Characterization of Mycotypha Metabolites Found to be Inhibitors of Cell Adhesion Molecules

Abstract

Three inhibitors of cell adhesion based on LFA-1/ICAM-1 were isolated from the cultured broth of the fungal strain Mycotypha sp. UMF-006. These compounds were identified by spectroscopy to be cytochalasin E (1), 5, 6-dehydro-7-hydroxy derivative of cytochalasin E (2) and Δ^{6, 12}-isomer of 2 (3). All these components inhibited adhesion of HL-60 cells to CHO-ICAM-1 cells at IC₅₀ values of 30μg/ml for 1, 75μg/ml for 2, and 90μg/ml for 3.