getpdf  NLM PubMed Logo https://doi.org/10.17113/ftb.57.03.19.6028


Free Radical Scavenging Properties and Induction of Apoptotic Effects of FA Fraction Obtained after Proteolysis of Bioactive 
Peptides from Microalgae Synechococcus sp. VDW


Rutairat Suttisuwan1orcid tiny, Saranya Phunpruch2,3
orcid tiny, Tanatorn Saisavoey4orcid tiny, Papassara Sangtanoo4orcid tiny, Nuttha Thongchul4,5orcid tiny and
Aphichart Karnchanatat4,5*
orcid tiny


1Program in Biotechnology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
2Department of Biology, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
3Bioenergy Research Unit, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
4Institute of Biotechnology and Genetic Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
5Research Unit in Bioconversion/ Bioseparation for Value-Added Chemical Production, Institute of Biotechnology and Genetic Engineering, Chulalongkorn University,
  254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand




Article history:
Received: 7 September 2018
Accepted: 17 June 2019
cc




Key words:
antioxidant, apoptosis, cancer, protein hydrolysate, Synechococcus sp. VDW, SW620 cell line




Summary:
This study aims to determine the antioxidant activity of bioactive peptides derived from Synechococcus sp. VDW cells cultured for 21 days. Synechococcus sp. VDW protein hydrolysates were prepared with trypsin and purified by ultrafiltration with molecular mass cut-off membranes of 10, 5 and 3 kDa. The M<3 kDa (FA) fraction had the highest 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and 2,2’-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities, with IC50 values of (11.5±0.3) and (13.6±0.2) µg/
mL, respectively. The FA fraction was separated by reversed phase HPLC to yield four subfractions (F1–4). The F4 subfraction showed the highest maximum ABTS radical scavenging activity (3.55±0.61) % and it was selected for further analysis by electrospray ionisation quadrupole time-of-flight mass spectrometry (ESI-Q-TOF-MS/MS) based on de novo peptide sequencing. Five antioxidant peptides were identified, of which AILESYSAGKTK had the highest ABTS radical scavenging activity. Furthermore, the FA fraction showed high cytotoxic activities against human cancer-derived cell lines, especially the colon cancer cell line (SW620) with an IC50 value of (106.6±21.5) µg/mL, but not the untransformed Wi38 cell line. The FA fraction activated the apoptotic pathway in SW620 cells after treatment for 24, 48 and 72 h, with the highest activities of caspases-3, -8 and -9 being observed after treatment for 72 h. These findings suggested that microalgae Synechococcus sp. VDW may be used to develop natural anticancer drugs.






*Corresponding author:  tel3
  +6622188078
                                            fax2  +6622188069
                                            email2  Aphichart.K@chula.ac.th

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