Saponin-enriched extracts from body wall and Cuvierian tubule of Holothuria leucospilota reduce fat accumulation and suppress lipogenesis in Caenorhabditis elegans.

Saponins have been shown to possess many pharmacological properties, including altered fat metabolism. The black sea cucumber, Holothuria leucospilota, is a marine animal that contains a specialized organ called a Cuvierian tubule that produces and secrete the bioactive saponins into the tubules and body wall. Therefore, the aims of this study are to investigate the anti-obesity effect of saponins extracted from body wall and Cuvierian tubules of H. leucospilota. The butanol extracts of H. leucospilota body wall and Cuvierian tubules containing high amounts of saponins significantly reduced fat deposition and triglyceride levels in Caenorhabditis elegans fed with 50 mmol L-1 glucose. Moreover, the saponin-enriched extracts of H. leucospilota significantly restored the lifespan of 2% glucose-fed worms (18.71%). Green fluorescence protein-labeled sbp-1 gene expression and nuclear translocation of daf-16 were also significantly decreased in H. leucospilota treatment. The saponin-enriched extracts downregulated the messenger RNA expressions of genes involved in fat storage and metabolism, including sbp-1, cebp, and daf-16 but upregulated the expression of nhr-49 gene. Our results suggest that H. leucospilota-derived saponins may mediate the reduction of glucose-induced fat accumulation through sbp-1, cebp, daf-16 and nhr-9 pathways. Therefore, the H. leucospilota extracts could be used as nutraceuticals for anti-obesity prevention. © 2019 Society of Chemical Industry.

Chumphoochai K ，Chalorak P ，Suphamungmee W ，Sobhon P ，Meemon K ... -  《-》

Anti-Parkinson activity of bioactive substances extracted from Holothuria leucospilota.

Parkinson's disease (PD) is a well-known neurodegenerative disorder characterized by dopaminergic (DA) neuron loss and α-synuclein aggregation. Recent study revealed that the extracts from sea cucumber, Holothuroidea spp., exhibited neuroprotective and lifespan extension effects in Caenorhabditis elegans model. Interestingly, the black sea cucumber, Holothuria leucospilota, possesses body wall and a specialized organ called cuvierian tubules containing high amount of bioactive compounds. In this study, the neuroprotective effects of the body wall (BW) and cuvierian tubules (CT) from this sea cucumber against PD were evaluated using C. elegans as a model. H. leucospilota were extracted using ethanol (ET), ethyl acetate (EA), butanol (BU) and aqueous (AQ) fractions. Extracts from these fractions were used to treat the 6-OHDA-induced BZ555 and α-synuclein expressing NL5901 strains of C. elegans. Treatment with ET, EA, BU and AQ fractions of H. leucospilota extracts could significantly prevent degeneration of DA neurons in 6-OHDA-induced worms, improve food-sensing behavior mediated by DA neurons, and up-regulate cat-2 and sod-3 gene expressions. These results indicate the neuroprotective activity of the extracts which may be attributed to the anti-oxidant activity of the bioactive compounds. Moreover, α-synuclein aggregation was significantly reduced together with the recovery of lipid deposition upon the treatment with H. leucospilota extracts. In addition, treatment with H. leucospilota extracts was able to increase the lifespan of 6-OHDA-induced N2. NMR analysis revealed the major chemical components in the effective EA fractions were terpenoids, steroids, saponins, and glycosides. In summary, H. leucospilota extracts exhibited anti-Parkinson effect in both toxin-induced and transgenic C. elegans models of PD. Further study will be performed to elucidate the most effective anti-PD molecules which will lead to the development of anti-PD drug.

Malaiwong N ，Chalorak P ，Jattujan P ，Manohong P ，Niamnont N ，Suphamungmee W ，Sobhon P ，Meemon K ... -  《-》

Saponin-rich extracts from Holothuria leucospilota mediate lifespan extension and stress resistance in Caenorhabditis elegans via daf-16.

Saponins are secondary metabolite compounds that can be found in sea cucumbers (Holothuroidea spp.). However, little is known about how saponin-rich extracts from Holothuria leucospilota can delay and prolong the lifespan of the whole organism. In this study, anti-aging effects of H. leucospilota extracts were studied on Caenorhabditis elegans. NMR analysis revealed that body wall n-butanol-extract of H. leucospilota (BW-BU) is saponin-rich. BW-BU extracts exhibited antioxidant activities by 2,2'-diphenyl-2-picrylhydrazyl assay (EC50  = 10.23 ± 0.12 mg/ml) and 2,2'-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid assay (EC50  = 3.91 ± 0.04 mg/ml). BW-BU extracts increased lifespan of L4 and L1 C. elegans (5.92% and 15.76%, respectively), which also increased worm growth, stress resistance, and reduced biomarkers for aging. BW-BU extracts activated DAF-16 nuclear localization and upregulated daf-16 and DAF-16 target genes expression. Taken together, this study revealed the evidences on anti-aging activities of saponin-rich extracts from H. leucospilota, which can extend lifespan of C. elegans via daf-16. PRACTICAL APPLICATIONS: In recent years, age-associated chronic diseases have had a significant impact on quality of life. Many natural compounds exhibit anti-aging activities, especially in sea cucumber, H. leucospilota. Our results indicated that H. leucospilota is good for health. Extracts from H. leucospilota contain a bioactive compound that can be potentially used to promote longevity and disease prevention in aging.

Kitisin T ，Suphamungmee W ，Meemon K 《-》

Effects of Momordica saponin extract on alleviating fat accumulation in Caenorhabditis elegans.

Lin C ，Lin Y ，Chen Y ，Xu J ，Li J ，Cao Y ，Su Z ，Chen Y ... -  《-》

Holothuria scabra extracts possess anti-oxidant activity and promote stress resistance and lifespan extension in Caenorhabditis elegans.

Holothuria scabra is a sea cucumber that is mostly found in the Indo-Pacific region including Thailand. Extracts from many sea cucumbers possess pharmacological activities proposed to benefit human health. In this study, we investigated the anti-oxidant and anti-ageing activities of extracts from H. scabra by using Caenorhabditis elegans as a model organism. Parts of H. scabra were solvent-extracted and divided into nine fractions including whole body-hexane (WBHE), whole body-ethyl acetate (WBEA), whole body-butanol (WBBU), body wall-hexane (BWHE), body wall-ethyl acetate (BWEA), body wall-butanol (BWBU), viscera-hexane (VIHE), viscera-ethyl acetate (VIEA), and viscera-butanol (VIBU). All fractions of the extracts were tested for anti-oxidant activities by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assays and for anti-ageing effects by lifespan assays using C. elegans as a model. The results showed anti-oxidant properties in all fractions with the highest activity shown by the DPPH assay in WBBU (EC50 = 3.12 ± 0.09 mg/ml), and by the ABTS assay in WBHE (EC50 = 0.31 ± 0.10 mg/ml). In lifespan assays the highest anti-ageing effect was detected in WBBU- and BWEA-treated C. elegans with increased mean lifespans of 8.12% and 4.77%, respectively. Furthermore, WBBU and BWEA-treated C. elegans exhibited significantly higher resistance against heat shock and paraquat-induced oxidative stresses than controls. By using LC-MS/MS, both extracts were characterized to contain triterpene glycosides as the main bioactive components. To explore mechanisms of H. scabra extracts on longevity and stress resistance, worms with genetic mutations in anti-ageing pathways were analyzed and showed that WBBU and BWEA did not prolong the lifespan of daf-16, age-1, sir-2.1, jnk-1, sek-1, and osr-1 mutants, suggesting that these genetic pathways are involved in mediating the anti-ageing effects of the H. scabra extracts. Moreover, WBBU and BWEA enhanced the nuclear translocation of the FoxO/DAF-16 transcription factor, and increased mRNA expression of this gene and its downstream targets sod-3, hsp12.3, and hsp16.2. In conclusion, this study strongly demonstrates anti-oxidant and anti-ageing properties of H. scabra extracts containing triterpene glycosides, which, in the C. elegans model, may be mediated via the insulin/IGF-1 signaling (IIS)-DAF-16 pathway.

Jattujan P ，Chalorak P ，Siangcham T ，Sangpairoj K ，Nobsathian S ，Poomtong T ，Sobhon P ，Meemon K ... -  《-》