Abstract
Purpose: We previously established a mechanistic rationale for Src inhibition as a novel therapeutic target in pancreatic cancer and have identified activated STAT3 as a potential biomarker of resistance to Src inhibition. The purpose of this study was to translate the current understanding of complementary activated tyrosine kinase signaling pathways by targeting Src kinase and epidermal growth factor receptor (EGFR). Experimental Design: IC 50 values for dasatinib, a Src kinase inhibitor, erlotinib, an EGFR tyrosine kinase inhibitor and gemcitabine were determined and sensitive and resistant pancreatic cancer cell lines were identified. The in vitro and in vivo effects of these agents on multiple signaling pathways and tumorigenicity in pancreatic cancer were investigated. Results: The combination of dasatinib, erlotinib, and gemcitabine resulted in cooperative inhibition of cell migration and invasion of both sensitive and resistant pancreatic cancer cells as well as cooperative inhibition of multiple signaling pathways including FAK, AKT, ERK, JNK, MAPK, and STAT3 at concentrations that were ineffective as individual agents or as double combinations of agents. The triple combination of agents was also most effective at inhibiting the growth of xenografts of both sensitive and resistant pancreatic cancer cells in vivo without increasing toxicity. Furthermore, combined inhibition of Src and EGFR with gemcitabine inhibited constitutively activated STAT3 in vitro and in vivo. Conclusions: These results provide evidence that combined targeted biological therapy in addition to cytotoxic chemotherapy can overcome treatment resistance. Such treatment strategies may be used to tailor therapy based on identified biomarkers of resistance to targeted monotherapy.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 483-493 |
| Number of pages | 11 |
| Journal | Clinical Cancer Research |
| Volume | 17 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 1 2011 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Cancer Research
- Oncology
Cite this
Combined blockade of Src kinase and epidermal growth factor receptor with gemcitabine overcomes STAT3-mediated resistance of inhibition of pancreatic tumor growth. / Nagathihalli, Nagaraj; Washington, M. Kay; Merchant, Nipun.
In: Clinical Cancer Research, Vol. 17, No. 3, 01.02.2011, p. 483-493.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Combined blockade of Src kinase and epidermal growth factor receptor with gemcitabine overcomes STAT3-mediated resistance of inhibition of pancreatic tumor growth
AU - Nagathihalli, Nagaraj
AU - Washington, M. Kay
AU - Merchant, Nipun
PY - 2011/2/1
Y1 - 2011/2/1
N2 - Purpose: We previously established a mechanistic rationale for Src inhibition as a novel therapeutic target in pancreatic cancer and have identified activated STAT3 as a potential biomarker of resistance to Src inhibition. The purpose of this study was to translate the current understanding of complementary activated tyrosine kinase signaling pathways by targeting Src kinase and epidermal growth factor receptor (EGFR). Experimental Design: IC 50 values for dasatinib, a Src kinase inhibitor, erlotinib, an EGFR tyrosine kinase inhibitor and gemcitabine were determined and sensitive and resistant pancreatic cancer cell lines were identified. The in vitro and in vivo effects of these agents on multiple signaling pathways and tumorigenicity in pancreatic cancer were investigated. Results: The combination of dasatinib, erlotinib, and gemcitabine resulted in cooperative inhibition of cell migration and invasion of both sensitive and resistant pancreatic cancer cells as well as cooperative inhibition of multiple signaling pathways including FAK, AKT, ERK, JNK, MAPK, and STAT3 at concentrations that were ineffective as individual agents or as double combinations of agents. The triple combination of agents was also most effective at inhibiting the growth of xenografts of both sensitive and resistant pancreatic cancer cells in vivo without increasing toxicity. Furthermore, combined inhibition of Src and EGFR with gemcitabine inhibited constitutively activated STAT3 in vitro and in vivo. Conclusions: These results provide evidence that combined targeted biological therapy in addition to cytotoxic chemotherapy can overcome treatment resistance. Such treatment strategies may be used to tailor therapy based on identified biomarkers of resistance to targeted monotherapy.
AB - Purpose: We previously established a mechanistic rationale for Src inhibition as a novel therapeutic target in pancreatic cancer and have identified activated STAT3 as a potential biomarker of resistance to Src inhibition. The purpose of this study was to translate the current understanding of complementary activated tyrosine kinase signaling pathways by targeting Src kinase and epidermal growth factor receptor (EGFR). Experimental Design: IC 50 values for dasatinib, a Src kinase inhibitor, erlotinib, an EGFR tyrosine kinase inhibitor and gemcitabine were determined and sensitive and resistant pancreatic cancer cell lines were identified. The in vitro and in vivo effects of these agents on multiple signaling pathways and tumorigenicity in pancreatic cancer were investigated. Results: The combination of dasatinib, erlotinib, and gemcitabine resulted in cooperative inhibition of cell migration and invasion of both sensitive and resistant pancreatic cancer cells as well as cooperative inhibition of multiple signaling pathways including FAK, AKT, ERK, JNK, MAPK, and STAT3 at concentrations that were ineffective as individual agents or as double combinations of agents. The triple combination of agents was also most effective at inhibiting the growth of xenografts of both sensitive and resistant pancreatic cancer cells in vivo without increasing toxicity. Furthermore, combined inhibition of Src and EGFR with gemcitabine inhibited constitutively activated STAT3 in vitro and in vivo. Conclusions: These results provide evidence that combined targeted biological therapy in addition to cytotoxic chemotherapy can overcome treatment resistance. Such treatment strategies may be used to tailor therapy based on identified biomarkers of resistance to targeted monotherapy.
UR - http://www.scopus.com/inward/record.url?scp=79551692141&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79551692141&partnerID=8YFLogxK
U2 - 10.1158/1078-0432.CCR-10-1670
DO - 10.1158/1078-0432.CCR-10-1670
M3 - Article
VL - 17
SP - 483
EP - 493
JO - Clinical Cancer Research
JF - Clinical Cancer Research
SN - 1078-0432
IS - 3
ER -