CD4+ and CD8+ T-cell skewness in classic Kaposi sarcoma.

Abstract:

:It is widely accepted that a deranged immune system plays a key role in the onset and evolution of classic Kaposi sarcoma (CKS). Nevertheless, the usage of the T-cell receptor (TCR) β-variable (BV) chain repertoire expressed by peripheral blood lymphocytes in patients with CKS is still unknown. With the aim of providing some further insights into the complex role of the immune system in CKS pathogenesis, we performed an extensive analysis of the TCR BV repertoire in both CD4(+) and CD8(+) T cells in 30 human herpesvirus 8-positive Sardinian patients with CKS and an equal number of age-matched healthy controls. We used a panel of monoclonal antibodies covering approximately 70% of human BV subfamilies and third complementarity determining region (CDR3) spectratyping. Patients with CKS showed an increased frequency of BV expansions in both CD4(+) and CD8(+) lymphocytes, with no prevalent clones. On spectratyping analysis, most of the 720 BV CDR3 profiles obtained from both CD4(+) and CD8(+) T cells in patients with CKS were skewed. In particular, the surprising increase of BV skewing observed in CD4(+) lymphocytes mimics the pattern of progressive TCR BV narrowing described in responses to persistent viral antigen stimulations. Our findings support the hypothesis that CKS evolution is associated with inadequate activation rather than impairment of the immune system.

journal_name

Neoplasia

authors

Galleu A,Fozza C,Simula MP,Contini S,Virdis P,Corda G,Pardini S,Cottoni F,Pruneddu S,Angeloni A,Ceccarelli S,Longinotti M

doi

10.1596/neo.11646

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

487-94

issue

6

eissn

1522-8002

issn

1476-5586

journal_volume

14

pub_type

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