Senescent erythrocytes from rabbits were previously shown to have elevated levels of adenine nucleotides. The present study documents that aged red blood cells have a normal synthetic capacity for adenine nucleotides. as mdicated by normal levels of adenosine kinase. However. senescent erythrocytes do have decreased levels of adenosine 5’-monophosphate deaminase, the critical enzyme involved in...

BACKGROUND Cyclic adenosine monophosphate response element binding protein (CREB) is a transcription factor that, on phosphorylation by protein kinases, is activated, and in response, regulates the transcription of many neuronally expressed genes. In view of the recent observations that catalytic properties and/or expression of many kinases that mediate their physiological responses through the...

Ribavirin (RBV) has been widely used as an antiviral reagent, specifically for patients with chronic hepatitis C. We previously demonstrated that adenosine kinase, which monophosphorylates RBV into the metabolically active form, is a key determinant for RBV sensitivity against hepatitis C virus RNA replication. However, the precise mechanism of RBV action and whether RBV affects cellular metabo...

Tracheal submucosal glands are of great relative importance in the secretion of chloride and water to the airway lumen. This study aimed to examine whether the cystic fibrosis transmembrane conductance regulator (CFTR) is involved in cyclic adenosine monophosphate (cAMP) or Ca2+-activated Cl- secretion. Regulation of Cl- secretion in cell cultures derived from pig tracheal submucosal gland acin...

Aggregation induced by adenosine diphosphate is inhibited by adenosine as well as by adenosine mono- and triphosphate. Thrombin-induced aggregation is also inhibited by adenosine and the monophosphate, but the triphosphate at a similar concentration is not inhibitory. Aggregation induced by tri-ethyl tin is accelerated by a critical concentration of triphosphate and delayed by a higher concentr...