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Induction of apoptosis in K562/ADM cells by gamma-linolenic acid involves lipid peroxidation and activation of caspase-3.

Abstract：

:Numerous studies have revealed that gamma-linolenic acid (GLA) possesses effective tumoricidal properties while not inducing damage to normal cells or creating harmful systemic side effects. It can exert anti-tumor efficacy against a variety of cancers including leukemia. However, little is known about the effects of GLA on leukemia resistant to chemotherapy, emerging as a serious clinical problem. The present study tested GLA-induced apoptosis in K562/ADM multidrug-resistant (MDR) leukemic cells and investigated its possible mechanisms. Using cell viability, fluorescent staining of nuclei, flow cytometric Annexin V/PI double staining and lactate dehydrogenase (LDH) release, we found that GLA could inhibit cell growth and induce apoptosis and secondary necrosis. The results showed that incubation with GLA concentrations of 10-60 microg/ml caused a dose- and time-dependent decrease of K562/ADM cell viability, and the IC50 value was 50.5 microg/ml at 24 h and 31.5 microg/ml at 48 h. Flow cytometry using Annexin V/PI double staining assessed apoptosis, necrosis and viability. Typical apoptotic nuclei were shown by staining of K562/ADM cells with DNA-binding fluorochrome Hoechst 33342, characterized by chromatin condensation and nuclear fragmentation. On the other hand, after treated K562/ADM cells with 20 microg/ml GLA for 48 h and with 40 microg/ml GLA for 12 h, the LDH release significantly increased, indicated losses of plasma membrane integrity and presence of necrosis. Further, the inhibition of GLA-induced apoptosis by a pan-caspase inhibitor (z-VAD-fmk) suggested the involvement of caspases. The increase of caspase-3 activity with GLA concentration confirmed its role in the process. The results also showed that the malondialdehyde (MDA) content was also significantly elevated, and antioxidant BHT could block GLA cytotoxity, indicating the cytotoxity induced by GLA may be due to lipid peroxidation.

journal_name

Chem Biol Interact

journal_title

Chemico-biological interactions

authors

Kong X,Ge H,Hou L,Shi L,Liu Z

doi

10.1016/j.cbi.2006.05.019

subject

Has Abstract

pub_date

2006-08-25 00:00:00

pages

140-8

issue

2

eissn

0009-2797

issn

1872-7786

pii

S0009-2797(06)00142-6

journal_volume

162

pub_type

杂志文章

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