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Differential impact of fibroblasts on the efficient cell death of lung cancer cells induced by paclitaxel and cisplatin.

Abstract：

:The efficient treatment of lung carcinomas with chemotherapeutics still poses a challenge for anti-cancer therapy. Since stromal cells of the tumor may alter the responsiveness of tumor cells to chemotherapeutics, we studied the impact of lung fibroblasts (WI-38) on the chemotherapy-induced death of non-small cell lung carcinoma cells (H358). Conditioned medium from WI-38 fibroblasts impaired the H358 cell death induced by paclitaxel but not by cisplatin. Comparable results were observed when culturing H358 cells in conditioned medium from primary tumor fibroblasts or co-culturing H358 cells with fibroblasts. This anti-apoptotic effect induced by paracrine signaling from fibroblasts was associated with less necrosis (membrane leakage, mitochondrial dysfunction) and apoptosis (outer membrane phosphatidylserine exposure, pycnotic nuclei, nuclear translocation of the apoptosis-inducing factor from mitochondria, caspase-9 and -3/-7 activation) in response to paclitaxel but not cisplatin. Additionally, we demonstrated that WI-38 fibroblasts mediate activation of both extracellular signal-regulated kinases (Erk) 1/2 and Akt kinase in H358 cells. Subsequent application of specific inhibitors revealed that the paclitaxel-induced cell death is highly impaired by active Erk1/2 and Akt, whereas the cisplatin-induced cell death is independent of both kinases. Pro-apoptotic Bcl-2 family proteins such as Bim cannot explain the differential impact of fibroblasts on the H358 cell death induced by paclitaxel compared with cisplatin. Our data support the preferential use of the cisplatin-based lung carcinoma therapy, because the cell death-inducing efficiency of cisplatin is not impaired by stromal fibroblasts.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Bartling B,Hofmann HS,Silber RE,Simm A

doi

10.4161/cbt.7.8.6264

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

1250-61

issue

8

eissn

1538-4047

issn

1555-8576

pii

6264

journal_volume

7

pub_type

杂志文章

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