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Green Tea for HIV Treatment?

The green tea flavonoid EGCG has potential therapeutic value for
treatment to for HIV-1 infection EGCG binds to the CD4 molecule on
T-cells according to research conducted in 2006. “We have
demonstrated clear evidence of high affinity binding of EGCG to the CD4
molecule. EGCG has potential use as an adjunctive treatment in HIV-1
infection.”

J Allergy Cli, Immunol Williamson ME McCormick TG, Nance CL, Shearer WT. 2006;118:1369-1374.
Epigallocatechin gallate, the main polyphenol in green tea, binds to
the T-cell receptor, CD4: potential for HIV-1 therapy.(Recent
Abstracts)(Brief article)
BACKGROUND: The green tea flavonoid, epigallocatechin gallate (EGCG),
has been proposed to have an anti-HIV-1 effect by preventing the
binding of HIV-1 glycoprotein (gp) 120 to the CD4 molecule on T cells.
OBJECTIVE: To demonstrate that EGCG binds to the CD4 molecule at the
gpl20 attachment site and inhibits gp120 binding at physiologically
relevant levels, thus establishing EGCG as a potential therapeutic
treatment for HIV-1 infection. METHODS: Nuclear magnetic resonance
spectroscopy was used to examine the binding of EGCG and control,
(-)-catechin, to CD4-IgG2 (PRO 542). Gp120 binding to human CD4+ T
cells was analyzed by flow cytometry. RESULTS: Addition of CD4 to EGCG
produced a linear decrease in nuclear magnetic resonance signal
intensity from EGCG but not from the control, (-)-catechin. In
saturation transfer difference experiments, addition of 5.8 micromol/L
CD4 to 310 micromol/L EGCG produced strong saturation at the aromatic
rings of EGCG, but identical concentrations of (-)-catechin produced
much smaller effects, implying EGCG/CD4 binding strong enough to reduce
gp120/ CD4 binding substantially. Molecular modeling studies suggested
a binding site for EGCG in the D1 domain of CD4, the pocket that binds
gpl20. Physiologically relevant concentrations of EGCG (0.2 micromol/L)
inhibited binding of gp120 to isolated human CD4+ T cells. CONCLUSION:
We have demonstrated clear evidence of high-affinity binding of EGCG to
the CD4 molecule with a Kd of approximately 10 nmol/L and inhibition
ofgpl20 binding to human CD4+ T cells. CLINICAL IMPLICATIONS:
Epigallocatechin gallate has potential use as adjunctive therapy in
HIV-1 infection.

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