Mantegazza P, Tammiso R, Zambotti F, Zecca L, Zonta N
Br J Pharmacol. 1984 Dec;83(4):883-8. doi: 10.1111/j.1476-5381.1984.tb16527.x.
The effects of a series of adenosine derivatives on morphine antinoceptive effect were investigated in rats by the 'tail-flick' method. 2-Chloroadenosine (CADO) and L-N6-phenylisopropyladenosine (L-PIA), given intraperitoneally, caused decreased morphine antinociception. Intracerebroventricular injections of CADO, L-PIA and 5'-N-ethylcarboxamide adenosine (NECA), but not of 2'-deoxyadenosine, antagonized morphine antinociception. The effects of both central and peripheral injections of CADO and L-PIA on morphine antinociception were partially reversed by caffeine. Intracerebroventricular injection of dibutyryl-cyclic 3', 5' adenosine monophosphate (db cyclic AMP) had no effect on morphine antinociception. These data indicate that adenosine plays a role in morphine-induced antinociception. The results are discussed in terms of postulated effects of adenosine derivatives on adenylate cyclase.
采用“甩尾”法在大鼠中研究了一系列腺苷衍生物对吗啡镇痛作用的影响。腹腔注射2-氯腺苷(CADO)和L-N6-苯基异丙基腺苷(L-PIA)可导致吗啡镇痛作用减弱。脑室内注射CADO、L-PIA和5'-N-乙基羧酰胺腺苷(NECA),但不注射2'-脱氧腺苷,可拮抗吗啡镇痛作用。腹腔和脑室内注射CADO和L-PIA对吗啡镇痛作用的影响均被咖啡因部分逆转。脑室内注射二丁酰环3',5'-单磷酸腺苷(db环磷酸腺苷)对吗啡镇痛作用无影响。这些数据表明腺苷在吗啡诱导的镇痛中起作用。根据腺苷衍生物对腺苷酸环化酶的假定作用对结果进行了讨论。