An approach to the immunophenotypic features of circulating CD4⁺NKG2D⁺ T cells in invasive cervical carcinoma.

Abstract:

BACKGROUND:NKG2D, an activating immunoreceptor, is primarily restricted to NK cells and CD8(+) T cells. The existence of an atypical cytotoxic CD4(+)NKG2D(+) T cell population has also been found in patients with autoimmune dysfunctions. Nonetheless, contradictory evidence has categorized this population with a regulatory rather than cytotoxic role in other situations. These confounding data have led to the proposal that two distinct CD4(+)NKG2D(+) T cell subsets might exist. The immune response elicited in cervical cancer has been characterized by apparent contradictions concerning the role that T cells, in particular T-helper cells, might be playing in the control of the tumor growth. Interestingly, we recently reported a substantial increase in the frequency of CD4(+)NKG2D(+) T cells in patients with cervical intraepithelial neoplasia grade-1. However, whether this particular population is also found in patients with more advanced cervical lesions or whether they express a distinctive phenotype remains still to be clarified. In this urgent study, we focused our attention on the immunophenotypic characterization of CD4(+)NKG2D(+) T cells in patients with well-established cervical carcinoma and revealed the existence of at least two separate CD4(+)NKG2D(+) T cell subsets defined by the co-expression or absence of CD28. RESULTS:Patients with diagnosis of invasive cervical carcinoma were enrolled in the study. A group of healthy individuals was also included. Multicolor flow cytometry was used for exploration of TCR alpha/beta, CD28, CD158b, CD45RO, HLA-DR, CD161, and CD107a. A Luminex-based cytokine kit was used to quantify the levels of pro- and anti-inflammatory cytokines. We found an increased percentage of CD4(+)NKG2D(+) T cells in patients with cervical cancer when compared with controls. Accordingly with an increase of CD4(+)NKG2D(+) T cells, we found decreased CD28 expression. The activating or degranulation markers HLA-DR, CD161, and CD107a were heterogeneously expressed. The levels of IL-1beta, IL-2, TNF-alpha, and IL-10 were negatively correlated with the percentages of CD4(+)NKG2D(+) T cells in patients with cervical carcinoma. CONCLUSIONS:Taken together, our results reveal the existence of two separate CD4(+)NKG2D(+) T cell subsets defined by the co-expression or absence of CD28, the latter more likely to be present in patients with cervical cancer.

journal_name

J Biomed Sci

authors

Garcia-Chagollan M,Jave-Suarez LF,Haramati J,Bueno-Topete MR,Aguilar-Lemarroy A,Estrada-Chavez C,Bastidas-Ramirez BE,Pereira-Suarez AL,Del Toro-Arreola S

doi

10.1186/s12929-015-0190-7

subject

Has Abstract

pub_date

2015-10-20 00:00:00

pages

91

eissn

1021-7770

issn

1423-0127

pii

10.1186/s12929-015-0190-7

journal_volume

22

pub_type

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