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Studies on an antineoplastic fraction from human urine. Characterization of the major protein in this fraction
Abstract:
A fraction has been isolated from human urine which exhibits antiproliferative activity against human tumour cell lines without affecting the growth of several normal diploid cell lines or tumour cells of mouse or hamster origin. The major protein present in this fraction has been characterized and tentatively designated antineoplastic urinary protein (ANUP). An S020,W value of 3.69 S was obtained by sedimentation velocity analysis, and a subunit molecular mass of 16 300 Da was obtained by sedimentation equilibrium and by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis. Centrifugation data also indicated that the protein self-associates. The amino acid analysis of ANUP was consistent with its low pI (4.2) as determined by chromatofocusing analysis. Furthermore, the amino acid composition exhibited some features similar to collagen, as shown by high levels of proline and glycine, the absence of cysteine, and the presence of low levels of hydroxyproline.
Insights
Researchers isolated a novel protein from human urine with antiproliferative effects on human tumor cells. This antineoplastic urinary protein (ANUP) shows potential for cancer research and therapy development.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Human urine contains bioactive compounds.
- Tumor cell proliferation is a hallmark of cancer.
Purpose of the Study:
- To isolate and characterize a protein from human urine with antiproliferative activity.
- To investigate the biochemical properties of this novel protein.
Main Methods:
- Fractionation of human urine.
- Antiproliferative assays against human tumor cell lines.
- Sedimentation velocity and equilibrium analysis.
- SDS-PAGE for molecular mass determination.
- Chromatofocusing for pI determination.
- Amino acid analysis.
Main Results:
- A protein fraction with selective antiproliferative activity against human tumor cells was isolated.
- The major protein, designated antineoplastic urinary protein (ANUP), has a sedimentation coefficient of 3.69 S.
- ANUP has a subunit molecular mass of 16,300 Da and self-associates.
- ANUP has a low pI of 4.2 and an amino acid composition similar to collagen (high proline/glycine, no cysteine, low hydroxyproline).
Conclusions:
- A novel antiproliferative protein, ANUP, has been identified in human urine.
- ANUP exhibits selective toxicity towards human tumor cells.
- ANUP's biochemical characteristics suggest a unique structure with potential therapeutic applications.