W. Allan Walker, M.D.

Honorary Investigator
Mucosal Immunology and Biology Research Center, Mass General Research Institute
Honorary Pediatrician
Pediatrics-Pediatric Gastroenterology, Massachusetts General Hospital
MD Washington University School of Medicine in St. Louis 1963
bifidobacterium; enterocolitis, necrotizing; enterocytes; gastrointestinal tract; infant nutritional physiological phenomena; intestines; milk, human; probiotics

My research efforts include defining the passive and active protective properties of human breast milk with regard to the protection from disease during the newborn period. I also study the development of human intestinal host defenses using human fetal organ cultures, cell lines, and xenograft transplant models.

Specifically, my laboratory has reported that the human fetal epithelium responds inappropriately to both endotoxin and exotoxins, which helps to explain an increased incidence and severity of certain inflammatory and secretory diarrheas in this age group.

More recently, we have studied the effect of initial colonizing microbiota on the development of mucosal protective function and the mechanism of probiotics in this process.

Until January 2013, I was responsible for overseeing the Mucosal Immunology and Developmental Gastroenterology Laboratories as part of the Gastroenterology and Nutrition Division at MGHfC at Harvard Medical School, which is now the Mucosal Immunology and Biology Research Center, headed by Dr. Alessio Fasano.

Research lab website Publications

CNY-Building #114
114 16th Street
Charlestown, MA 02129