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Suppression of angiogenesis by the antitumor agent titanocene dichloride
M Bastaki1, E Missirlis, N Klouras
1Department of Pharmacology, School of Medicine, University of Patras, Greece.
Abstract:
Titanocene dichloride, which is an active antitumor agent against solid but not blood-borne tumors, suppresses angiogenesis and inhibits biosynthesis of collagenous proteins in the in vivo system of the chorioallantoic membrane of the chick embryo. The agent does not affect total protein biosynthesis in the same system. At non-toxic dose regimens titanocene dichloride retards the growth of Walker 256 carcinosarcoma transplants in rats and reduces the number of seeded implants in the mesenteric bed. At concentrations which suppress angiogenesis and inhibit biosynthesis of collagenous proteins, the agent does not affect the viability of Walker 256 carcinosarcoma cells, or the attachment and proliferation of human A549 lung adenocarcinoma or human umbilical vein endothelial cells in culture. It appears that the antitumor activity of titanocene dichloride may be attributed, at least in part, to its ability to suppress angiogenesis.
Insights
Titanocene dichloride is an antitumor agent that inhibits collagen production and angiogenesis, slowing tumor growth. Its anti-cancer effects are linked to its ability to suppress new blood vessel formation.
Area of Science:
- Oncology
- Biochemistry
- Pharmacology
Background:
- Titanocene dichloride shows antitumor activity against solid tumors.
- Its mechanism involves suppression of angiogenesis and collagen biosynthesis.
Purpose of the Study:
- To investigate the antitumor mechanisms of titanocene dichloride.
- To determine if titanocene dichloride affects protein biosynthesis, cell viability, or proliferation.
Main Methods:
- In vivo studies using chick embryo chorioallantoic membrane and rat Walker 256 carcinosarcoma.
- In vitro studies using cultured human A549 lung adenocarcinoma and umbilical vein endothelial cells.
Main Results:
- Titanocene dichloride suppressed angiogenesis and collagenous protein biosynthesis in vivo.
- It did not affect total protein biosynthesis, cell viability, or proliferation in vitro.
- The agent retarded Walker 256 carcinosarcoma growth and reduced tumor seeding in rats.
Conclusions:
- Titanocene dichloride's antitumor activity is partly due to its ability to suppress angiogenesis.
- The drug's effects are specific to angiogenesis and collagen synthesis, not general protein synthesis or cell viability.