title: Genistein, a competitive PDE1-4 inhibitor, may bind on high-affinity rolipram binding sites of brain cell membranes and then induce gastrointestinal adverse effects.
abstract: The affinities of genistein on phosphodiesterase (PDE)1-4 and cause of gastrointestinal adverse effects of genistein remain unclear. Female BALB/c mice were actively sensitized by intraperitoneal injections of ovalbumin and challenged by aerosolized ovalbumin (1%). After secondary challenge, aerosolized methacholine (6.25-50mg/ml) induced increases of enhanced pause (P(enh)) values in conscious mice in a concentration-dependent manner. Genistein (30-100 micromol/kg, i.p.) markedly inhibited methacholine (12.5-50mg/ml)-induced increase of P(enh) value in the sensitized and challenged mice. In addition, genistein significantly reduced total inflammatory cells, macrophages, lymphocytes, neutrophils, and eosinophils in bronchoalveolar lavage fluid, with the exception that lymphocytes and neutrophils were not significantly inhibited by genistein at the lowest dose (10 micromol/kg). Genistein also markedly attenuated the release of cytokines, including interleukin (IL)-2, IL-4, IL-5, interferon (IFN)-gamma and tumor necrosis factor (TNF)-alpha. Genistein competitively inhibited PDE1-4, with a K(i) value ranging from 4.3 to 13.7 microM. Genistein (3-300 microM) concentration-dependently displaced 2nM [(3)H]-rolipram bound on high-affinity rolipram binding sites of brain cell membranes. The therapeutic ratio of genistein was calculated to be 7.9. Genistein (100 micromol/kg, s.c.) significantly shortened xylazine/ketamine-induced anesthesia, suggesting that genistein administered at a higher dose may have gastrointestinal adverse effects. In conclusion, owing to the low therapeutic ratio of genistein, the gastrointestinal adverse effects may be induced via the binding of genistein on high-affinity rolipram binding sites of brain cell membranes, when it is used for a long term or at higher doses for treating allergies, asthma or chronic obstructive pulmonary disease.
authors.affiliation: Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan.
authors.forename: Chung-Hong
authors.initials: CH
authors.lastname: Shih
authors.forename: Ling-Hung
authors.initials: LH
authors.lastname: Lin
authors.forename: Ya-Hsin
authors.initials: YH
authors.lastname: Lai
authors.forename: Chi-Yin
authors.initials: CY
authors.lastname: Lai
authors.forename: Cheng-Ying
authors.initials: CY
authors.lastname: Han
authors.forename: Chien-Ming
authors.initials: CM
authors.lastname: Chen
authors.forename: Wun-Chang
authors.initials: WC
authors.lastname: Ko
mesh_terms: D000758:Anesthesia; D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D001921:Brain / Q000187:drug effects* / Q000201:enzymology; D002462:Cell Membrane / Q000187:drug effects* / Q000201:enzymology; D054677:Cyclic Nucleotide Phosphodiesterases, Type 1 / Q000037:antagonists & inhibitors; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4 / Q000378:metabolism; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D005260:Female; D041981:Gastrointestinal Tract / Q000187:drug effects*; D019833:Genistein / Q000009:adverse effects* / Q000494:pharmacology / Q000627:therapeutic use; D006168:Guinea Pigs; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects* / Q000494:pharmacology / Q000627:therapeutic use; D011485:Protein Binding; D011869:Radioligand Assay; D012130:Respiratory Hypersensitivity / Q000188:drug therapy / Q000276:immunology; D020889:Rolipram / Q000494:pharmacology*
chemical_list: D010726:Phosphodiesterase Inhibitors; D019833:Genistein; D054677:Cyclic Nucleotide Phosphodiesterases, Type 1; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4; D020889:Rolipram