Fine-tuning Tumor Immunity with Integrin Trans-regulation.
Cancer Immunol Res
; 3(6): 661-7, 2015 Jun.
Article
em En
| MEDLINE
| ID: mdl-25600437
ABSTRACT
Inefficient T-cell homing to tissues limits adoptive T-cell immunotherapy of solid tumors. αLß2 and α4ß1 integrins mediate trafficking of T cells into tissues via engagement of ICAM-1 and VCAM-1, respectively. Inhibiting protein kinase A (PKA)-mediated phosphorylation of α4 integrin in cells results in an increase in αLß2-mediated migration on mixed ICAM-1-VCAM-1 substrates in vitro, a phenomenon termed "integrin trans-regulation." Here, we created an α4(S988A)-bearing mouse, which precludes PKA-mediated α4 phosphorylation, to examine the effect of integrin trans-regulation in vivo. The α4(S988A) mouse exhibited a dramatic and selective increase in migration of lymphocytes, but not myeloid cells, to sites of inflammation. Importantly, we found that the α4(S988A) mice exhibited a marked increase in T-cell entry into and reduced growth of B16 melanomas, consistent with antitumor roles of infiltrating T cells and progrowth functions of tumor-associated macrophages. Thus, increased α4 trans-regulation of αLß2 integrin function biases leukocyte emigration toward lymphocytes relative to myeloid cells and enhances tumor immunity.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Integrinas
/
Neoplasias
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Cancer Immunol Res
Ano de publicação:
2015
Tipo de documento:
Article