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Background: Sponges are champion of bioactive producers because of the variety of products that have been found from them. Most bioactive compounds extracted from sponges were classified into antibiotic, antiviral, antitumor, and anti-inflammatory. Tow marine sponge species were collected during winter 2016 from Gulf of Aqaba, Red Sea, Egypt viz., Callyspongia crassa and Callyspongia siphonella. The collected sponge species belong to family Callyspongiidae. The sponge samples were extracted by ethanol and investigated as a promising source of natural products which can be used as antitumor, antiviral, and antimicrobial, antioxidant, and anti-inflammatory agents. Results: Results revealed that the crude extract of C. siphonella showed high antitumor activity with value of 5.57 and 1.39 μg/ml as IC50 against colon cancer (caco-2) and breast cancer (Mcf-7) on cell line, respectively. Also the C. crassa extract showed high cytotoxic effect to Vero cell with HAV (hepatitis A virus), which exhibits that MIC was 9.765 μg/ml, the most effective extract was of C. crassa against Escherichia coli, Pseudomonas aeruginosa, and Candida albicans. Also, ethanolic crude of C. siphonella showed positive antibacterial activity against P. aueroginosa. Indeed, there much other extracts exhibited no antibacterial activities, especially all extracts against Staphylococcus aureus and Vibrio damsela. The C. crassa extract conducted an antioxidant activity in corresponding to ascorbic acid standard with value of 671 μg/ml as IC50. There was only one crude extract that had anti-inflammatory activity; it was of C. crassa (61.47%). Conclusions: The present investigation confirmed that the crude extract of C. siphonella conducted to promising antitumor agent against colon and breast cancer, while the crude extract of C. crassa conducted to promising anti-inflammatory and antiviral agents. In summary, the marine sponges are an indispensable, chemodiverse, biodiverse, and rich source of natural products and secondary metabolites with potent pharmacological effects. The studies should be interested with spongederived bioactive compounds as a promising strategy that deserves further attention in future investigations in order to address the limitations regarding sustainable supply of marine drugs.

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Bioactive constituents of numerous marine organisms have been investigated recently for their preclinical and clinical anticancer activity. Three marine organisms: black-spotted sea cucumber: Pearsonothuria graeffei (Pg), lollyfish: Holothuria atra (Ha), and sea hare: Aplysia dactylomela (Ad), were collected during winter 2019 from Gulf of Aqaba, Red Sea, Egypt, and macerated with ethanol into three different extracts: PgE, HaE, and AdE, where each was in vitro assessed for its antiproliferative and proapoptotic properties on HepG2, HCT-116, and MCF-7 cancer cells. PgE dose-dependently inhibited the growth of HepG2, HCT-116, and MCF-7 cells within IC50 values 16.22, 13.34, and 18.09 μg/mL, respectively, while the IC50 values for the antiproliferative activity of HaE were 12.48, 10.45, and 10.36 μg/mL, respectively, and the IC50 values of AdE were 6.51, 5.33, and 6.87 μg/mL, respectively. All extracts were found to induce G0/G1 cell cycle arrest for HepG2 cells side by side with their inhibition of CDK2 on all three cell lines while all extracts were also showed to induce apoptosis in HepG2 cell line at pre-G1 phase supplemented by their anticancer activity via proapoptotic protein Bax, caspase-3, and cleavage PARP increase, and antiapoptotic protein Bcl-2 downturn. Moreover, necrosis has been relatively noticed in HepG2 cell line as an additional anticancer activity for each extract. Our data introduced three ethanolic marine extracts as natural chemotherapeutic agents to be further developed for cancer control.

Many marine organisms have been used as sources of medicines and primary products (Hasaballah and El-Naggar 2017). The Red Sea and its two gulfs (Aqaba and Suez) is one of the most important storehouses of global marine biodiversity (El-Naggar et al., 2017 and Mona et al., 2019).Aquatic organisms are considered as a source for huge numbers of bioactive compounds and secondary metabolites that attract the attentions of biologists, pharmacist and chemists as a result of their potential activities as anticancer, antimicrobial, antiviral, anti-fungal and so on (El-Naggar and Hasaballah, 2018; Elnagar et al., 2018). They are facing many of environmental challenges such as competition on space and nutrition, predation and self-defense etc., all these challenges stimulate aquatic organisms to produce secondary metabolites to cope it (El-Damhougy et al., 2017a; Ibrahim et al.,