Systematically optimized coenzyme q10-loaded novel proniosomal formulation for treatment of photo-induced aging in mice: characterization, biocompatibility studies, biochemical estimations and anti-aging evaluation.

Environmental stress and advancing age is considered as the main cause of skin aging. However, environmental stress (especially UV radiations) accelerates the process of skin aging by manifolds. Coenzyme Q10 (CoQ10), an essential compound of cellular bioenergetics also acts as a strong antioxidant and protects the body against aging. High molecular weight and structure specific lipophilic nature of this molecule is a bottle neck in effective delivery through topical route. Preparation of a novel proniosomal (PN) gel formulation of CoQ10 employing systematic design of experiment (DoE) approach is a step ahead in transcending the constraints of the topical delivery. I-optimal mixture design was employed for systematic optimization of proniosomal formulation and evaluation of experimental data was performed for entrapment efficiency and in vitro release. Hydration of PN gel formulation with phosphate buffer (pH 7.5) results in submicron niosomes vesicles of spherical shape, which appeared dark against bright surroundings in TEM study. Animal skin was treated with UV radiations followed by treatment of PN gel CoQ10 and conventional CoQ10 present in a gel base. The effectiveness of the treatment was evaluated on the basis of biochemical estimation and histopathological studies. By using CoQ10 PN gel formulation, levels of superoxide dismutase (SOD), catalase (CA), glutathione (GSH) and total proteins were restored by 81.3%, 72.1%, 74.8 and 77.1%, respectively to that of control group. Histopathological studies revealed better protection of skin treated with CoQ10 PN gel compared to free CoQ10. Prepared PN gel was found undisturbing with the normal histology hence, tolerated by animal skin compare to conventional gel.