Genistein, a competitive PDE1–4 inhibitor, may bind on high-affinity rolipram binding sites of brain cell membranes and then induce gastrointestinal adverse effects

• Published in: European journal of pharmacology 2010-09, Vol.643 (1), p.113-120
• Main Authors: Shih, Chung-Hong, Lin, Ling-Hung, Lai, Ya-Hsin, Lai, Chi-Yin, Han, Cheng-Ying, Chen, Chien-Ming, Ko, Wun-Chang
• Format: Article
• Language: English
• Subjects: Allergic asthma; Anesthesia; Animals; Binding Sites; Binding, Competitive; Biological and medical sciences; Brain - drug effects; Brain - enzymology; Cell Membrane - drug effects; Cell Membrane - enzymology; Chronic obstructive pulmonary disease, asthma; Cyclic Nucleotide Phosphodiesterases, Type 1 - antagonists & inhibitors; Cyclic Nucleotide Phosphodiesterases, Type 4 - metabolism; Cytokine; Disease Models, Animal; Dose-Response Relationship, Drug; Female; Gastrointestinal adverse effect; Gastrointestinal Tract - drug effects; Genistein; Genistein - adverse effects; Genistein - pharmacology; Genistein - therapeutic use; Guinea Pigs; High-affinity rolipram binding site; Male; Medical sciences; Mice; Mice, Inbred BALB C; Pharmacology. Drug treatments; Phosphodiesterase Inhibitors - adverse effects; Phosphodiesterase Inhibitors - pharmacology; Phosphodiesterase Inhibitors - therapeutic use; Phosphodiesterase isozymes 1–4 inhibition; Pneumology; Protein Binding; Radioligand Assay; Respiratory Hypersensitivity - drug therapy; Respiratory Hypersensitivity - immunology; Rolipram - pharmacology
• ISSN: 0014-2999; 1879-0712
• DOI: 10.1016/j.ejphar.2010.06.026

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 (6.25–50 mg/ml) induced increases of enhanced pause (P enh) values in conscious mice in a concentration-dependent manner. Genistein (30–100 μmol/kg, i.p.) markedly inhibited methacholine (12.5–50 mg/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 μmol/kg). Genistein also markedly attenuated the release of cytokines, including interleukin (IL)-2, IL-4, IL-5, interferon (IFN)-γ and tumor necrosis factor (TNF)-α. Genistein competitively inhibited PDE1–4, with a K i value ranging from 4.3 to 13.7 μM. Genistein (3–300 μM) concentration-dependently displaced 2 nM [ 3H]-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 μmol/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.