Xiaozhu Huang, M.D.
Associate Professor of Medicine
University of California, San Francisco
Mission Bay Rock Hall
1550 - 4th Street, 5th floor, Room 548C, Box 2922
San Francisco, CA 94143-2922
Tel: (415) 514-4272
Fax: (415) 514-4278
Mouse Physiology and Morphology
Xiaozhu Huang received her medical degree from the Tongji Medical University in Wuhan, China. She came to UCSF in 1992 as a post-doctoral fellow and joined the faculty of the school of medicine in 1999. She is the director of the animal airway physiology and microscopy core facility, UCSF Sandler Asthma Basic Research Center. Her major academic interests are in the areas of biological functions of integrins and genetic contributions of asthma.
Her major research interest concerns biological functions of integrins and molecular mechanisms of common lung diseases, asthma, and pulmonary fibrosis. Studies in vivo functions of integrin avb6, avb5 and a9b1 using mice that express null mutations of the molecules. b6 subunit knockout mice develop exaggerated inflammatory responses to injury in the lungs and skin, but are protected from bleomycin-induced pulmonary fibrosis. Further study demonstrates the involvement of b6 in the development of pulmonary emphysema. More importantly, the phenotypes developed in b6 knockout mice are mediated through binding and activating TGF-b pathway, suggesting that our findings provide the possibility of blocking TGF-b activation and thus of treating these diseases. The studies on integrin subunit b5 using knockout mice revealed important roles of this integrin in VEGF-mediated vascular permeability and neovascularization. The studies on a9 knockout mice provide evidence that this integrin is important in lymphangiogenesis and angiogenesis.
Recently, she has been focusing on identifying new genes and gene pathways that are involved in the pathogenesis of asthma. Previous studies have shown that the development of asthma is largely attributed to the interaction of genetic and environmental factors. To better understand the genetic factors that underlie the phenotypic features of asthma, we have combined the strategy of genetic linkage analysis and global analysis of gene expression in 11 different inbred strains of mice in model of allergic asthma (ovalbumin sensitization and challenge). Several candidate genes have been shown to be associated with asthma-related features. Of those, FcgammaRIIb is particular interesting to us because this gene may be involved in regulating the function of B lymphocyte and thus affects the serum IgE level at least in mice. Further study of using transgenic and/or knockout mice would help us to understand the specific role(s) of each molecule in the model we have analyzed.