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. 1997 Sep 15;100(6):1465–1474. doi: 10.1172/JCI119667

Modulation of the effector function of human macrophages for Histoplasma capsulatum by HIV-1. Role of the envelope glycoprotein gp120.

S Chaturvedi 1, S L Newman 1
PMCID: PMC508325  PMID: 9294112

Abstract

We have demonstrated that monocyte-derived macrophages (Mphi) from HIV+ individuals are deficient in their capacity to phagocytose Histoplasma capsulatum (Hc) yeasts, and are more permissive for the intracellular growth of Hc. To determine whether these defects in Mphi function were caused by HIV infection of the Mphi and/or by pathological events associated with HIV infection, cultured normal human Mphi were infected with the HIV-1BaL strain. Virus production, quantified by reverse transcriptase activity and p24 antigen, was evident on day 8 after infection and peaked on day 16. On days 12, 16, and 20 after infection, HIV-1-infected Mphi were deficient in their capacity to recognize and bind Hc yeasts compared with control Mphi, and also were more permissive for the intracellular growth of Hc. Culture of normal Mphi with the envelope glycoprotein gp120 inhibited phagocytosis of Hc yeasts by Mphi in a concentration-dependent manner, but did not cause more rapid intracellular growth of Hc. Normal Mphi cultured in the serum of HIV+ individuals with impaired Mphi function subsequently were deficient in their capacity to phagocytose Hc yeasts, and were more permissive for the intracellular growth of yeasts compared with Mphi cultured in normal serum. Conversely, culture of normal Mphi in the serum of HIV+ patients with normal Mphi function did not affect the interaction of Hc yeasts with Mphi. Moreover, when Mphi from HIV+ individuals that were initially defective in host defense against Hc were cultured in normal HIV- serum, normal Mphi function was demonstrated. Adsorption of gp120 from the serum of two HIV+ patients removed the capacity of the serum to cause a Mphi defect in phagocytosis of Hc, but had no effect on the capacity of the serum to cause accelerated intracellular growth. These data demonstrate that observed defects in Mphi interaction with Hc yeasts may be caused by gp120 and other, as yet unknown serum component(s) probably released into serum by HIV-infected cells.

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Selected References

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