RESUMEN
Triptolide (TP), a major active component of Tripterygium wilfordii Hook.F. (TWHF), is used to treat rheumatoid arthritis (RA). However, it has a narrow therapeutic window due to its serious toxicities. To increase the therapeutic index, a new triptolide-loaded transdermal delivery system, named triptolide-loaded liposome hydrogel patch (TP-LHP), has been developed. In this paper, we used a micro-needle array to deliver TP-LHP to promote transdermal absorption and evaluated this treatment on the pharmacokinetics and pharmacodynamics of TP-LHP in a rat model of collagen-induced arthritis (CIA). The pharmacokinetic results showed that transdermal delivery of microneedle TP-LHP yielded plasma drug levels which fit a one-compartment open model. The relationship equation between plasma concentration and time was C=303.59×(e(-0.064t) -e(-0.287t) ). The results of pharmacodynamic study demonstrated that TP-LHP treatment mitigated the degree of joint swelling and suppressed the expressions of fetal liver kinase-1, fetal liver tyrosine kinase-4 and hypoxia-inducible factor-1α in synovium. Other indicators were also reduced by TP-LHP, including hyperfunction of immune, interleukin-1β and interleukin-6 levels in serum. The therapeutic mechanism of TP-LHP might be regulation of the balance between Th1 and Th2, as well as inhibition of the expression and biological effects of vascular endothelial growth factor.
RESUMEN
Objective To discuss the application of image sensor in wireless endoscopic micro-electro-mechanical-system (MEMS). Methods Through the comparison of various types of image sensors, and in the consideration of the environment and requirement inside the body, CMOS image sensor which can output analog image signal with high density of integration, low power consumption, small profile was chosen as the sensor component of a wireless endoscope. The profile and power consumption of some specific models of this type of image sensor were compared and analyzed.Results The problems, such as ground connection, crystal configuration and the layout of circuit board, were reasonably solved during the design of image sensor's schematic circuit diagram. The image capture module based on OV7930 sensor was designed and manufactured. Images were successfully captured during the animal experiments.Conclusion The application and design of image sensor in a wireless endoscopic MEMS are feasible.
RESUMEN
This paper introduces the development of the MEMS at home and abroad,besides the key technology,the application in medicine and military about the MEMS also expounded in detail.