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Cytoplasmic enzyme activities in human hypernephroma compared with normal renal cortical tissue
J M González Buitrago1, I Pastor, J J Corrales
1Servicio de Análisis Clínicos, Hospital Virgen de la Vega, Salamanca, Spain.
Urologia Internationalis
|January 1, 1988
Summary
Hypernephroma, a type of kidney cancer, shows significantly lower enzymatic activities in lactate dehydrogenase (LDH) and other key enzymes compared to normal kidney tissue, suggesting a reduced metabolic rate. This metabolic shift may contribute to the slow growth observed in kidney tumors.
Area of Science:
- Biochemistry
- Oncology
- Renal Cell Carcinoma Research
Background:
- Enzymatic activity in normal renal cortical tissue and hypernephroma is crucial for understanding tumor metabolism.
- Lactate dehydrogenase (LDH), alpha-hydroxybutyrate dehydrogenase (HBDH), aspartate aminotransferase (AST), and alanine aminotransferase (ALT) are key metabolic enzymes.
Purpose of the Study:
- To compare the enzymatic activities of LDH, HBDH, AST, and ALT in normal renal cortical tissue versus hypernephroma.
- To investigate the metabolic implications of observed enzymatic differences in kidney tumors.
Main Methods:
- Enzymatic activities of LDH, HBDH, AST, and ALT were quantified in both normal renal cortical tissue and hypernephroma samples.
- Statistical analysis was performed to compare enzyme levels and ratios between normal and tumoral tissues.
Main Results:
- Significantly lower activities of LDH, HBDH, AST, and ALT were consistently found in hypernephroma tissue compared to normal renal tissue.
- The mean LDH levels were 4,333 U/l (normal) vs. 997 U/l (tumor), HBDH 2,554 vs. 387 U/l, AST 529 vs. 65 U/l, and ALT 205 vs. 9.9 U/l.
- The LDH/HBDH ratio was significantly higher in tumoral tissue (2.69) than in normal tissue (1.70).
Conclusions:
- Hypernephroma exhibits a markedly reduced metabolic rate compared to normal renal tissue.
- The observed enzymatic profile suggests decreased energy metabolism, primarily anaerobic, and reduced synthesis of nonessential amino acids in kidney tumors.
- These metabolic alterations may partially explain the characteristically slow growth rate of hypernephroma.