βγ-CAT, a non-lens betagamma-crystallin and trefoil factor complex, induces calcium-dependent platelet apoptosis

Qian Gao; Yang Xiang; Zhongming Chen; Lin Zeng; Xutong Ma; Yun Zhang

doi:10.1160/TH10-10-0690

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2011; 105(05): 846-854
DOI: 10.1160/TH10-10-0690

Platelets and Blood Cells

Schattauer GmbH

βγ-CAT, a non-lens betagamma-crystallin and trefoil factor complex, induces calcium-dependent platelet apoptosis

Qian Gao

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

²School of Life Science, University of Science and Technology of China, Hefei, China

,

Yang Xiang

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

³Graduate School of Chinese Academy of Sciences, Beijing, China

,

Zhongming Chen

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

³Graduate School of Chinese Academy of Sciences, Beijing, China

,

Lin Zeng

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

³Graduate School of Chinese Academy of Sciences, Beijing, China

,

Xutong Ma

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

³Graduate School of Chinese Academy of Sciences, Beijing, China

,

Yun Zhang

¹Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China

› Author Affiliations

Abstract

Summary

In recent years, it has been reported that apoptosis may occur in platelets and play a role in the clearance of effete platelets. βγ-CAT, a newly identified non-lens βγ-crystallin and trefoil factor complex from frog Bombina maxima skin secretions, caused several in vivo toxic effects on mammals. Through determined haematological parameters of rabbits, it has been found that βγ-CAT significantly reduced the number of platelets in a time-dependent manner. Here, in order to explore the effect of βγ-CAT on platelets, washed platelets were incubated with various concentrations of βγ-CAT for 30 minutes. We found that βγ-CAT induced several apoptosis events in human platelets, including caspase-3 activation, phosphatidylserine (PS) exposure, depolarisation of mitochondrial inner transmembrane potential (ΔΨm), cytochrome c re-lease and strong expression of pro-apoptotic Bax and Bak proteins. However, βγ-CAT did not significantly induce platelet activation as detected by P-selectin surface expression, GPIIb/IIIa activation and platelet aggregation. In addition, we observed that βγ-CAT-induced PS exposure and ΔΨm depolarisation in platelets are Ca²⁺-dependent. Taken together, βγ-CAT can induce Ca²⁺-dependent platelet apoptosis but does not cause platelet activation.

Keywords

Platelet apoptosis - non-lens βγ-crystallins - trefoil factor - βγ-CAT - Ca²⁺

Full Text

References

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