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An extract of Humicola fuscoatra (UCSC strain no. 108111A) was shown to reactivate latent HIV-1 expression in an in vitro model of central memory CD4+ T cells. We report the bioassay-guided isolation and structure determination of several resorcyclic acid lactones, including four known compounds, radicicol (1, aka. monorden) and pochonins B (2), C (3), and N (4), and three new analogues, radicicols B-D (5-7). Compounds 1-3 and 5 showed moderate activities in the memory T cell model of HIV-1 latency. Radicicol (1) displayed lower potency in reactivating latent HIV-1 (EC50 = 9.1 μM) relative to the HDAC inhibitors apicidin (EC50 = 0.3 μM), romidepsin (EC50 = 0.003 μM), and SAHA (EC50 = 0.6 μM); however, it achieved equivalent maximum efficacy relative to the positive control compounds (98% of SAHA and romidepsin).

journal of natural products

Study of Marine Natural Products Including Resorcyclic Acid Lactones from <i>Humicola fuscoatra</i> That Reactivate Latent HIV-1 Expression in an in Vitro Model of Central Memory CD4+ T Cells

Study of Marine Natural Products Including Resorcyclic Acid Lactones from Humicola fuscoatra That Reactivate Latent HIV-1 Expression in an in Vitro Model of Central Memory CD4+ T Cells