnak deletion accelerated B. henselae infection. The proportion of CD4+interferon-γ (IFN-γ)+ and CD4+interleukin (IL)-4+ cells was significantly lower in the B. henselae-infected Ahnak-knockout mice than in the B. henselae-infected wild-type mice. In vitro stimulation with B. henselae significantly increased IFN-γ and IL-4 secretion in the splenocytes obtained from the B. henselae-infected wild-type mice, but did not increase IFN-γ and IL-4 secretion in the splenocytes obtained from the B. henselae-infected Ahnak-KO mice. In contrast, IL-1α, IL-1β, IL-6, IL-10, RANTES, and tumor necrosis factor-α secretion was significantly elevated in the splenocytes obtained from both B. henselae-infected wild-type and Ahnak-knockout mice. These results indicate that Ahnak deletion promotes B. henselae infection. Impaired IFN-γ and IL-4 secretion in the Ahnak-knockout mice suggests the impairment of Th1 and Th2 immunity in these mice.

bmb reports

<i>Ahnak</i>-knockout mice show susceptibility to<i>Bartonella henselae</i>infection because of CD4+ T cell inactivation and decreased cytokine secretion

Ahnak-knockout mice show susceptibility toBartonella henselaeinfection because of CD4+ T cell inactivation and decreased cytokine secretion