US EPA

2460817 

Journal Article 

Mechanisms for monocyte activation in co-culture with autologous tumor spheroids 

Olsnes, C; Heimdal, JH; Kross, K; Olofsson, J; Aarstad, HJ 

2002 

Yes 

Cellular Immunology
ISSN: 0008-8749
EISSN: 1090-2163 

Elsevier 

219 

1 

11-21 

English 

12473263 

10.1016/S0008-8749(02)00014-X 

WOS:000179962900002 

http://www.sciencedirect.com/science/article/pii/S0008874902006159
Exit
 

Biopsies from carcinoma tissue and benign control mucosa from head and neck squamous cell carcinoma patients were used to establish fragment (F)-spheroids in vitro. We have previously shown that autologous monocytes co-cultured with F-spheroids in vitro secrete interleukin (IL)-6 upon 24h in co-culture. Presently, the aim was to study the mechanisms of this monocyte secretion. Paraformaldehyde (0.1% for 2min) or actinomycin-D (1 microg/ml for 24h) pre-treatment of the F-spheroids abolished the monocyte IL-6 co-culture response. Addition of glucose (100mM) or mannose (100mM), and to some extent galactose (100mM), but not fructose (100mM) to the co-cultures, partly inhibited the monocyte IL-6 co-culture response, but such addition did not inhibit the in vitro monocyte lipopolysaccharide (LPS)-generated IL-6 secretion. When mannose was added to the co-cultures, monocyte IL-6 mRNA expression was eradicated in malignant co-cultures and reduced to a low level in benign co-cultures. Addition of mouse anti-human beta(1)-integrin (anti-CD29) antibody (2 microg/ml) diminished the IL-6 co-culture response but not the monocyte LPS-generated IL-6 response. In conclusion, the monocyte IL-6 co-culture response is dependent on live spheroids and to some extent on direct contact with the F-spheroids, possibly via lectin-like receptor(s), the mannose receptor and beta(1)-integrin. 

Neoplasms; Monocyte; Activation; Co-culture; Spheroids; ß-Integrin