ABSTRACT
The enteric pathogens and oxidative stress are known to generate intestinal inflammation, chronic gut ailments and oncogenesis. Modulation of the gut microbial peak populations through herbal agents, offers a promising therapeutic modality. Tribulus terrestris Linn. (Tt), a widely documented medicinal herb in Ayurveda, was investigated for antioxidant, anti-inflammatory and antimicrobial activities in vitro. Fruit extract of Tt and quercetin, evaluated for free radical scavenging by DPPH method, revealed IC50 values as 98.83 and 24.77 µg/mL, respectively. Anti-inflammatory attributes of Tt fruit extract and indomethacin, a known anti-inflammatory drug, rendered IC50 values as 10.8 and 12.9 µg/mL against protein denaturation. MTT assay on HCT-15 cells revealed a decrease in viability from 78 to 22% against 30 and 70 µg/mL of Tt fruit extract, respectively. Zone of inhibition against E. coli increased from 0.19 to 9.82 cm2 at 200 and 1000 µg/mL of Tt, respectively. The fruit extract of Tt enhanced the growth of probiotic Lactobacillus rhamnosus (L.rh) by 19, 44 and 50 % over the control at 100, 150 and 200 µg/mL, respectively. This study indicated the potential of Tribulus terrestris fruit extract against inflammatory, oxidative and microbe generated pathogenic ailments in the digestive system.
ABSTRACT
In this study, we investigated few dietary cucurbits for anticancer activity by monitoring cytotoxic (MTT and LDH assays), apoptotic (caspase-3 and annexin-V assays), and also their anti-inflammatory effects by IL-8 cytokine assay. Aqua-alcoholic (50:50) whole extracts of cucurbits [Lagenaria siceraria (Ls), Luffa cylindrica (Lc) and Cucurbita pepo (Cp)] were evaluated in colon cancer cells (HT-29 and HCT-15) and were compared with isolated biomolecule, cucurbitacin-B (Cbit-B). MTT and LDH assays revealed that the cucurbit extracts and Cbit-B, in a concentration dependent manner, decreased the viability of HT-29 and HCT-15 cells substantially. The viability of lymphocytes was, however, only marginally decreased, yielding a potential advantage over the tumor cells. Caspase-3 assay revealed maximum apoptosis with Ls while annexin V assay demonstrated maximum efficacy of Lc in this context. These cucurbits have also shown decreased secretion of IL-8, thereby revealing their anti-inflammatory capability. The results have demonstrated the therapeutic potential of dietary cucurbits in inhibiting cancer and inflammatory cytokine.