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, 139 (3), 598-602

Oral Administration of Active Hexose Correlated Compound Enhances Host Resistance to West Nile Encephalitis in Mice

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Oral Administration of Active Hexose Correlated Compound Enhances Host Resistance to West Nile Encephalitis in Mice

Shuhui Wang et al. J Nutr.

Abstract

West Nile virus (WNV) poses a serious threat to public health, especially to the elderly and the immuno-compromised. Neither vaccines nor treatments are available for humans. Active hexose correlated compound (AHCC) is an extract of Lentinula edodes of the Basidiomycete family of fungi rich in alpha-glucans. In this study, we evaluated the effect of AHCC on host susceptibility in the murine model of WNV infection. Mice orally administered with AHCC (600 mg/kg) every other day for 1 wk before and at d 1 and 3 postinfection were assessed using viremia levels, survival rate, and protective immunity. AHCC administration in young (6- to 8-wk-old) mice attenuated viremia and mortality following lethal WNV infection. WNV-specific IgM and IgG production and gammadelta T cell expansion were also enhanced in these mice. Aged (21- to 22-mo-old) mice were more susceptible to WNV infection than young mice, partially due to the dysfunction of gammadelta T cell subsets. AHCC administration in aged mice enhanced the protective Vgamma1(+) T cell response as well as WNV-specific IgG but not IgM antibodies production. AHCC administration in aged mice attenuated viremia levels but led to no difference in mortality rate. Overall, our data suggests that AHCC enhances protective host immune responses against WNV infection in young and aged mice. Dietary supplementation with AHCC may be potentially immunotherapeutic for WNV-susceptible populations.

Figures

FIGURE 1
FIGURE 1
AHCC enhances host resistance to WNV infection in young mice. (A) Percent survival; n = 24 (AHCC treated) or 23 (control). (B) Viral load. The y-axis depicts the ratio of the amplified WNVE cDNA to β-actin cDNA of each group. Values are means ± SEM, n = 5. Data shown were representative of 2 independent experiments. *Different from control, P < 0.05.
FIGURE 2
FIGURE 2
WNV infection in controls and AHCC-treated aged mice. (A) WNV-specific IgG antibodies in sera. Values are means ± SEM, n = 8. (B) Viremia levels. Values are means ± SEM, n = 9 (AHCC-treated) or 10 (control). (C) Percent survival. n = 10 (control) or 11 (AHCC-treated). *Different from control, P < 0.05.

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