natural product-like polyprenylated phenols and quinones were synthesized and their neuroprotective activity was tested using human monoamine oxidase B (MAO-B) and SH-SY5Y cells. Eight compounds inhibited MAO-B (IC50 values < 25 μM) and the inhibition mode and molecular docking of two (8c and 16c) were investigated. Compounds inhibiting MAO-B activity were additionally tested for their ability to protect
Six triprenyl phenols that inhibit the in vitro binding of H-3-SCH 23390 to the dopamine D-1 receptor subfamily in rat striatal brain membranes were isolated from extracts of the edible mushroom Albatrellus ovinus. The compounds, of which scutigeral 1a, ilicicolin B 3, neogrifolin 5a and grifolin 6 are known while ovinal 2 and ovinol 4a are new, were isolated by chromatography and their structures were determined by spectroscopic techniques The IC50 values of the most potent compound, scutigeral 2a, is 2.6 mu M and it was shown that it decreases the binding affinity of H-3-SCH 23390 in a competitive manner. Compounds 1-5 showed no inhibition on the binding of H-3-spiperone to the dopamine D-2 receptor subfamily, indicating that these compounds interact selectively with the dopamine D-1 receptor subfamily.