简介：Humanμ-opioidreceptor(HμOR)withatagofsixconsecutivehistidinesatitscarboxylterminushasbeenexpressedinrecombinantbaculovirusinfectedSf9insectcells.Themaximalbindingcapacityforthe[^3H]diprenorphineand[^3H]ohmefentanyl(Ohm)were9.1±0.7and6.52±0.23nmol/gprotein,respectively.The[^3H]diprenorphineor[^3H]OhmbindingtothereceptorexpressedinSf9cellswasstronglyinhibitedbyμ-selectiveagonists[D-Ala^2,N-methyl-Phe^4,glyol^5]enkephalin(DAGO),Ohm,andmorphine,butneitherbyδnorbyκselectiveagonist.Na^+(100mM)andGTP(50μM)couldreduceHμORagonistsetorphineandOhmaffinitybindingtotheoverexpressedHμOR.μ-selectiveagonistsDAGOandOhmeffectivelystimulated[^35S]GTPγSbinding(EC50=2.7nMand6.9nM)andinhibitedforskolin-stimulatedcAMPaccumulation(IC50=0.9nMand0.3nM).Theagonist-dependenteffectscouldbeblockedbyopioidantagonistnaloxoneorbypretreatmentofcellswithpertussistoxin(PTX).TheseresultsdemonstratedthatHμORoverexpressedinSf9insectcellsfunctionallycoupledtoendogenousCi/oproteins.

简介：研究局部复发和原发肿瘤的二次发展（SPT）是影响口腔鳞状细胞癌（OSCC）患者生存率的重要因素。这篇研究是为了评估研究者们提出的癌变区域理念：与原发性肿瘤相邻的正常组织存在癌前病变，可导致局部复发和SPTs发展。