OBJECTIVE:To optimize Azelastine hydrochloride (AH) thermosensitive in-situ gel nasal drops formulation. METHODS:Using poloxamer 407(P407)and poloxamer 188(P188)as excipients,AH thermosensitive in-situ gel was prepared by cold solution method. The formulation was optimized by central composite design-response surface methodology using the amount of P407 and P188(g/100 ml)as factors and phase-transition temperature as index. Binomial expression was fitted,and pre-dicted and measured values were compared. RESULTS:The correlation coefficient R2 fitted by binomial expression was equal to 0.986 5. The optimal formulation was as follows as P407 for 20.414 4%,P188 for 5.035 4%,measured value of(30.81±0.02)℃, predicted values of 31 ℃,deviation of 0.61%. CONCLUSIONS:AH thermosensitive in-situ gel nasal drops formulation is opti-mized by central composite design-response surface methodology.

Background and Objectives: Human umbilical cord mesenchymal stem cells (HUC-MSCs) are promising candidates for cell-based therapy in regenerative medicine or other diseases due to their superior characteristics, including higher proliferation, faster self-renewal ability, lower immunogenicity, a noninvasive harvest procedure, easy expansion in vitro, and ethical access, compared with stem cells from other sources. Methods: and Results: In the present study, we knocked down the expression of SOX9 in HUC-MSCs by lentivirus interference and found that knockdown of SOX9 inhibited the proliferation and migration of HUC-MSCs and influenced the expression of cytokines (IL-6 and IL-8), growth factors (GM-CSF and VEGF) and stemness-related genes (OCT4 and SALL4). In addition, the repair effect of skin with burn injury in rats treated with HUC-MSCs transfected with sh-control was better than that rats treated with HUC-MSCs transfected with shSOX9 or PBS, and the accessory structures of the skin, including hair follicles and glands, were greater than those in the other groups. We found that knockdown of the expression of SOX9 obviously inhibited the expression of Ki67, CK14 and CK18. Conclusions In conclusion, this study will provide a guide for modifying HUC-MSCs by bioengineering technology in the future.