Arginase-1 mRNA expression correlates with myeloid-derived suppressor cell levels in peripheral blood of NSCLC patients.
Lung Cancer
; 81(3): 468-474, 2013 Sep.
Article
en En
| MEDLINE
| ID: mdl-23850196
ABSTRACT
Myeloid-derived suppressor cells (MDSC) are a heterogeneous population of immature and progenitor myeloid cells with immunosuppressive activity that are increased in cancer patients. Until now, the characterization of MDSC in humans was very challenging. The aim of this study was to determine the characterization and optimal assessment of MDSC and to investigate their presence and function in blood of advanced-stage NSCLC patients. We determined MDSC and lymphocyte populations in peripheral blood mononuclear cells (PBMC) samples of 185 treatment-naïve NSCLC patients and 20 healthy controls (HC). NSCLC patients had an increased population of PMN-MDSC compared to HC (p < 0.0001). Frequencies of CD4(+) and CD8(+) T-cells were significantly decreased in NSCLC patients (p < 0.0001 and p = 0.05). We found that PMN-MDSC were able to suppress T-cell proliferation in vitro. qRT-PCR showed that arginase-1 (Arg-1) mRNA is mainly expressed by MDSC and that the level of Arg-1 in PBMC correlates with the frequency of MDSC in PBMC (Spearman's rho 0.797). There were significant differences in MDSC and lymphocyte populations between NSCLC patients and HC. We found that MDSC frequencies are stable up to six hours at room temperature after blood was drawn and that cryopreservation leads to a strong decrease of MDSC in PBMC. We show that Arg-1 mRNA expression is a valuable method to determine the levels of MDSC in peripheral blood of cancer patients. This method is therefore a useful alternative for the complex flowcytometric analysis in large multicenter patient studies.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Arginasa
/
Expresión Génica
/
Carcinoma de Pulmón de Células no Pequeñas
/
Células Mieloides
/
Neoplasias Pulmonares
Tipo de estudio:
Clinical_trials
Límite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Lung Cancer
Asunto de la revista:
NEOPLASIAS
Año:
2013
Tipo del documento:
Article