The study evaluated the therapeutic potential of ethanolic leaf extract of Piliostigma foveolatum (Dalzell) Thoth. (EEBF), its toluene, ethylacetate, methanol soluble fractions (viz. TFBF, EFBF, MFBF), and isolated phytoconstituents against lung cancer. Four compounds were isolated from MFBF by column chromatography and preparative HPLC. Structures were elucidated by IR, 13 C-NMR, 1 H-NMR, mass spectroscopy and identified as Quercetin, Kaempferol, Isorhamnetin, and ß-glucogallin. EEBF and its biofractions exhibited remarkable antiproliferative activity with GI50<85µg/mL, while isolated Quercetin, Kaempferol, Isorhamnetin, and ß-glucogallin displayed GI50 values of 56.15±1.16µM, 68.41±3.98µM, 55.08±0.57µM and 58.99±12.39µM respectively. MFBF demonstrated significant apoptotic activity with 42.24±0.57% cells in early and 4.61±0.88% cells in late apoptosis comparable to standard Doxorubicin. Kaempferol exhibited 23.03±0.37% cells in early and 2.11±0.55% cells in late apoptosis, arresting Hop-62 cells in S-phase. In silico molecular docking, revealed that isolated constituents effectively bound to the same binding site of caspase-3 as Doxorubicin, highlighting their apoptotic mode of action.
The current study was designed to evaluate the antioxidant and anticancer potential of ethanolic leaf extract of Bauhinia foveolata Dalzell. (EEBF) and its toluene, ethyl acetate and methanolic biofractions viz., TFBF, EFBF and MFBF. Phytoconstituents were screened by adopting established procedures. Total phenolic and flavonoid content were assessed spectrophotometrically. In vitro antioxidant activity was assayed using DPPH (2,2-diphenyl-1-picrylhydrazyl), hydrogen peroxide and nitric oxide as free radicals, whereas anticancer activity was evaluated using sulforhodamine B assay. EEBF showed maximum phenolic content of 49.12±0.31 mg GAE/g and flavonoidal content of 28.75±0.42 mg QUE/g, than its biofractions. EEBF showed considerable antioxidant activity with IC50=19.04±0.24 μg/mL and IC50=65.85±1.22 μg/mL when compared to the standards Ascorbic acid (IC50=12.06±0.05 μg/mL) and Gallic acid (IC50=64.65±0.72 μg/mL) in DPPH and nitric oxide scavenging assays, respectively. MFBF showed significant activity with IC50=26.76±0.75 μg/mL in hydrogen peroxide scavenging assay compared to the standard Gallic acid (IC50=76.60±1.31 μg/mL). TFBF showed favourable growth inhibition of MCF-7 cells with GI50=73.5±11.96 µg/mL when compared to other samples screened (GI50>80 μg/mL) as against the standard Adriamycin (GI50<10 μg/mL) in SRB assay. The therapeutic virtues of EEBF and MFBF as free radical scavengers and TFBF as an antiproliferative may be attributed to the phenolics, flavonoids, steroids and triterpenoids present.
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