Expression of progenitor cell markers in livers with fulminant massive necrosis.

Studies of stem cells in various organs have greatly progressed, and progenitor cells have been confirmed even in liver by recognition of cytokeratin 14 (CK14), c-kit, flt-3, and CD34. We, therefore, immunohistochemically examined the expression of these progenitor cell markers in patients with confluent or massive necrosis, in addition to CK19, albumin, vimentin, and Ki-67. Our subjects were six survivors and 14 deceased patients. Expression of CK14 and c-kit was found in a small number of cells lining biliary ductule-like structures, and that of flt-3 was found in many lining cells in two deceased patients with multi-lobular necrosis. CK14 positive cells were positive for c-kit, flt-3, and CK19 in semi-serial sections, but were negative for albumin, Ki-67, and CD34. In conclusion, expression of CK14 and c-kit was found in a small number of cells lining biliary ductule-like structures, and that of flt-3 was found in many cells lining biliary ductule-like structures. CK14-positive cells were positive for c-kit, but negative for CD34. Since c-kit is a hematopoietic marker, our study suggests that CK14- and c-kit-positive cells may be derived from bone marrow in liver with fulminant hepatitis.