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Antiproliferative xanthone derivatives from Calophyllum inophyllum and Calophyllum soulattri
Siau Hui Mah1, Gwendoline Cheng Lian Ee2, Soek Sin Teh2
1Department of Chemistry, Faculty of Science, University Putra Malaysia, UPM Serdang, Selangor, Malaysia / School of Bioscience, Taylor's University, Lakeside Campus, Subang Jaya, Selangor, Malaysia.
Abstract:
Structure-activity relationships of eleven xanthones were comparatively predicted for four cancer cell lines after the compounds were subjected to antiproliferative assay against B-lymphocyte cells (Raji), colon carcinoma cells (LS174T), human neuroblastoma cells (IMR-32) and skin carcinoma cells (SK-MEL-28). The eleven chemical constituents were obtained naturally from the stem bark of Calophyllum inophyllum and Calophyllum soulattri. Inophinnin (1) and inophinone (2) were isolated from Calophyllum inophyllum while soulattrin (3) and phylattrin (4) were found from Calophyllum soulattri. The other xanthones were from both Calophyllum sp. and they are pyranojacareubin (5), rheediaxanthone A (6), macluraxanthone (7), 4-hydroxyxanthone (8), caloxanthone C (9), brasixanthone B (10) and trapezifolixanthone (11). Compound 3 was found to be the most cytotoxic towards all the cancer cell lines with an IC50 value of 1.25μg/mL while the simplest xanthone, compound 8 was inactive.
Insights
Eleven xanthones from Calophyllum species were tested for anticancer activity. Soulattrin (3) showed significant cytotoxicity against four cancer cell lines, while 4-hydroxyxanthone (8) was inactive.
Area of Science:
- Natural Product Chemistry
- Medicinal Chemistry
- Pharmacology
Background:
- Xanthones are a class of natural compounds with diverse biological activities.
- Calophyllum species are known sources of bioactive secondary metabolites, including xanthones.
- Understanding structure-activity relationships (SAR) is crucial for developing new anticancer agents.
Purpose of the Study:
- To investigate the antiproliferative activity of eleven xanthones isolated from Calophyllum inophyllum and Calophyllum soulattri.
- To establish the structure-activity relationships of these xanthones against various cancer cell lines.
- To identify potent cytotoxic xanthones for potential anticancer drug development.
Main Methods:
- Isolation and characterization of eleven xanthones from the stem bark of Calophyllum species.
- Antiproliferative assay of the isolated xanthones against four human cancer cell lines: Raji (B-lymphocyte), LS174T (colon carcinoma), IMR-32 (neuroblastoma), and SK-MEL-28 (skin carcinoma).
- Determination of IC50 values to quantify cytotoxicity.
Main Results:
- Soulattrin (3) exhibited the highest cytotoxicity across all tested cancer cell lines, with an IC50 value of 1.25 μg/mL.
- Inophinnin (1), inophinone (2), soulattrin (3), and phylattrin (4) were isolated from C. inophyllum and C. soulattri respectively.
- The other seven xanthones (5-11) were isolated from both Calophyllum species.
- 4-hydroxyxanthone (8), the simplest xanthone, showed no significant antiproliferative activity.
Conclusions:
- Soulattrin (3) is a potent cytotoxic agent against the evaluated cancer cell lines and warrants further investigation for anticancer drug development.
- The study highlights the potential of xanthones from Calophyllum species as a source of novel anticancer compounds.
- SAR analysis suggests that specific structural features of xanthones are critical for their cytotoxic activity.
