Kamesh Surendran, PhD, Lab
Primary Research Focus
Currently there are about 100,000 people waitlisted for a kidney transplant in the United States, with an average of 12 people on the waitlist dying each day. We are addressing this serious health problem by studying how kidneys normally develop with the long-term goal of differentiating patient-derived stem cells into functional kidneys to improve survival rates of end-stage renal disease patients. We are also interested in understanding the cellular and molecular basis of pediatric genetic disorders of the kidney. Specifically, we study the molecular regulators of tubule morphogenesis and cell fate specification in mouse models of congenital cystic kidney disease and collecting duct disorders, with the intent of finding better therapies for these diseases.
Behind the Research
We use state of the art mouse genetic tools for ectopic expression, loss of function, and cell lineage tracing studies in specific populations of cells of the developing mouse kidneys to understand the molecular regulators that ensure normal kidney development and maintenance. These studies have provided insights into the potential genetic and cellular causes of cystic kidney diseases, including those that occur in Alagille Syndrome patients, and collecting duct disorders such as Nephrogenic Diabetes Insipidus.
Cystic kidneys diseases have been associated with mutations in over fifty genes. Alagille Syndrome is a multi-organ pediatric disorder in which small multi-cystic kidneys occur with variable penetrance in humans with mutations in genes coding for Notch signaling pathway components. We are using mouse models and cell culture systems to understand how Notch signaling suppresses renal tubular cyst formation and micro-adenoma formation. These studies are likely to reveal how Notch Signaling is linked to primary cilia and the cell cycle, and will provide insights into the mechanisms by Notch functions as a tumor suppressor in epithelial cancers.
Collecting duct disorders can be caused by the inheritance of mutant genes or may be triggered by medications in adults, such as lithium used to treat depression. Even though the collecting ducts are an essential component of kidneys that regulate water, electrolyte and pH homeostasis, the mechanisms regulating collecting duct differentiation into principal cells intermingled with intercalated cells are poorly understood. We have identified potential regulators of principal cell (PC) and intercalated cell (IC) differentiation by gene expression profiling of developing mouse kidneys “genetically enriched” for PC or IC lineage cells. These studies will generate knowledge of the molecular regulators of collecting duct differentiation and maintenance which will guide the design of cell replacement or molecular therapies to treat collecting duct disorders and boost adult collecting duct regenerative capacity.