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Flavonoid baicalin inhibits HIV-1 infection at the level of viral entry

  1. Author:
    Li, B. Q.
    Fu, T.
    Yao, D. Y.
    Mikovits, J. A.
    Ruscetti, F. W.
    Wang, J. M.

  2. Author Address

    NCI, Screening Technol Branch, Lab Antiviral Drug Mech, Frederick, MD 21702 USA. NCI, Screening Technol Branch, Lab Antiviral Drug Mech, Frederick, MD 21702 USA. NCI, Frederick Canc Res & Dev Ctr, SAIC Frederick, Intramural Res Support Program, Frederick, MD 21702 USA. Shenyang Airforce Hosp, Sheng Yang, Liaoning Prov, Peoples R China. NCI, Frederick Canc Res & Dev Ctr, Lab Leukocyte BIol, Frederick, MD 21702 USA. NCI, Frederick Canc Res & Dev Ctr, Mol Immunoregulat Lab, Div Basic Sci, Frederick, MD 21702 USA.
    1. Year: 2000
  2. Journal: Biochemical and Biophysical Research Communications
    1. 276
    2. 2
    3. Pages: 534-538
  4. Type of Article: Article
  1. Abstract:

    Baicalin (BA) is a flavonoid compound purified from medicinal plant Scutellaria baicalensis Georgi and has been shown to possess anti-inflammatory and anti-HIV-1 activities. In an effort to elucidate the mechanism of the anti-inflammatory effect of BG we recently found that this flavonoid compound was able to form complexes with selected chemokines and attenuated their capacity to bind and activate receptors on the cell surface. These observations prompted us to investigate whether BA could inhibit HIV-1 infection by interfering with viral entry, a process known to involve interaction between HIV-1 envelope proteins and the cellular CD4 and chemokine receptors. We found that BA at the noncytotoxic concentrations, inhibited both T cell tropic (X4) and monocyte tropic (R5) HIV-1 Env protein mediated fusion with cells expressing CD4/CXCR4 or CD4/CCR5, Furthermore, presence of BA at the initial stage of HIV-1 viral adsorption blocked the replication of HIV-1 early strong stop DNA in cells. Since BA did not inhibit binding of HIV-1 gp120 to CD4, we propose that BA may interfere with the interaction of HIV-1 Env with chemokine coreceptors and block HIV-1 entry of target cells, Therefore, BA can be used as a basis for developing novel anti-HIV-l agents.

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