title: Increased survival of tumor-bearing mice by the delta opioid SNC 80.
abstract: Opioids represent a major source of relief from pain. However, opioid abuse may cause immunosuppression and cancer. We have recently reported results on novel non-peptidic delta- and mu-selective opioids that induced immunopotentiation of T cell and macrophage functions in vitro and ex vivo. In the present study, the effects of the delta-opioid receptor agonist and potent analgesic (+)-4-((alpha R)-alpha-((2S, 5R)-4-allyl-2, 5-dimethyl-1-piperazinyl)-3-methoxybenzyl)-N, N-diethyl-benzamide (SNC80) on in vitro and in vivo tumor cell growth were investigated using the L5178Y-R murine model. SNC80 marginally, but significantly (p < 0.05), inhibited (up to 14%) the in vitro growth of L5178Y-R tumor cells. However, in vivo intratumor administration of SNC80 (2 and 4 mg/kg) reduced up to 60% L5178Y-R tumor-bearing Balb/c mice death, and significantly (p < 0.05) reduced tumor weights (up to 73% reduction) in these animals. This study may support the evaluation of SNC80 in preclinical and clinical studies.
authors.affiliation: Departamento de Microbiología e Inmunología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, NL, México. rgomez60@hotmail.com
authors.forename: Ricardo
authors.initials: R
authors.lastname: Gomez-Flores
authors.forename: Diana
authors.initials: D
authors.lastname: Caballero-Hernández
authors.forename: Reyes
authors.initials: R
authors.lastname: Tamez-Guerra
authors.forename: Cristina
authors.initials: C
authors.lastname: Rodríguez-Padilla
authors.forename: Patricia
authors.initials: P
authors.lastname: Tamez-Guerra
authors.forename: Kenner C
authors.initials: KC
authors.lastname: Rice
authors.forename: Mary E
authors.initials: ME
authors.lastname: Hicks
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Weber
mesh_terms: D000818:Animals; D001549:Benzamides / Q000494:pharmacology*; D048708:Cell Growth Processes / Q000187:drug effects; D045744:Cell Line, Tumor; D005260:Female; D008223:Lymphoma / Q000188:drug therapy* / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008811:Mice, Inbred DBA; D009368:Neoplasm Transplantation; D010879:Piperazines / Q000494:pharmacology*
chemical_list: D001549:Benzamides; D010879:Piperazines; C088464:4-(alpha-(4-allyl-2,5-dimethyl-1-piperazinyl)-3-methoxybenzyl)-N,N-diethylbenzamide