Antagonist-Agonist Activity of Some N-Substituted Benzomorphans

Kawamura, Naoki; Kataoka, Tamaki; Imai, Eiji; Iwamura, Takashi; Hori, Mikio; Niwa, Masayuki; Nozaki, Masakatsu; Fujimura, Hajimè

doi:10.1016/b978-0-444-80402-0.50138-8

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The µ receptors interact with methyl-, allyl-, cyclopropylmethyl-, and cyclobutylmethyl-groups, binding with the nitrogen atom in the D ring. [30][31][32][33][34] Meanwhile, human and bovine UGTs did not interact with methyl-(TL8) and isopropyl groups (TL1). Thus, substrate specificity for UGT as shown in this study is clearly different from the substrate specificity and affinities for µ receptors as anodynes.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Substrate Specificity of Opioid Compounds to UDP-Glucuronosyltransferase (UGT), hUGT2B7 and Bovine Microsomal UGT

Iwamura

Ito

Kuno

et al. 2005

JOURNAL OF HEALTH SCIENCE

View full text Add to dashboard Cite

We studied the substrate specificity of some opioid derivatives of 5,9-dimethyl-2′-hydroxybenzomorphan [1], composed of A, B, and D ring-systems of morphine, for human UDP-glucuronosyltransferase 2B7 (hUGT2B7), a typical glucuronidation enzyme to morphine and for bovine microsomal UGT. The group of nitrogen atom on the D ring (pyperidine ring) in [1] was modified with alkyl, alkenyl, alkynyl and aralkyl hydrocarbon substituents. hUGT2B7 did not react with the compounds with methyl and isopropyl groups on the nitrogen atom, but reacted with those having longer alkyl substituents of more than 3 carbon chains. Substances with alkenyl and isobutyl substituents are the best substrates (the Km value, 15 and 25 µM, respectively). Opioids with alkynyl and aralkyl hydrocarbon substituents are of low affinity (the Km value, 119 and 542 µM, respectively). Meanwhile, bovine enzyme did not react with opioid substances having methyl and isopropyl groups, like hUGT2B7. Bovine enzyme reacted well with opioid substances with alkenyl and alkynyl substituents on the same level as alkyl substituents. Thus, a clear difference between human UGT2B7 and bovine microsomal UGT was found in the reactivity of alkynyl group and this comes from species specificity. For development of effective opioid drugs, these results suggest that opioid compounds with short carbon substituents are better to maintain the effective level in the blood for a longer time, with low glucuronidation activity, as well as maintaining the analgesic potency of each drug.

show abstract

Section: Discussionmentioning

confidence: 99%

“…These are synthesized from TL13 30) by addition of those substituents and the method of synthesis was published according to a previous report. [31][32][33] TL3-7 were different from the structure of [1] but related to the basic structure of morphine. TL3, 34) TL4, 35) TL5, 36) and TL6 37) were prepared by the described methods.…”

Section: Methodsmentioning

confidence: 99%