Please note: The University of Texas Health Science Center at San Antonio will now be called "UT Health San Antonio."

Search Program Faculty/Research

Ralph A. DeFronzo, M.D.



Dr. Ralph DeFronzo's major interests focus on the pathogenesis and treatment of type 2 diabetes mellitus and the central role of insulin resistance in the metabolic-cardiovascular cluster of disorders known collectively as the Insulin Resistance Syndrome. Using the euglycemic insulin clamp technique in combination with radioisotope turnover methodology, limb catheterization, indirect calorimetry, and muscle biopsy, he has helped to define the biochemical and molecular disturbances responsible for insulin resistance in type 2 diabetes mellitus.

Selected Publications

Merovci A, Solis-Herrera C, Daniele G, Eldor R, Fiorentino TV, Tripathy D, Xiong J, Perez Z, Norton L, Abdul-Ghani MA, DeFronzo RA. Dapagliflozin improves muscle insulin sensitivity but enhances endogenous glucose production. J Clin Invest. 2014 Feb 3;124(2):509-14.

Doiron B, Hu W, Norton L, DeFronzo RA. Lentivirus shRNA Grb10 targeting the pancreas induces apoptosis and improved glucose tolerance due to decreased plasma glucagon levels. Diabetologia. 2012 Mar;55(3):719-28.

DeFronzo RA. Insulin resistance, lipotoxicity, type 2 diabetes and atherosclerosis: the missing links. The Claude Bernard Lecture 2009. Diabetologia. 2010 Jul;53(7):1270-87.

Defronzo RA. Banting Lecture. From the triumvirate to the ominous octet: a new paradigm for the treatment of type 2 diabetes mellitus. Diabetes. 2009 Apr;58(4):773-95.

Professor & Division Chief


M.D., Medicine, Harvard Medical School, 1969

M.S., Medicine, Boston College Graduate School of Biology, 1969

BMS, Medicine, Dartmouth Medical School

B.S., Biology/Biochemistry, Yale University, 1964



Phone: (210) 567-6691

Research Profile
More Info...

Graduate Students

Juan Xiong
IMGP/Physiology (Ph.D.)

Lu Zhang
IMGP/Physiology (Ph.D.)

Stephen (Xi) Chen
IMGP/Physiology (Ph.D.)

Feng Dong (M.S.)
Clinical Investigation

Marjorie Molina-Carrion (M.S.)
Clinical Investigation