BIOMAT Database Logo BIOMAT Database Logo

Cyclic adenosine 3':5'-monophosphate phosphodiesterase activity in malignant and cyclic adenosine 3':5'-monophosphate-induced "differentiated" neuroblastoma cells. 1975

S Kumar, and G Becker, and K N Prasad

The regulation of cyclic adenosine 3:5-monophosphate (cyclic AMP) phosphodiesterase activity in homogenates of malignant and cyclic AMP-induced "differentiated" neuroblastoma cells was studied. Neuroblastoma cells of at least three mouse and one human clone had both the low (2 to 4 muM) and the high (66 to 106 muM) Km phosphodiesterase. In cyclic AMP-induced differentiated cells the values of Km were decreased, whereas the values of Vmax appeared to be slightly increased. Magnesium and manganese stimulated phosphodiesterase activity. Calcium, zinc, copper, mercury, ethylenediaminetetraacetic acid, and imidazole completely inhibited phosphodiesterase activity in malignant cells, whereas the above agents, except ethylenediaminetetraacetic acid, only partially inhibited enzyme activity in differentiated cells. Ethylenediaminetetraacetic acid completely reduced phosphodiesterase activity in differentiated cells. The pH optimum for phosphodiesterase activity was about 8 in both malignant and differentiated cells. The present studies show that the values of Km and Vmax and the sensitivity of phosphodiesterase activity to divalent ions change in cyclic AMP-induced differentiated neuroblastoma cells, and therefore we propose that the reverse may be true during malignant transformation of nerve cells.

UI MeSH Term Description Entries
D007093 Imidazoles Compounds containing 1,3-diazole, a five membered aromatic ring containing two nitrogen atoms separated by one of the carbons. Chemically reduced ones include IMIDAZOLINES and IMIDAZOLIDINES. Distinguish from 1,2-diazole (PYRAZOLES).
D008274 Magnesium A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.
D008345 Manganese A trace element with atomic symbol Mn, atomic number 25, and atomic weight 54.94. It is concentrated in cell mitochondria, mostly in the pituitary gland, liver, pancreas, kidney, and bone, influences the synthesis of mucopolysaccharides, stimulates hepatic synthesis of cholesterol and fatty acids, and is a cofactor in many enzymes, including arginase and alkaline phosphatase in the liver. (From AMA Drug Evaluations Annual 1992, p2035)
D008628 Mercury A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
D009447 Neuroblastoma A common neoplasm of early childhood arising from neural crest cells in the sympathetic nervous system, and characterized by diverse clinical behavior, ranging from spontaneous remission to rapid metastatic progression and death. This tumor is the most common intraabdominal malignancy of childhood, but it may also arise from thorax, neck, or rarely occur in the central nervous system. Histologic features include uniform round cells with hyperchromatic nuclei arranged in nests and separated by fibrovascular septa. Neuroblastomas may be associated with the opsoclonus-myoclonus syndrome. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2099-2101; Curr Opin Oncol 1998 Jan;10(1):43-51) Neuroblastomas
D010727 Phosphoric Diester Hydrolases A class of enzymes that catalyze the hydrolysis of one of the two ester bonds in a phosphodiester compound. EC 3.1.4. Phosphodiesterase,Phosphodiesterases,Hydrolases, Phosphoric Diester
D002118 Calcium A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes. Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D002421 Caudate Nucleus Elongated gray mass of the neostriatum located adjacent to the lateral ventricle of the brain. Caudatus,Nucleus Caudatus,Caudatus, Nucleus,Nucleus, Caudate
D002454 Cell Differentiation Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs. Differentiation, Cell,Cell Differentiations,Differentiations, Cell
D002999 Clone Cells A group of genetically identical cells all descended from a single common ancestral cell by mitosis in eukaryotes or by binary fission in prokaryotes. Clone cells also include populations of recombinant DNA molecules all carrying the same inserted sequence. (From King & Stansfield, Dictionary of Genetics, 4th ed) Clones,Cell, Clone,Cells, Clone,Clone,Clone Cell

Related Publications

S Kumar, and G Becker, and K N Prasad
Binding of cyclic nucleotides with proteins in malignant and adenosine cyclic 3':5'-monophosphate-induced "differentiated" neuroblastoma cells in culture.
July 1976, Cancer research,
S Kumar, and G Becker, and K N Prasad
Differences and similarities between guanosine 3',5'-cyclic monophosphate phosphodiesterase and adenosine 3',5'-cyclic monophosphate phosphodiesterase activities in neuroblastoma cells in culture.
July 1975, Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.),
S Kumar, and G Becker, and K N Prasad
Interrelationship between adenylate cyclase activity, adenosine 3':5' cyclic monophosphate phosphodiesterase activity, adenosine 3':5' cyclic monophosphate levels, and growth of cells in culture.
December 1973, Proceedings of the National Academy of Sciences of the United States of America,
S Kumar, and G Becker, and K N Prasad
Exercise-induced increases in myocardial adenosine 3',5'-cyclic monophosphate and phosphodiesterase activity.
January 1981, Biochimica et biophysica acta,
S Kumar, and G Becker, and K N Prasad
Adenosine-3',5'-cyclic monophosphate levels and adenosine-3',5'-cyclic monophosphate phosphodiesterase activity in metastasizing and nonmetastasizing rat mammary carcinomas.
January 1975, Journal of the National Cancer Institute,
S Kumar, and G Becker, and K N Prasad
Polyadenylic acid-containing cytoplasmic RNA increases in adenosine 3',5'-cyclic monophosphate-induced 'differentiated' neuroblastoma cells in culture.
August 1975, Experimental cell research,
S Kumar, and G Becker, and K N Prasad
Adenosine 3',5'-cyclic monophosphate and guanosine 3',5'-cyclic monophosphate phosphodiesterase activities in 1,2-dimethylhydrazine induced colon adenocarcinoma.
August 1979, Cancer letters,
S Kumar, and G Becker, and K N Prasad
3':5'-cyclic adenosine monophosphate phosphodiesterase: negative cooperativity.
July 1972, Proceedings of the National Academy of Sciences of the United States of America,
S Kumar, and G Becker, and K N Prasad
Inhibition of adenosine 3',5'-cyclic monophosphate phosphodiesterase.
December 1970, The Biochemical journal,
S Kumar, and G Becker, and K N Prasad
Effect of cyclic nucleotides on activity of cyclic 3',5'-adenosine monophosphate phosphodiesterase.
January 1973, Biochemical pharmacology,
Copied contents to your clipboard!