Bacterial infections are the key cause of death in patients suffering from burns and diabetic wounds while the use of traditional antibiotics has been growing steadily. Thus, in the present study, we are trying to introduce a paradigm shift strategy to improve chronic wound healing of bacterial infection. To that end, we have biologically synthesized silver nanoparticles (AgNPs) using Arthrospira sp polysaccharides, and evaluated their antibacterial efficacy with their safety pattern. Scanning electron micrographs showed spherical AgNPs coated with algal polysaccharides with an approximate size of 9.7 nm. Treatment of Pseudomonas aeruginosa with the AgNPs (0.5–1 μg/mL) resulted in a significant disruption in P. aeruginosa outer membrane, reduction in biofilm formation, and a significant decrease of production of alginate and pyocyanin along with a concentration-dependent reduction in β-lactamase activity. In addition, at the in vivo level, AgNPs displayed substantial activity to control P. aeruginosa infections in rat skin wounds with significant reduction in in COX-2 enzyme in both rat skin homogenate and serum samples. Furthermore, AgNPs facilitated wound curative in the P. aeruginosa infected model by reducing the hemorrhagic areas number and the infiltrated inflammatory cells. Taken all together, these biogenic nanoparticles showed unique properties in controlling bacterial wound infections and improving the healing process of damaged tissues via its direct and indirect effects.

This work aimed to study the influence of gamma radiation on the growth and production of some active substances of Arthrospira platensis. Biomass production was significantly inhibited (p ≤ 0.05)

Biogenic Silver nanoparticles (AgNPs) are one of the most fascinating nanomaterials used in biomedical purposes. In the current study, we biosynthesized AgNPs using Arthrospira platensis, Microcystis aeruginosa and Chlorella vulgarisactive metabolites and evaluate their efficacy against breast cancer. The recovered AgNPs was characterized using scanning and transmission electron microscopy (SEM and TEM). The safety usage of bio-AgNPs was tested in-vitro on PBMCs cells and in-vivo. The obtained results indicated the safety usage of bio-AgNPs at concentration 0.1 mg/ml on PBMCs cells and 1.5mg/ml on the tested Albino mice. The bio-AgNPs displayed dose-dependent cytotoxicity (0.1 mg/ml) against HepG-2, CaCO-2 and MCF-7 cell lines via ROS induction and arresting treated cells in G0/G1 and sub G0 phases. In addition, Arthrospira bio-AgNPs treatment induced cellular apoptosis in breast cancer cells via the down regulation of survivin, MMP7, TGF and Bcl2 genes expressions. Upon Arthrospira bio-AgNPs treatment, a great delay in tumor growth and prolonged survival were recorded in breast cancer mice model. Furthermore, after Arthrospira bio-AgNPs treatment, a great reduction in Ki 67 protein marker from 60% to be 20% and was recorded and an elevation in Caspase 3 protein levels was recorded in treated groups with percentage 65% comparing with 45% in Doxorubicin treated groups.

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Biogenic Silver Nanoparticle (bio-AgNPs) is one of the most fascinating nanomaterials used in the biomedical purposes. In the current study, we biosynthesized AgNPs (bio-AgNPs) using Arthrospira platensis(A-bio-AgNPs), Microcystis aeruginosa(M-bio-AgNPs)and Chlorella vulgaris(C-bio-AgNPs) active metabolites and evaluated their anticancer efficacy against breast cancer. The recovered bio-AgNPs were characterized using Scanning and Transmission Electron Microscopy (SEM and TEM) and their safety profiles were monitoring in-vitro on PBMCs cells and in-vivo on Albino mice. The obtained results indicated the safety usage of bio-AgNPs at concentration of 0.1 mg/ml on PBMCs cells and 1.5mg/ml on the Albino mice. The bio-AgNPs displayed dose-dependent cytotoxic effects against HepG-2, CaCO-2 and MCF-7 cell lines by inducing ROS and arresting the treated cells in G0/G1 and sub G0 phases. In addition, A-bio-AgNPs induced breast cancer cellular apoptosis by down regulating the expression of survivin, MMP7, TGF and Bcl2 genes. Upon A-bio-AgNPs treatment, a significant reduction in tumor growth and prolonged survival rates were recorded in breast cancer BALB/c model. Furthermore, A-bio-AgNPs treatment significant decreased theKi 67 protein marker from 60% (in the untreated group) to 20% and increased Caspase 3 protein levels to 65% (in treated groups) comparing with 45% (in Doxorubicin treated groups).