Response of peripheral blood mononuclear cells to conditioned medium from cultured oral squamous cell carcinomas
Braz. oral res
;
25(5): 414-420, Sept.-Oct. 2011. graf, tab
Article
in English
| LILACS
| ID: lil-601880
ABSTRACT
The current study investigated the capacity for tumor factors secreted by head and neck squamous cell carcinoma (HNSCC) cell lines, KB, KB16, and HEP, to induce the secretion of various cytokines from peripheral blood mononuclear cells (PBMCs). PBMCs were isolated from blood samples collected from six healthy volunteers and these cells were incubated for 6, 24, 48, or 72 hours in the presence of 50 percent conditioned medium collected from cultured cell lines pretreated with, or without, stimulants such as phytohemagglutinin (PHA) or lipopolysaccharides (LPS). Aliquots of each supernatant were then assayed for levels of IFN-Γ, vascular endothelial growth factor (VEGF), TNF-α, and IL-4 using enzyme linked immunosorbent assays (ELISAs). Data collected were analyzed using Student's t-test, an ANOVA test followed by Tukey's test, and tests of Pearson's Correlation. PBMCs cultured with KB16-conditioned medium produced the highest levels of IFN-Γ. VEGF was also detected in conditioned media collected from all of the squamous cell carcinoma (SCC) cell lines used, and a significant difference in VEGF levels between control and KB- or KB16-conditioned media was observed. TNF-α was secreted by all PBMC groups within 6 hours of receiving conditioned media, and these levels increased up to the 24 hour timepoint, after which levels of TNF-α stabilized. In contrast, none of the supernatant samples contained detectable levels of IL-4. In combination, these data suggest that direct contact between fresh human PBMCs and conditioned media from tumor cells induces the secretion of TNF-α and VEGF by PBMCs, and this represents an initial angiogenic response.
Full text:
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Index:
LILACS (Americas)
Main subject:
Leukocytes, Mononuclear
/
Carcinoma, Squamous Cell
/
Cytokines
/
Head and Neck Neoplasms
/
Neoplasm Proteins
Limits:
Humans
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2011
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
School of Dentistry/BR
/
Universidade Nove de Julho/BR
/
Universidade de Guarulhos/BR
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