title: Structural effects of N-aromatic acyl-amino acid conjugates on their deconjugation in the cecal contents of rats: implication in design of a colon-specific prodrug with controlled conversion rate at the target site.
abstract: N-aromatic acyl-amino acid conjugates possess a colon-targeted property, implying that such conjugates are stable and are not absorbable until reaching the large intestine in which they are microbially converted (hydrolysed) to the parent drugs that are therapeutically active. To investigate the structural effect of N-aromatic acyl-amino acid conjugates on the large intestinal deconjugation, the hydrolysis of various N-aromatic acyl-amino acid conjugates was examined in the cecal contents. On incubation of conjugates with glycine, D or/and L forms of alanine or phenylalanine in the cecal contents, the conjugates with D amino acids were not hydrolysed. The other conjugates are susceptible to the hydrolysis, the rates of which decreased as the size of the substituent on the 2-position of the amino acids increased. The conjugates with alkyl analogs (2-4 carbons) of glycine and taurine were resistant to the hydrolysis, while taurine- and glycine-conjugates were hydrolysed effectively. The hydrolysis of N-aromatic acyl-glycine conjugates was enhanced by para-substitution of electron withdrawing groups on the aromatic acyl moiety and vice versa for electron-donating groups. While a methyl, methoxy or chloro group on the ortho-position retarded the hydrolysis, a hydroxyl group on the position accelerated it. Our data may provide useful information for the design of a colon-specific prodrug with controlled conversion rate in the large intestine.
authors.affiliation: Laboratory of Biomedicinal Chemistry, College of Pharmacy, Pusan National University, Busan, Republic of Korea.
authors.forename: Hyesik
authors.initials: H
authors.lastname: Kong
authors.forename: Hyunjeong
authors.initials: H
authors.lastname: Kim
authors.forename: Heejeong
authors.initials: H
authors.lastname: Do
authors.forename: Yonghyun
authors.initials: Y
authors.lastname: Lee
authors.forename: Sungchae
authors.initials: S
authors.lastname: Hong
authors.forename: Jeong-Hyun
authors.initials: JH
authors.lastname: Yoon
authors.forename: Yunjin
authors.initials: Y
authors.lastname: Jung
authors.forename: Young Mi
authors.initials: YM
authors.lastname: Kim
mesh_terms: D000409:Alanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000378:metabolism; D024322:Amino Acids, Aromatic / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D002432:Cecum / Q000378:metabolism*; D003106:Colon / Q000378:metabolism; D003692:Delayed-Action Preparations; D005472:Fluorouracil / Q000031:analogs & derivatives / Q000378:metabolism; D005766:Gastrointestinal Contents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008297:Male; D058990:Molecular Targeted Therapy; D011355:Prodrugs / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013329:Structure-Activity Relationship
chemical_list: D024322:Amino Acids, Aromatic; D000964:Antimetabolites, Antineoplastic; D003692:Delayed-Action Preparations; D011355:Prodrugs; C047207:N-benzoylalanine; D000409:Alanine; D005472:Fluorouracil