Study on the Active Components and Inhibiting Effect of Melastoma dodecandrum Lour. on Human Cervical Cancer Cells Based on Spectrum–Effect Relationship Analysis

The ethnic drug Melastoma dodecandrum Lour. (MDL) is an important medicinal plant with potential antitumor properties, which have been proposed as promising anticancer agents, but the material basis for its therapeutic effect is still unclear and lacks in-depth research. In this study, the in vitro antitumor effects of different MDL extracts in different gynecological tumor cells were investigated by CCK-8 assay. The active components of 21 batches of MDL samples collected from different product areas and markets were determined and compared by the UPLC method. On this basis, the data was processed with the fingerprint similarity software, and the correlation between MDL fingerprint and antihuman cervical cancer activity was further analyzed by a multivariate statistical method. Five kinds of MDL extracts, including the aqueous extract, the crude polysaccharide, the total polyphenol, the ethyl acetate fraction of the aqueous extract and 50% ethanol extract, had inhibitory effects on human cervical cancer HeLa and SiHa cells, among which total polyphenols of MDL showed stronger inhibition effect on human cervical cancer cells. In addition, the fingerprint of the total polyphenols of MDL had sixteen common peaks, and six common peaks were checked by using diode array and UV spectra, among which peak 1 (gallic acid), peak 4 (protocatechuic acid), peak 12 (unknown), and peak 15 (ellagic acid) were negatively correlated with the IC50 value of the SiHa cells, and all variable importance values were greater than 1. Our data demonstrated that the main active components of MDL inhibiting human cervical cancer SiHa cells may be the synergistic effect of gallic acid, protocatechuic acid and ellagic acid, and the further spectrum-effect relationship analysis provides an important reference and basis for the quality control and the development of new anticervical cancer drug of MDL.