SAMHD1 acetylation enhances its deoxynucleotide triphosphohydrolase activity and promotes cancer cell proliferation.

SAM domain and HD domain containing protein 1 (SAMHD1) is a deoxynucleotide triphosphohydrolase (dNTPase) that inhibits retroviruses by depleting intracellular deoxynucleotide triphosphates (dNTPs) in non-cycling myeloid cells. Although SAMHD1 is expressed ubiquitously throughout the human body, the molecular mechanisms regulating its enzymatic activity and function in non-immune cells are relatively unexplored. Here, we demonstrate that the dNTPase activity of SAMHD1 is regulated by acetylation, which promotes cell cycle progression in cancer cells.

Intrahepatic cholangiocarcinoma with predominant "ductal plate malformation" pattern: a new subtype.

Ten cases of intrahepatic cholangiocarcinoma showing a highly differentiated adenocarcinoma mimicking ductal plate malformation (DPM) are reported. The patients included 7 males and 3 females with an average age of 69.5 years.

Overexpression of metastasis-associated protein 2 is associated with hepatocellular carcinoma size and differentiation.

Background And Aim: Metastasis is a multistep event in which neoplastic cells detach from the tumor, migrate, disseminate, extravasate, and eventually proliferate at the secondary distant sites. Hepatocellular carcinoma (HCC) is characterized by hypervascularity and frequent metastasis. Recently, metastasis-associated proteins were identified and named metastatic tumor antigens (MTA) 1, 2, and 3.

Regression of pancreatic fibrosis after steroid therapy in patients with autoimmune chronic pancreatitis.

Autoimmune chronic pancreatitis (AICP) is a clinically attractive entity because of its dramatic response to steroid therapy. Reported cases of AICP until now have focused on mainly clinical, radiologic, and laboratory features with steroid therapy. There are, however, few reports that demonstrate histologic recovery, especially regression of pancreatic fibrosis in patients with AICP.