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Xuhang Li, Ph.D.

Assistant Professor
Assistant Professor of Medicine


  • Assistant Professor
  • Assistant Professor of Medicine

Research Interests

Inflammatory Bowel Disease (IBD) and Autoimmune Liver Diseases; Molecular Regulation and Physiological/Pathophysiological Role of Chloride Channel 5 (Clc-5) and Na/H Exchanger 3 (NHE3)


Dr. Xuhang Li is an Assistant Professor of Medicine in the Gastroenterology and Hepatology division. He studies inflammatory bowel disease and autoimmune liver diseases.

Dr. Li holds a graduate degree from the University of Maryland, College Park and completed fellowships at the National Cancer Institute, the National Institutes of Health, the Laboratory of Molecular Biology, and at the Johns Hopkins School of Medicine before joining the Johns Hopkins faculty. He is a member of the American Society for Cellular Biology and the American Gastroenterological Association and serves on the editorial boards of the International Journal of Clinical and Experimental Research, the Journal of Digestive Diseases and the World Journal of Biological Chemistry. His work has been recognized with an election to the Honor Society of Phi Kappa Phi in 1997, a Goldhaber Award at the University of Maryland in 1997, a Scientist of the Year Award from the GI Division of the Johns Hopkins School of Medicine in 2005, a NIH Research Scientist Career Development Award from 2002 through 2006, and a Visiting Research Professorship at the Shanghai Jiatong University School of Medicine beginning in 2007 through the present.


  • English
Additional Resources +
  • Education +


    • University of Maryland, College Park, MD


    • National Cancer Institute, National Institutes of Health, Laboratory of Molecular Biology, Bethesda, MD
    • Johns Hopkins University School of Medicine, Baltimore, MD
  • Research & Publications +

    Selected Publications

    1. Lin, R., Murtazina, R., B., Chakraborty, M., Sarker, R., Chen, T., Lin, Z., Hogema, B.M., deJonge, Seidler, U., Turner, J.R., Li, X ., Kovbasnjuk, O., Donowitz, M., 2010. D-Glucose Acts via SGLTI to Increase NH3 in Mouse Jejunal Brush Border by a NHERF2-Dependent Process. Gastroenterology. 2010 )ct. 23 (Epub ahead of print); PMID: 20977906. 

    2. Donowitz, M, Singh, S, P., Salahuddin, FF, Chen, Y, Chakraborty, M., Gucek, M., Cole, R.N., Ham, A., Zachos, N.C., Kovbasnjuk, O., Lapierre, L.A., Broere, N., Smalley, W.G., Reynolds, A.B., Hubbard, A.L., Goldenring, J., Seidler, U., deJonge, H., R. Murtazina, Hogema, B.M., and Li, X. 2010. Alterations in the Proteome of the NHERF1 Knockout Mouse Jejunal Brush Border Membrane Vesicles. Physiological Genomics. 2010. Epub 2010 Aug. 24. PMID: 20736413

    3. Alex, P., Ye, M., Sipes, J., Nguyen, T., Gonzales, L., Saksonov-Suhodrev, M., Zhang, T., Arora, Z., Centola, M., Guggino, S.E., Li, X. 2010 . Clc-5 Knockout Mice Are More Susceptible to Dextran Sulphate Sodium Induced Colitis. Accepted to Journal of Immunology. 187,3988-3996.

    4. Chen, J., Sullivan, S., Anderson, T., Tan, A.C., Alex, J., Brant, S.R., Cuffari, C., Bayless, T. M., Taylor, M. V., Burek, C.L., Wang, H., Li, R., Datta, L. W., Wu, Y., Winslow, R.L, Zhu, H. and  Li, X.  2009 . Identification of novel serological biomarkers for inflammatory bowel disease using a protein chip of whole E. coli proteome. Molecular and Cellular Proteomics. 8(8), 1765-76. 

    5. Zachos N.C., Li, X., Kovbasnjuk, O., Hogema, B., Sarker, R., Li, M., de Jonge, H., Donowitz, M. 2009 . NHERF3 (PDZK1) reconstitutes elevated intracellular calcium ([Ca2 ]i) inhibition of NHE3 activity by a mechanism different from NHERF2. J. Biol. Chem. Jun 17. PMID: 19535329 [Epub ahead of print].

    6. Zachos, N.C., van Rossum, D.B., Li, X., Caraveo, G., Sarker, R., Cha, B., Mohan, S., Desiderio, S., Patterson, R.L., Donowitz, M. 2009 . Phospholipase C-? binds directly to the Na /H exchanger 3 and is required for calcium regulation of exchange activity. J. Biol. Chem. 284 (29), 19437-44.

    7. Sullivan, S., Alex P., Dassopoulos, T., Zachos, N.C., Iacobuzio-Donahue, C., Donowitz, M., Brant, S.R., Cuffari, C., Harris, M.L., Datta L.W., Conklin, L., Chen, C., and Li, X. 2009 . Down-Regulation of Sodium Transporters and NHERF Proteins in IBD Patients and Mouse Colitis Models: Potential Contributors to IBD-associated Diarrhea. Inflammatory Bowel Disease. 15(2), 261-274.

    8. Alex, P, Zacho, N., Nguyen, T., Gonzales, L., Chen, T.E., Conklin, L.S., Centola, M, and Li, X.  2009 . Distinct cytokine patterns identified from multiplex profiles of experimental colitis.  Inflammatory Bowel Disease. 15(3), 341-352.

    9. Donowitz, M., Mohan, S., Chen T,E., Lin R., Cha, B., Zachos, NC., Murtazina R., and Sarker R., and Li, X. 2009. NHE3 regulatory Complexes. J. Exp. Biol. 212, 1638-46.  

    10. Alex, P., Gucek, M., Li, X.  2009 . Applications of Proteomics in Study of Inflammatory Bowel Diseases: Current Status and Future Potential with Available Technologies.   Inflammatory Bowel Disease. 15(4), 616-629.

    11. Xu, J., Yang, C.-H., Chen, X.-Y., Li, X., Dai, M., Xiao, S.-D. 2008. A subset of ulcerative colitis with positive proteinase-3 antineutrophil cytoplasmic antibody.  W. J. Gastroenterol. 14(45): 7012-5.

    12. Zachos, N.C., Hodson, C., Kovbasnjuk, O., Li, X.,  Thelin, W.R., Cha, B., Milgram, S., Donowitz, M. 2008. Elevated intracellular calcium stimulates NHE3 activity by an IKEPP (NHERF4) dependent mechanism. Cell. Physiol. Biochem. 22, 693-740. 

    13. Li, X., Conklin, L., and Alex, P. 2008. New Serological Biomarkers of Inflammatory Bowel Diseases. World Journal of Gastroenterology. 14 (33), 5115-5124.

    14. Sarker, R., Grønborg, M., Cha, B., Chen, Y., Mohan, S., Pandey, A., Litchfield, D., Donowitz, M. and Li, X. 2008. CK2 Binds to the C-Terminus of NHE3 and Stimulates NHE3 Basal Activity by Phosphorylating a Separate Site.   Mol. Biol. Cell . 19(9), 3859-3870.

    15. Li, X. and Donowitz, M. 2008. Fractionation of Subcellular Membrane Vesicles of Epithelial and Non-Epithelial cells by OptiPrepTM Density Gradient Ultracentrifugation. Methods in Molecular Biology/Molecular Medicine. 440:97-110.

    16. Donowitz, M., Singh, S., Salahuddin, F. F., Hogema, B. M., Gucek, M., Cole, R. N., Chen, Y., Zachos, N., Kovbasnjuk, O., Lapierre, L., Broere, N., Goldenring, J., deJonge, H. Li, X.  2007. Proteome of the Murine Jejunal Brush Border. Journal of Proteome Research. 6 (10), 4068-4079.

    17. Murtazina, R., Kovbasnjuk, O., Zachos, N., X. Li, Chen, Y., Hubbard, A., Hogema, B.M., Steplock D., Seidler, U., Hoque, K M., Tse, M., De Jonge, H.R., Weinman, E.J., and Donowitz, M.  2007. Tissue-specific regulation of sodium/proton exchanger isoform 3 activity in Na( )/H( ) exchanger regulatory factor 1 (NHERF1) null mice. cAMP inhibition is differentially dependent on NHERF1 and exchange protein directly activated by cAMP in ileum versus proximal tubule.   J. Biol. Chem. 282(34):25141-51.

    18. Donowitz, M and Li, X. 2007. Regulatory binding partner and complexes of NHE3.   Physiological Review . 87 (3), 825-72.

    19. Murtazina, R., Kovbasnjuk, O., Donowitz, M., and Li, X. 2006. Na /H exchanger 3 activity and trafficking are lipid raft dependent. J. Biol. Chem. 281, 17845-17855.

    20. Donowitz, M., Cha B., Zachos, N.C., Brett, C.L., Sharma, A., Tse, C.M., Li, X. 2005. NHERF Family and NHE3 Regulation. J. Physiol. (London). 567, 3-11.

    21. Li, X., Zhang, H., Cheong, A., Leu, S., Chen, Y., Elowsky, C.G. and Donowitz M. 2004. Carbachol Regulation of Rabbit Ileal Brush Border NHE3 Occurs through Changes in NHE3 Trafficking and Complex Formation and is Src Dependent. J. Physiol (London). 556, 791-804. 

    22. Li, X ., Leu, S., Birnbaum, M. J., Baibakov, B., Zhang, H., Shih, C. and Donowitz, M. 2004. Akt, PI-3 Kinase and PTEN are in lipid rafts in brush border of intestinal epithelial cells: potential involvement of Akt2 in stimulated Na absorption and differentiation.  Gastroenterology. 126, 122-35.

    23. Donowitz, M., Li, X. and Kim, J.H. 2003 . Large multiprotein complexes are involved in short-term regulation of the epithelial brush border Na /H exchanger NHE3. Physiol. News. 51, 20-21.

    24. Akhter, S., Kovbasnjuk, O., Li, X., Cavet, M., Noel, J., Arpin, M., Hubbard, A.L. and Donowitz, M. 2002 . Na /H Exchanger 3 is in large centrally localized complexes on the brush border of proximal tubule-derived OK cells. Am. J. Physiol. Cell Physiol. 238, C927-940.

    25. Li, X., Galli T., Leu, S., Louvard, D., and Donowitz, M. 2001 . Na /H -exchanger 3 is present in the lipid rafts in the rabbit ileal brush border: A role for rafts in the trafficking of NHE3. J. Physiol. 537, 537-552.

    26. Li, X., Perera, Y.P., Sze, H. 1999 . Cloning and Characterization of a genomic clones encoding a 16 kDa subunit c of vacuolar H -ATPase (Ava-p4) from Arabidopsis. Plant Physiology . 120, 1205.

    27. Sze, H., Li, X., and Palmgren, M.G., 1999 . Energization of Plant Cell Membranes by H -1Pumping ATPases: Regulation and Biosynthesis. Plant Cell. 11, 677-690.

    28. Li, X ., and Sze, H. 1999. An 100 kDa subunit associates with the Vo membrane sector but not with the active oat vacuolar H -ATPase, suggesting a role in assembly. The Plant Journal. 17(1), 19-30.

    29. Li, X., Su, R.T., Hsu, H., and Sze, H. 1998. Association of calnexin with vacuolar H -ATPase in oat. Plant Cell. 10, 119-130.


    Basic and Translational Research in Inflammatory Bowel Disease (IBD) and Autoimmune Liver Diseases Molecular Regulation and Physiological/Pathophysiological Role of Na /H Exchanger 3 (NHE3)
  • Academic Affiliations & Courses +
  • Activities & Honors +


    Visiting Research Professorship, Shanghai Jiaotong University School of Medicine, Renji Hospital, 2007-present
    NIH Research Scientist Career Development Award, 2002-2006
    Scientist of the Year Award, GI Division, Johns Hopkins School of Medicine, 2005  
    Graduate School Goldhaber Award, University of Maryland at College Park, 1997
    Elected to the Honor Society of PHI KAPPA PHI, 1997

    Professional Activities

    Editorial Boards of Peer Review Journals:
    International Journal of Clinical and Experimental Research
    Journal of Digestive Diseases
    World Journal of Biological Chemistry

    Editorial Activities (Journal peer review activities): 
    Journal of Clinical Investigation (JCI)
    Journal of Biological Chemistry (JBC)
    Molecular Cancer
    Trends in Pharmacological Sciences
    Inflammatory Bowel Disease (IBD)
    Journal of Physiology (London)
    Biochemical Journal
    Current Cancer Drug Targets (CCDT)
    Pharmacological Research
    Biochimica et Biophysica Acta (BBA)
    Clinical Gastroenterology and Hepatology (CGH)

    Grant Review (Invited grant peer review activities):
    Dept of Defense: US Army Medical Research and Material Command (USAMRMC)
    Peer Reviewed Medical Reseach Program (PRMRP)
    The US Department of Veteran's Affairs Research Service
    Medical Research Council (MRC),
    Molecular and Cellular Medicine Board United Kingdom (UK)
    Welcome Trust, United Kingdom (UK)
    Broad Medical Research Program (BMRP)
    Israel Science Foundation, Israel Scientific Advisory Group,
    Ontario Genomics Institute, Canada
  • Videos & Media +
  • Events +
  • Contact & Locations +


    • Medicine - Gastroenterology

    For Research Inquiries Contact

    Phone: 443-287-4804 (Office) 410-502-4487 (Lab-1) 410-502-4581 (Lab-2) Johns Hopkins University School of Medicine Department of Medicine 746 Ross Research Bldg, 720 Rutland Ave Baltimore, MD 21205

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