Persistence of CCR5 usage among primary human immunodeficiency virus isolates of individuals receiving intermittent interleukin-2

S. Ghezzi, F. Pacciarini, S. Nozza, S. Racca, S. A. Mariani, E. Vicenzi, A. Lazzarin, F. Veglia, G. Tambussi, G. Poli

Research output: Contribution to journalArticle


Objective: To investigate the impact of intermittent interleukin-2 (IL-2) plus combination antiretroviral therapy (cART) on HIV-1 entry co-receptor use. Methods: Primary HIV-1 isolates were obtained from 54 HIV-1-positive individuals at baseline and after 12 months using co-cultivation of peripheral blood mononuclear cells (PBMC) with activated PBMC of HIV-negative healthy donors. HIV-1 co-receptor use was determined on U87-CD4 cells. Results: Fourteen out of the 21 (67%) IL-2-treated individuals harbouring a primary CCR5-dependent (R5) HIV-1 isolate at baseline confirmed an R5 virus isolation after 12 months in contrast to 3 out of 7 (43%) of those receiving cART only. After 12 months, only 1 R5X4 HIV-1 isolate was obtained from 21 cART+IL-2-treated individuals infected with an R5 virus at entry (5%) vs. 2/7 (29%) patients receiving cART alone, as confirmed by a 5-year follow-up on some individuals. Conclusions: Intermittent IL-2 administration plus cART may prevent evolution towards CXCR4 usage in individuals infected with R5 HIV-1.

Original languageEnglish
Pages (from-to)349-352
Number of pages4
JournalHIV Medicine
Issue number5
Publication statusPublished - 2010



  • CART
  • CCR5
  • CXCR4
  • HIV isolation
  • IL-2 therapy
  • Viremia

ASJC Scopus subject areas

  • Infectious Diseases
  • Pharmacology (medical)
  • Health Policy
  • Medicine(all)

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