Characterization of the specific response to serotonin of mouse tumour-feeding arterioles.
OBJECTIVE
To investigate the role of tumour versus non-tumour factors in the specific response to serotonin (5-HT) of tumour-feeding arterioles (TFA).


METHODS
Using mouse models of intra-vital microscopy, the response to topical administration of 5-HT was studied in arterioles feeding tumours: fibrosarcoma (Meth A), murine mammary adenocarcinoma (EMT6) and human colo-rectal carcinoma (HRT18) intra-cutaneously implanted.


RESULTS
For all types of tumour, 5-HT induced a far more pronounced constriction of TFA than of control arterioles. The presence of a tumour implanted in the connective tissue between the skin and the cremaster muscle also affected the reactivity of muscle arterioles. Conversely, the response to serotonin by neovessels grown after implantation of an exogenous element under the skin did not differ from that of control arterioles.


CONCLUSIONS
Changes in reactivity to serotonin were not dependent on the type of tumour implanted in the skin and were not present for a non-tumour implant. The presence of the tumour can alter the reactivity of vessels from tissue in contact with the tumour even if these vessels did not feed the tumour. This phenomenon is local and was not found in the vessels at a distance from the tumour.
Laemmel
E
E
Dépt. de Biophysique et INSERM U141, Hôpital F. Widal, Paris, France.
Stücker
O
O
Darmon
P L
PL
Vicaut
E
E
D000818:Animals; D001160:Arterioles / Q000187:drug effects* / Q000473:pathology; D001366:Axillary Artery / Q000187:drug effects; D015179:Colorectal Neoplasms / Q000098:blood supply*; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D018482:Muscle, Skeletal / Q000098:blood supply; D009368:Neoplasm Transplantation; D012701:Serotonin / Q000008:administration & dosage / Q000494:pharmacology*; D012867:Skin / Q000098:blood supply; D012878:Skin Neoplasms / Q000098:blood supply*
D012701:Serotonin