[Analysis of the salvage synthesis within biosynthesis of nucleic acid route in colon cancer].
Orotate phosphoribosyl transferase (OPRT), thymidine phosphorylase (TP), uridine phosphorylase (UP), dihydropyrimidine dehydrogenase (DPD), and thymidylate synthetase (TS) are enzymes which analyze the salvage synthesis within the biosynthesis of the nucleic acid route of colon cancer. These enzymes were measured in carcinoma and normal tissue. OPRT was 0.065 +/- 0.041 nmol/min/mg protein, TP 4.04 +/- 2.81 nmol/min/mg protein, UP 1.79 +/- 1.19 nmol/min/mg protein, DPD 23.8 +/- 12.0 pmol/min/mg protein, and TS 6.1 +/- 4.4 pmol/g tissue in the normal tissue, and OPRT was 0.199 +/- 0.146 nmol/min/mg protein, TP 13.63 +/- 6.04 nmol/min/mg protein, UP 5.84 +/- 2.37 nmol/min/mg protein, DPD 22.0 +/- 13.4 pmol/min/mg protein, TS 16.9 +/- 7.8 pmol/g tissue in the carcinoma. OPRT, TP, and UP in the carcinoma mainly existed about 3.06-3.37 times that in normal tissue and TS at about 2.77 times. No significant difference was seen in DPD. A correlation was found between OPRT in normal tissue and carcinoma. Biosynthesis of nucleic acid via salvage synthesis is actively stimulated. Enzymatic activity related to uracil was high, and was thought to be closely connected to the growth of the cancer.
Katsumata
K
K
Dept. of Gastroenterological Surgery, Hachioji Medical Center, Tokyo Medical University.
Sumi
T
T
Murohashi
T
T
Nagashima
K
K
Uda
O
O
Ashizawa
T
T
Yamamoto
K
K
Koyanagi
Y
Y
D000368:Aged; D003110:Colonic Neoplasms / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D042943:Dihydrouracil Dehydrogenase (NADP); D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009696:Nucleic Acids / Q000096:biosynthesis*; D009962:Orotate Phosphoribosyltransferase / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism*; D013939:Thymidine Phosphorylase / Q000378:metabolism*; D014543:Uridine Phosphorylase / Q000378:metabolism*
D009696:Nucleic Acids; D010088:Oxidoreductases; D042943:Dihydrouracil Dehydrogenase (NADP); D009962:Orotate Phosphoribosyltransferase; D014543:Uridine Phosphorylase; D013939:Thymidine Phosphorylase