Biography
Ji-Geng Yan MD, PhD is an Associate Professor and Director of Research Laboratory and Reconstructive Surgery at Medical College of Wisconsin, USA.
Abstract
After a nerve injury, calcium concentration in the intra-nerve fiber drastically increases. The purpose of our study was to test an implantable micro-osmotic pump to deliver medications to accelerate calcium absorption, thereby greatly improving nerve regeneration. Twenty-four SD rats were divided into four groups of six each: 1) Sham control: crush injury to sciatic nerve only; 2) Crush injury with a Nifedipine pump; 3) Crush injury with a Calcitonin pump; 4) Crush injury with a Saline pump. Each rat’s right sciatic nerve was crushed. The micro-osmotic pump was implanted in the neck, and the dripping tube was routed to the injured nerve. After four weeks of survival time, compound muscle action potential (CMAP), tetanic muscle force (TMF), myelinated nerve fiber area (NFA), nerve calcium concentration (NCC), and calcified spots (CS) were evaluated. The calcium absorption rate (CAR) was also determined. The order from highest to lowest recovery rate was Nifedipine> Calcitonin > Sham control > Saline. Differences among the groups were statistically significant (P < 0.001, ANOVA Test), and the difference between Nifedipine/Calcitonin and Saline/Sham control were all statistically significant (P< 0.001, t-test). The correlation rate of NCC with CMAP/TMF and with NFA/CS and CAR were calculated to be 0.99 (all P < 0.001, Pearson’s Correlation). We conclude from this study that nerve regeneration strongly correlated with calcium absorption; our new data has shown greatly improved nerve functional recovery, and this can potentially be translated into clinical applications.
Biography
Nesrine M Hegazi has completed her MSc in 2008 and PhD in 2014 from the Faculty of Pharmacy, Ain Shams University, in Egypt. She joined a research team in the National Research Center in Cairo, and has participated in various conjoint products with German Universities. She has participated in various international conferences and workshops and published in reputable journals in addition to being a reviewer in the Arabian Journal of Chemistry.
Abstract
Phenolics and their glycosides have received during the last few decades, an increasing attention from chemists and pharmacologists. Previous comprehensive studies proved that plant phenols possess diverse effect on biological systems. The diversity of their structures is the basis of the recent increase in the detection of the various biological and pharmacological activities which have been extensively researched such as antitumor, antibacterial, enzyme inhibitory, anti-hepatotoxic, antioxidant, anti-allergic, anti-inflammatory, anti-osteoporotic, analgesic, antiviral and immunomodulating. These abilities make polyphenols interesting for the treatment of various diseases like inflammation or cancer, but also for anti-ageing purposes in cosmetic formulations, or for nutraceutical applications. Unfortunately, these compounds lack long-term stability as they are very sensitive to light and heat. Moreover, polyphenols often present a poor biodisponibility mainly due to low water solubility. Lastly, many of these molecules possess a very astringent and bitter taste, which limits their use in food or in oral medications. To circumvent these drawbacks, delivery systems have been developed, and among them, encapsulation would appear to be a promising approach. Therefore, the administration of phenolic compounds requires the formulation of a finished protecting product able to maintain the structural integrity of the polyphenol until the consumption or the administration, mask its taste, increase its water solubility and bioavailability, and convey it precisely towards a physiological target. Among the existing stabilization methods, encapsulation is an interesting means. The use of encapsulated polyphenols instead of free compounds was the source of numerous works.