In Vivo Treatment with Insulin-like Growth Factor 1 Reduces CCR5 Expression on Vaccine-Induced Activated CD4+ T-Cells

Massimiliano Bissa, Veronica Galli, Luca Schifanella, Monica Vaccari, Mohammad Arif Rahman, Giacomo Gorini, Nicolò Binello, Sarkis Sarkis, Anna Gutowska, Isabela Silva de Castro, Melvin N. Doster, Ramona Moles, Guido Ferrari, Xiaoying Shen, Georgia D. Tomaras, David C. Montefiori, Kombo F. N’guessan, Dominic Paquin-Proulx, Pamela A. Kozlowski, David J. VenzonHyoyoung Choo-Wosoba, Matthew W. Breed, Joshua Kramer, Genoveffa Franchini

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

At the heart of the DNA/ALVAC/gp120/alum vaccine’s efficacy in the absence of neutralizing antibodies is a delicate balance of pro- and anti-inflammatory immune responses that effectively decreases the risk of SIVmac251 acquisition in macaques. Vaccine efficacy is linked to antibodies recognizing the V2 helical conformation, DC-10 tolerogenic dendritic cells eliciting the clearance of apoptotic cells via efferocytosis, and CCR5 downregulation on vaccine-induced gut homing CD4+ cells. RAS activation is also linked to vaccine efficacy, which prompted the testing of IGF-1, a potent inducer of RAS activation with vaccination. We found that IGF-1 changed the hierarchy of V1/V2 epitope recognition and decreased both ADCC specific for helical V2 and efferocytosis. Remarkably, IGF-1 also reduced the expression of CCR5 on vaccine-induced CD4+ gut-homing T-cells, compensating for its negative effect on ADCC and efferocytosis and resulting in equivalent vaccine efficacy (71% with IGF-1 and 69% without).

Original languageEnglish
Article number1662
JournalVaccines
Volume11
Issue number11
DOIs
StatePublished - Nov 2023
Externally publishedYes

Scopus Subject Areas

  • Immunology
  • Pharmacology
  • Drug Discovery
  • Infectious Diseases
  • Pharmacology (medical)

Keywords

  • CCR5
  • CD4
  • HIV
  • IGF-1
  • insulin-like growth factor
  • SIV
  • T-cells

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