Now showing items 1-10 of 10

    • ATP-diphosphohydrolase activity in rat renal microvillar membranes and vascular tissue 

      Sandoval, S.; García Nannig, Lorena; Mancilla, Marta; Kettlun, Ana María; Collados, L. E.; Chayet, L.; Alvarez, A.; Traverso Cori, A.; Valenzuela Pedevila, María Antonieta (PERGAMON-ELSEVIER SCIENCE LTD, 1996-05)
      Ecto-nucleotidases may have a role in the regulation of purinoceptor-mediated responses. ATP-diphosphohydrolase or apyrase has been described as an ecto-nucleotidase, which is characterized by a low specificity for its ...
    • ATP-diphosphophydrolase activin in rat heart tissue 

      Espinosa, Victoria; Galleguillos, M.; Mancilla, Marta; Garrido, J.; Kettlun, Ana María; Collados, L. E.; Chayet, L.; García Nannig, Lorena; Traverso Cori, A.; Valenzuela Pedevila, María Antonieta (ACADEMIC PRESS AUST, 1996-08)
      Extracellular nucleotides interact with specific receptors on the cell surface and are locally metabolized by ecto-nucleotidases. Biochemical characterization of the ATPase and ADPase activities detected in rat heart ...
    • ATPASE-ADPASE ACTIVITIES OF RAT PLACENTAL TISSUE 

      Pieber, M.; Valenzuela Pedevila, María Antonieta; Kettlun, Ana María; Mancilla, Marta; Aranda, E.; Collados, L. E.; Traverso Cori, A. (PERGAMON-ELSEVIER SCIENCE LTD, 1991)
      1. Calcium-stimulated ATPase-ADPase activities were studied in a microsomal fraction of rat placental tissue. 2. The kinetic characteristics correspond to those of ATP-diphosphohydrolase, also known as apyrase (E.C. ...
    • Changes in apyrase activity in uterus and mammary gland during the lactogenic cycle 

      Valenzuela, M. A.; Collados, L.; Kettlun, A. M.; Mancilla, M.; Puente, J.; Aranda, E.; Chayet, L.; Alvarez, A.; Traverso Cori, A. (1992)
      1. 1. The purpose of this present research was to explore the possible roles of ATP-diphosphohydrolase (apyrase) in two tissues with high energetic demands during cell proliferation and differentiation. 2. 2. Changes in ...
    • Characterization of ATP-diphosphohydrolase from rat mammary gland 

      Alvarez, A.; Chayet, L.; Galleguillos, M.; García Nannig, Lorena; Kettlun, Ana María; Collados, L. E.; Traverso Cori, A.; Mancilla, M.; Valenzuela Pedevila, María Antonieta (PERGAMON-ELSEVIER SCIENCE LTD, 1996-01)
      ATP-diphosphohydrolase (or apyrase) hydrolyses nucleoside di- and triphosphates in the presence of millimolar concentration of divalent cations. It is insensitive towards sulfhydryl and aliphatic hydroxyl-selective reagents ...
    • Comparison of the biochemical properties, regulation and function of ATP-diphosphohydrolase from human placenta and rat kidney 

      Valenzuela Pedevila, María Antonieta; Kettlun, Ana María; Sandoval, S.; García Nannig, Lorena; Mancilla, Marta; Neckelmann, G.; Chayet, L.; Alvarez, A.; Cuevas, F.; Collados, L. E.; Espinosa, Victoria; Traverso Cori, A.; Bravo, I.; Acevedo, C. G.; Aranda, E. (ASSOC BRAS DIVULG CIENTIFICA, 1996-05)
      ATP-diphosphohydrolase (apyrase, EC 3.6.1.5) has both ATPase and ADPase activity that are stimulated by bivalent metals, with Ca2+ being the most effective. The possible physiological function of this enzyme, associated ...
    • Extracellular matrix protein expression in cerebrospinal fluid from patients with tropical spastic paraparesis associated with HTLV-I and Creutzfeldt-Jakob disease 

      Cartier Rovirosa, Luis; García Nannig, Lorena; Kettlun, Ana María; Castañeda, P.; Collados, L. E.; Vásquez, F.; Giraudon, P.; Belin, M. F.; Valenzuela Pedevila, María Antonieta (TAYLOR & FRANCIS AS, 2004-04)
      The cerebrospinal fluid (CSF) is in direct contact with the extracellular space of the CNS, thus biochemical processes in the CNS could potentially be reflected in the CSF. Changes in extracellular matrix (ECM) proteins ...
    • Gelatinase activitiy of matrix metalloproteinases in the cerebrospinal fluid of various patient populations 

      Valenzuela Pedevila, María Antonieta; Cartier Rovirosa, Luis; Collados, L. E.; Kettlun, Ana María; Araya, F.; Concha, C.; Flores, L.; Wolf, M. E.; Mosnaim, A. D. (P J D PUBLICATIONS LTD, 1999)
      We have studied the enzymatic gelatinolytic activity of matrix metalloproteinases (MMPs) present in cerebrospinal fluid (CSF) of samples obtained from 67 individuals, twenty-one nonneurological patients (considered controls) ...
    • HUMAN PLACENTAL ATP-DIPHOSPHOHYDROLASE - BIOCHEMICAL .CHARACTERIZATION, REGULATION AND FUNCTION 

      Kettlun, Ana María; Alvarez, A.; Quintar, R.; Valenzuela Pedevila, María Antonieta; Collados, L. E.; Aranda, E.; Banda, A.; Chayet, L.; Chiong Lay, Mario; Mancilla, Marta; Traverso Cori, A. (PERGAMON-ELSEVIER SCIENCE LTD, 1994-03)
      1. Kinetic and physico-chemical studies on human placental microsomal fraction confirmed that the ATPase and ADPase activities detected in this fraction correspond to the enzyme ATP-diphosphohydrolase or apyrase (EC 3.6.1.5). ...
    • TIMPs and MMPs expression in CSF from patients with TSP/HAM 

      Kettlun, Ana María; Cartier Rovirosa, Luis; García Nannig, Lorena; Collados, L. E.; Vásquez, F.; Ramírez, E.; Valenzuela Pedevila, María Antonieta (PERGAMON-ELSEVIER SCIENCE LTD, 2003-05-09)
      The tropical spastic paraparesis or human T-cell lymphotropic virus associated myelopathy (TSP/HAM), has been related with an overexpression of matrix metalloproteinases (MMPs), especially MMP-9. Initial studies of reverse ...