Cytotoxic properties of tyloxapol
Jung-hua Steven Kuo1, Ming-shiou Jan, Hsuan Wen Chiu
1Graduate Institute of Pharmaceutical Science, Chia Nan University of Pharmacy and Science, 60 Erh-Jen Road, Sec. 1, Jen-Te, Tainan, 717, Taiwan. kuojunghua@yahoo.com.tw
Pharmaceutical Research
|June 17, 2006
Summary
Tyloxapol, a nonionic surfactant, induces apoptosis, a programmed cell death, in both macrophage and fibroblast cells. This mechanism is independent of caspases and can be mitigated by lipids.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Tyloxapol is a nonionic surfactant used in biomedical applications.
- Previous reports indicate tyloxapol's cytotoxicity, but its cell death mechanisms remain unelucidated.
Purpose of the Study:
- To investigate whether tyloxapol induces apoptosis or necrosis.
- To understand tyloxapol's molecular mechanisms of cell death.
Main Methods:
- RAW 264.7 and NIH/3T3 cells were treated with tyloxapol.
- Cell viability was assessed by dehydrogenase activity.
- Apoptosis was characterized by nuclear staining, DNA fragmentation assays, and flow cytometry.
Main Results:
- Tyloxapol induced dose- and time-dependent cytotoxicity, primarily in RAW 264.7 cells.
- Morphological and molecular hallmarks of apoptosis were observed, including chromatin condensation and DNA fragmentation.
- Tyloxapol-induced apoptosis was caspase-independent and could be reduced by co-administration of a specific lipid.
Conclusions:
- Tyloxapol triggers apoptosis in murine macrophage and fibroblast cell lines.
- This study elucidates the molecular mechanism of tyloxapol-induced cell death.
