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[Studies on the antitumor activity of organotin compounds]
1Department of Biochemical Pharmacology, School of Pharmacy, Beijing Medical University.
Abstract:
Organotin compounds were found to obviously inhibit the activity of phospholipid/Ca(2+)-dependent protein kinase (PKC) in rat brain tissue and the proliferation of tumor cell lines in vitro. The results showed that a correlation exists between the effects on PKC and anti-proliferative and antitumor activities. The structure-activity relationship was shown to be as follows: (1) R, the organic group determines the biological activity; (2) electronegativity of the halogen can affect the activity. The organotin compounds inhibit tumor cells by its [SnR2]2+, and inhibit G1-->S phases of HL-60 cell cycle. The IC50 of [SnPh2F2], [SnPh2(CysOS)].H2O and [SnPh2Cl2.phen(CH3)2] are respectively 25, 15 and 20 mumol.L-1 on PKC, 0.5, 4.0 and 0.3 mumol.L-1 on HL-60 cells, 2.7, 9 and 1.5 mumol.L-1 on BEL-7402 cells, 2.2, 15 and 5.0 mumol.L-1 on KB cells. But no induction of differentiation of leukemic cell lines HL-60 and K562 was observed.
Insights
Organotin compounds inhibit cancer cell proliferation by affecting protein kinase C (PKC) activity. Structure-activity relationships reveal organic groups and halogen electronegativity are key to these antitumor effects.
Area of Science:
- Biochemistry
- Pharmacology
- Toxicology
Context:
- Organotin compounds exhibit diverse biological activities.
- Protein kinase C (PKC) plays a crucial role in cellular signaling and proliferation.
- Tumorigenesis involves dysregulated cell proliferation and cell cycle progression.
Purpose:
- To investigate the inhibitory effects of organotin compounds on phospholipid/Ca(2+)-dependent protein kinase (PKC) activity.
- To evaluate the anti-proliferative and antitumor activities of organotin compounds against various tumor cell lines.
- To elucidate the structure-activity relationships (SAR) governing the biological effects of organotin compounds.
Summary:
- Organotin compounds significantly inhibit PKC activity in rat brain tissue and the proliferation of tumor cell lines in vitro.
- A correlation was established between PKC inhibition and anti-proliferative/antitumor activities.
- The study identified that the organic group (R) and halogen electronegativity influence biological activity, with organotin compounds targeting the G1-->S phase of the HL-60 cell cycle.
Impact:
- These findings suggest organotin compounds as potential candidates for anticancer drug development.
- Understanding the SAR can guide the design of more potent and selective organotin-based therapeutics.
- The research provides insights into the molecular mechanisms underlying organotin-induced cytotoxicity, specifically the inhibition of PKC and cell cycle arrest.