AUTHOR=Gamal-Eldeen Amira M. , Raafat Bassem M. , Alrehaili Amani A. , El-Daly Sherien M. , Hawsawi Nahed , Banjer Hamsa J. , Raafat Eman M. , Almehmadi Mazen M. 

TITLE=Anti-hypoxic Effect of Polysaccharide Extract of Brown Seaweed Sargassum dentifolium in Tongue Squamous Cell Carcinoma

JOURNAL=Frontiers in Nutrition

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2022.854780

DOI=10.3389/fnut.2022.854780

ISSN=2296-861X

ABSTRACT=<p><italic>Sargassum dentifolium</italic>, (Turner) C. Agarth, 1820, is an edible brown alga collected from red seashores, Egypt. Oral tongue squamous cell carcinoma (OTSCC) is an aggressive malignancy. Hypoxia leads to chemotherapeutic resistance. This work aimed to explore the anti-hypoxia effect of water-soluble polysaccharide fractions of <italic>S. dentifolium</italic> (SD1–SD3) in CAL-27 OTSCC cells. Cell cytotoxicity assay (MTT); cell death mode (DNA staining); total hypoxia (pimonidazole), HIF-1α (ELISA and immunocytochemistry), HIF-1β (ELISA), and hsa-miRNA-21-5p and hsa-miRNA-210-3p (qRT-PCR) were investigated. SD1 and SD2 showed a cytotoxic effect due to apoptosis. SD2 and SD3 decreased total cell hypoxia, inhibited miR-210 (<italic>p</italic> &lt; 0.001 and <italic>p</italic> &lt; 0.01), miR-21 (<italic>p</italic> &lt; 0.01 and <italic>p</italic> &lt; 0.05), and HIF-1α (<italic>p</italic> &lt; 0.01 and <italic>p</italic> &lt; 0.05), respectively. However, only SD3 suppressed HIF-1β (<italic>p</italic> &lt; 0.05). In conclusion, SD2 showed a potential anti-hypoxia effect through amelioration of HIF-1α regulators, which may help in decreasing hypoxia-induced therapeutic resistance.</p>