ABSTRACT
Based on the theory of ascending and descending of center qi， it is believed that yang deficiency and water dampness， as well as abnormal circulation of center qi， are the core pathogenesis of psoriasis. The common pathogenic evolution of psoriasis includes wood constraint and blood stagnation， lung metal fluid exhaustion. In the later stage of psoriasis， a mixture of deficiency and excess patterns， as well as cold and heat in complexity， are often observed. Treatment focuses on warming yang and resolving dampness to restore proper qi ascending and descending， and the therapeutic formulas such as Ganjiang Lingzhu Decoction （甘姜苓术汤）， Zexie Decoction （泽泻汤）， Zhenwu Decoction （真武汤）， and Linggui Zhugan Decoction （苓桂术甘汤） are suggested based on the nature and location of the disease. To unblock the qi movement through discharging the liver and rectifying the lung， Xiaochaihu Decoction （小柴胡汤） and Danzhi Xiaoyao Powder （丹栀逍遥散） are commonly used as the foundation with modifications. To balance yin and yang through clearing the heart and nourishing the kidneys， a self-designed Changzhong Decoction （畅中汤） is utilized. Following the theory of ascending and descending of center qi， it is suggested to combine cold and warm medicinals and mediate the center earth， so as to promote the circulation of the center qi， restore the clear and the turbid， and keep four-dimensional smooth flow of qi， providing a reference for traditional Chinese medicine treatment for psoriasis.
ABSTRACT
BACKGROUND:Some scholars have prepared zein/chitosan composite membrane based on blending methods, and preliminary evaluation ofitsphysical and chemical properties showsthat chitosan partly improvesthe mechanical properties and hydrophilic properties of zein. Therefore, zein/chitosan composite membrane presumably has good cytocompati bility, which is beneficial to osteogenic differentiation of bone marrow mesenchymal stem cels. OBJECTIVE:To explore the effect of zein/chitosan composite membrane on the differentiation of bone marrow mesenchymal stem cels into osteoblasts and its feasibility asabone tissue-engineered material. METHODS:With 60% acetic acid as solvent, zein/chitosan composite membrane was prepared by blending and casting method. The structure and physicochemical properties of the composite membrane were investigated by Fourier transform infrared spectroscopy, tensile testing, water absorption testing and scanning electron microscopy. And the cytocompatibility of the membrane was evaluated byin vitrocel cufture. Besides,bone marrow mesenchymal stem celsfrom Sprague-Dawley ratwere isolatedvia adherence screening method, andthe effects of thecompositemembrane on theosteogenic differentiation ofthese celswere observedby scanning electron microscopy, fluorescent labeling and alkaline phosphatase assay. RESULTS AND CONCLUSION:The tensile strength, water absorption and hydrophilicity of the films were improved with the chitosan increased; chitosan could promote cel proliferation indicating the good cytocompatibility of the composite films. Moreover, osteogenic induction occurredin bone marrow mesenchymal stem cels cultured on the compositem embrane, and with an increase of chitosan, the induction was promoted. In conclusion, zein/chitosan composite membrane can be applied widely in the field of bone tissue engineering.