Differences in polyamine metabolism between carcinomatous and uninvolved human breast tissues.
The polyamine biosynthetic enzymes ODC and SAMDC show higher activity in carcinomatous human breast tissue than in uninvolved tissue of the same breast; the interconversion enzyme PAO shows significantly lower activity in carcinomatous than uninvolved tissue. The polyamine metabolism in carcinomatous human breast tissue thus appears to differ from that in uninvolved tissue. Intracellular polyamine concentrations, particularly spermine, are high in carcinomatous tissue. This increase and that of the biosynthetic enzymes suggest that a higher polyamine concentration is needed for carcinomatous cell growth. If this is the case, the lower PAO activity in carcinomatous tissue may be explained as a mechanism that conserves the high intracellular polyamine concentration.
Romano
M
M
Division of Biochemistry, Cancer Institute, Naples, Italy.
Santacroce
M A
MA
Bonelli
P
P
Cecco
L
L
Cerra
M
M
D012437:Adenosylmethionine Decarboxylase / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000378:metabolism; D001940:Breast / Q000201:enzymology / Q000378:metabolism*; D001943:Breast Neoplasms / Q000201:enzymology / Q000378:metabolism*; D005260:Female; D006801:Humans; D009955:Ornithine Decarboxylase / Q000378:metabolism; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000378:metabolism; D011073:Polyamines / Q000378:metabolism*; D011700:Putrescine / Q000378:metabolism; D013095:Spermidine / Q000378:metabolism; D013096:Spermine / Q000378:metabolism; D000097667:Polyamine Oxidase
D012437:Adenosylmethionine Decarboxylase; D014408:Biomarkers, Tumor; D009955:Ornithine Decarboxylase; D000587:Oxidoreductases Acting on CH-NH Group Donors; D011073:Polyamines; D011700:Putrescine; D013095:Spermidine; D013096:Spermine; D000097667:Polyamine Oxidase