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Salivary gland epithelial cells (SGEC): carriers of exquisite B7-2 (CD86) costimulatory molecules.

Abstract：

:Costimulatory molecules are cell-surface glycoproteins that can direct, modulate and fine tune immune responses. B7-2(CD86) costimulatory molecules are considered as major regulators of T cell responses, acting by appropriate interactions with the stimulatory CD28 or inhibitory CTLA-4 receptors found on T cells. Although their expression is thought to be restricted in lymphoid cells, evidence raised during the last decade show their expression in other types of cells, including human non-neoplastic salivary gland epithelial cells (SGEC). The expression of B7-2 molecules by SGECs requires special attention, due to their unique expression pattern and distinctive binding properties. Thus, SGECs express three B7-2 alternate transcripts that encode the full-length protein, the soluble form and a truncated membrane-bound molecule, that lacks the IgV-like counter-receptor binding domain and has a negative regulatory role. A similar pattern of expression is observed in monocytes, but not in several other types of cells, including dendritic cells. Furthermore, the full-length B7-2 molecules in SGEC display unique binding properties, denoted by the functional interaction with CD28 receptor, but reduced binding of the negative regulator CTLA-4. These distinctive features suggest the tight regulation of B7-2 molecules expression and indicate the key immunoregulatory role of SGECs.

journal_name

J Autoimmun

journal_title

Journal of autoimmunity

authors

Kapsogeorgou EK,Manoussakis MN

doi

10.1016/j.jaut.2010.06.006

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

188-91

issue

3

eissn

0896-8411

issn

1095-9157

pii

S0896-8411(10)00061-2

journal_volume

35

pub_type

杂志文章

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