Recruitment of cells and mediators is altered during impaired wound healing, thereby delaying this process. To overcome this problem, the correlation of wound healing in older rats, and the impact of different molecular weight of hyaluronan without silver nanoparticles; (low-HA1), (High-HA2), (Medium- HA3) and with silver nanoparticles (High-HA4) is investigated. The superior HA were selected to be further investigated onto diabetic wounds. Our results pointed to a marked deficiency in wounds granulation in older rats, which was accompanied with impairment of healing process. In older rats group treated with HA2 or HA4, granulation and dermal construction were improved. Furthermore, the number of pathogenic bacteria on wounds was declined throughout the first 24h by HA2 and HA4. The wound size in HA4-treated older rats was significantly smaller than that in other HA1, HA2 or HA3-treated older ones. Also, diabetes impaired the level of inflammatory cytokine, in diabetic model. On contrary, HA4 was found to normalize the level of inflammatory cytokine, in the diabetic model. Furthermore, HA4 was found to recover all oxidative and toxicity markers in diabetic models. This data confirms the critical role of HA4 to improve granulation and inflammatory mediators in impaired older and diabetic rat wound healing.

CEITEC Central European Institute of Technology Brno University of Technology Technicka 3058 10 616 00 Brno Czech Republic; SCITEG a s Brno Czech Republic; Faculty of Chemistry Institute of Materials Chemistry Brno University of Technology Technicka 3058 10 616 00 Brno Czech Republic

CEITEC Central European Institute of Technology Brno University of Technology Technicka 3058 10 616 00 Brno Czech Republic; SCITEG a s Brno Czech Republic; National Research Centre Textile Research Division Pre treatment and Finishing of Cellulosic Fibers Dokki P O 12311 Cairo Egypt

Chemistry Department College of Science King Saud University P O Box 2455 Riyadh 11451 Saudi Arabia; Department of Chemistry Faculty of Science Alexandria University P O Box 426 Ibrahimia Alexandria 21321 Egypt

Chemistry Department College of Science King Saud University P O Box 2455 Riyadh 11451 Saudi Arabia; National Research Centre Textile Research Division Pre treatment and Finishing of Cellulosic Fibers Dokki P O 12311 Cairo Egypt

Department of Zoology College of Science King Saud University P O Box 2455 Riyadh 11451 Saudi Arabia

Department of Zoology College of Science King Saud University P O Box 2455 Riyadh 11451 Saudi Arabia; Department of Zoology Faculty of Science El Minia University Egypt

Department of Zoology Faculty of Science El Minia University Egypt

Institute of Organic Chemistry and Technology Faculty of Chemical Technology University of Pardubice Studentská 573 Pardubice CZ 532 10 Czech Republic

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Marine Biomaterials: Hyaluronan