ABSTRACT
[This corrects the article DOI: 10.3389/fphys.2020.586843.].
ABSTRACT
Alpha-arbutin (4-hydroxyphenyl alpha-glucopyranoside) is a known inhibitor of tyrosinase in keratinocytes; however, its effect on other genes and pathways in other skin cells has not been thoroughly investigated. In this study, we investigate the mechanism of alpha-arbutin activity in human dermal fibroblast cultures for 48 h. Results showed that the oxidative stress pathway was activated as alpha-arbutin reduced reactive oxygen species. In addition, we found a high possibility of wound healing and the upregulation of the insulin-like growth factor 1 receptor (IFG1R) pathway. We also investigated the role of the NRF2 gene in mediating the alpha-arbutin response. In silico comparative genomics analysis conducted using our original tool, SHOE, suggested transcription factors with a role in tumor suppression and toxicity response as candidates for regulating the alpha-arbutin-mediated pathway.
ABSTRACT
Cerebrovascular diseases (CVD) with high morbidity, disability, mortality, and recurrence rate have become the focus in the medical research. Modern researches have indicated that Guizhi Fuling Prescription (GFP) possesses anti-inflammatory, immune-modulation and anti-oxidative effects and so on. Investigations showed that GFP had been used in the researches of ischemic and hemorrhagic cerebrovascular diseases, mainly used in the clinical research of ischemic cerebrovascular, in which the research of treating acute cerebral infarction gets the best clinical effect of all. In order to provide theoretical reference for intensive research of GFP in treatment of CVD, this article reviewed the research progress in clinical application and mechanisms of GFP in treatment of CVD.
ABSTRACT
The whole seed (W), endosperm (E) and hull (H) of five cultivars of Job's tears (Coix lachryma-jobi Linn. var. ma-yuen Stapf) including Thai Black Phayao, Thai Black Loei, Laos Black Loei, Laos White Loei and Laos Black Luang Phra Bang were processed before solvent extraction by non-cooking, roasting, boiling and steaming Each part of the Job's tears was extracted by the cold and hot process by refluxing with methanol and hexane. The total of 330 extracts included 150 methanol extracts and 180 hexane extracts were investigated for anti-proliferative activity on human colon adenocarcinoma cell line (HT-29) by the sulforhodamine B (SRB) assay. The extracts which gave high anti-proliferative activity were tested for apoptotic activity by acridine orange and ethidium bromide double staining and anti-oxidative activities including free radical scavenging and lipid peroxidation inhibition activities. The extract from the hull of Thai Black Loei roasted before extracting by hot methanol (M-HTBL-R2) showed the highest anti-proliferative activity on HT-29 with the IC50 values of 11.61 ± 0.95 µg/ml, while the extract from the non-cooked hull of Thai Black Loei by cold methanol extraction (M-HTBL-N1) gave the highest apoptosis (8.17 ± 1.18%) with no necrosis. In addition, M-HTBL-R2 and M-HTBL-N1 indicated free radical scavenging activity at the SC50 values of 0.48 ± 0.12 and 2.47 ± 1.15 mg/ml, respectively. This study has demonstrated the anti-colorectal cancer potential of the M-HTBL-R2 and M-HTBL-N1 extracts.
ABSTRACT
Objective: To study the alkaloids from Corydalis saxicola and their anti-oxidative activities. Methods: The alkaloids were separated and purified by various column chromatography and identified according to their spectral analyses. The anti-oxidation activities were investigated on DPPH radical scavenging assay. Results: Sixteen compounds were obtained and identified as cavidine (1), stylopine (2), canadine (3), tetrahydropalmatine (4), cheilanthifoline (5), scoulerine (6), protopine (7), dehydrocheilanthifoline (8), dehydroisoapocavidine (9), berberine (10), dehydrodiscretamine (11), chelerythrine (12), dehydrocavidine (13), corypalline (14), isocorydine (15), and pallidine (16). The alkaloids from C. saxicla were measured by the model of scavenging the stable DPPH radical, which showed a concentration dependent scavenging effect. Conclusion: Compounds 3, 5, 8, 11, and 16 are isolated from C. saxicola for the first time. Compounds 5 and 16 show the strong anti-oxidative activities.
