Abstract:
:1. We describe here the alterations in the nociceptive sensitivity of Swiss CD1 mice receiving an intraplantar (i.pl.) administration of XC Rous sarcoma-virus-transformed rat fibroblasts (XC cells). 2. Histological studies reveal that XC cells remain at the injection site 2-3 weeks after implantation, a time at which an inflammatory reaction is also detected. No tumoral growth was found and 5 weeks after inoculation neither XC cells nor inflammatory reaction were observed. 3. Measures to different types of noxious stimuli were performed. At week 1 after XC cell inoculation, hyperalgesia to thermal, but not mechanical, stimuli as well as to capsaicin injection is present in the implanted paw. At week 5 after XC cell implantation, only thermal hyperalgesia is present, and this enhanced reactivity persisted for even 25 weeks after the disappearance of XC tumoral cells. 4. Pharmacological studies on thermal hyperalgesia were conducted at two different stages, week 1 and week 5 after XC cell inoculation. The systemic administration of morphine (1-10 mg/kg i.p. (intraperitoneal); 30 min before testing) prevents this thermal hyperalgesic reaction both at week 1 and week 5. The endothelin type A (ETA) receptor antagonist BQ-123 (10 nmol; i.pl.; 90 min before testing) abolishes both the early (week 1) and the late (week 5) thermal hyperalgesia. In contrast, the selective endothelin type B (ETB) receptor antagonist, BQ-788 (10 nmol; i.pl.; 90 min before) abolishes thermal hyperalgesia only at week 1, but not at week 5 after XC cell inoculation. 5. It might be concluded that endothelins are probably involved in this type of long-term thermal hyperalgesia produced by the transitory presence of the XC tumoral cell line.
journal_name
Cell Mol Neurobioljournal_title
Cellular and molecular neurobiologyauthors
Baamonde A,Lastra A,Fresno MF,Llames S,Meana A,Hidalgo A,Menéndez Ldoi
10.1023/b:cemn.0000018621.58328.easubject
Has Abstractpub_date
2004-04-01 00:00:00pages
269-81issue
2eissn
0272-4340issn
1573-6830journal_volume
24pub_type
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