RT Journal Article
T1 The frequency of α₄β₇(high) memory CD4⁺ T cells correlates with susceptibility to rectal simian immunodeficiency virus infection
A1 Martinelli, Elena
A1 Veglia, Filippo
A1 Goode, Diana
A1 Guerra Pérez, Natalia
A1 Aravantinou, Meropi
A1 Arthos, James
A1 Piatak, Michael  Jr
A1 Lifson, Jeffrey
A1 Blanchard, James
A1 Gettie, Agegnehu
A1 Robbiani, Melissa
AB Basic and Translational ScienceThe Frequency of α4β7high Memory CD4+ T Cells Correlates With Susceptibility to Rectal Simian Immunodeficiency Virus InfectionMartinelli, Elena PhD, MPH*; Veglia, Filippo PhD*; Goode, Diana PhD*; Guerra-Perez, Natalia PhD*; Aravantinou, Meropi MS*; Arthos, James PhD†; Piatak, Michael Jr DMV, PhD‡; Lifson, Jeffrey D. MD‡; Blanchard, James PhD§; Gettie, Agegnehu BS‖; Robbiani, Melissa PhD*Author InformationJAIDS Journal of Acquired Immune Deficiency Syndromes 64(4):p 325-331, December 1, 2013. | DOI: 10.1097/QAI.0b013e31829f6e1aBuySDCMetricsAbstractBackground: Integrin α4β7 (α4β7) mediates the homing of CD4+ T cells to gut-associated lymphoid tissues, which constitute a highly favorable environment for HIV expansion and dissemination. HIV and simian immunodeficiency virus (SIV) envelope proteins bind to and signal through α4β7 and during acute infection SIV preferentially infects α4β7high CD4+ T cells. We postulated that the availability of these cells at the time of challenge could influence mucosal SIV transmission and acute viral load (VL).Methods: We challenged 17 rhesus macaques with 3000 TCID50 of SIVmac239 rectally and followed the subsets of α4β7+ T cells and dendritic cells (DCs) by flow cytometry in blood and tissues, before and after challenge.Results: We found that the frequency of memory CD4+ T cells that expressed high levels of α4β7 (α4β7high memory CD4+ T cells) in blood before challenge correlated strongly with susceptibility to infection and acute VL. Notably, not only at the time of challenge but also their frequency 3 weeks before challenge correlated with infection. This association extended to the rectal tissue as we observed a strong direct correlation between the frequency of α4β7high memory CD4+ T cells in blood and rectum before and after challenge. The frequency of α4β7+ myeloid DCs and α4β7high CD80+ DCs also correlated with infection and acute VL, whereas blood CCR5+ and CD69+ CD4+ T cells could not be associated with infection.Conclusions: Our results suggest that animals with higher frequency of α4β7high CD4+ T cells in circulation and in rectal tissue could be more susceptible to SIV rectal transmission.
SN 1525-4135
YR 2013
FD 2013

LK https://hdl.handle.net/20.500.14352/97750
UL https://hdl.handle.net/20.500.14352/97750
LA eng
NO Martinelli, Elena, et al. «The Frequency of Α4β7 High Memory CD4+ T Cells Correlates With Susceptibility to Rectal Simian Immunodeficiency Virus Infection». JAIDS Journal of Acquired Immune Deficiency Syndromes, vol. 64, n.o 4, diciembre de 2013, pp. 325-31. https://doi.org/10.1097/QAI.0b013e31829f6e1a.
DS Docta Complutense
RD 7 abr 2025