Evidence of T cell receptor beta-chain patterns in inflammatory and noninflammatory bowel disease states.
Am J Physiol
; 276(3): G613-21, 1999 03.
Article
em En
| MEDLINE
| ID: mdl-10070037
ABSTRACT
T cell activation, as defined by expression of relevant cell surface molecules, such as the interleukin-2 receptor (CD25), is increased in many chronic relapsing diseases, including inflammatory bowel disease (IBD). These T cells are generally activated through contact of their clonotypic T cell receptor (TCR) with a peptide antigen presented by a major histocompatibility complex molecule. One of the putative antigenic contact sites for the TCR is the third complementarity determining region (CDR3) of the TCR beta-chain variable region (TCRBV). Therefore, analysis of the TCRBV CDR3 provides insight into the diversity of antigens encountered by a given T cell population. This study evaluated the TCRBV CDR3 usage of the activated intestinal lymphocytes from human subjects with IBD, diverticulitis (inflammatory control), and a normal tissue control. Public patterns, as demonstrated by shared TCRBV CDR3 amino acid sequences of activated intestinal T cell subpopulations, were observed. In particular, a public pattern of TCRBV22, a conserved valine in the fifth position, and use of TCRBJ2S1 or TCRBJ2S5 was present in three of four Crohn's disease subjects while not present in the ulcerative colitis subjects. However, the private patterns of TCRBV CDR3 region amino acid sequences were far more striking and easily demonstrated in all individuals studied, including a normal noninflammatory control. Thus we conclude that selective antigenic pressures are prevalent among an individual's activated intestinal lymphocytes.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Doenças Inflamatórias Intestinais
/
Receptores de Antígenos de Linfócitos T alfa-beta
/
Enteropatias
Limite:
Humans
Idioma:
En
Revista:
Am J Physiol
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Estados Unidos