Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model.

Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Research Abstract Details 

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Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Abstract Text:

Jinwei Hu,Xiangpeng Yuan,MinHee K Ko,Dali Yin,Manuel R Sacapano,Xiao Wang,Bindu M Konda,Andres Espinoza,Ksenia Prosolovich,John M Ong,Dwain Irvin,Keith L Black,

BACKGROUND: The blood-brain tumor barrier (BTB) impedes the delivery of therapeutic agents to brain tumors. While adequate delivery of drugs occurs in systemic tumors, the BTB limits delivery of anti-tumor agents into brain metastases. RESULTS: In this study, we examined the function and regulation of calcium-activated potassium (KCa) channels in a rat metastatic brain tumor model. We showed that intravenous infusion of NS1619, a KCa channel agonist, and bradykinin selectively enhanced BTB permeability in brain tumors, but not in normal brain. Iberiotoxin, a KCa channel antagonist, significantly attenuated NS1619-induced BTB permeability increase. We found KCa channels and bradykinin type 2 receptors (B2R) expressed in cultured human metastatic brain tumor cells (CRL-5904, non-small cell lung cancer, metastasized to brain), human brain microvessel endothelial cells (HBMEC) and human lung cancer brain metastasis tissues. Potentiometric assays demonstrated the activity of KCa channels in metastatic brain tumor cells and HBMEC. Furthermore, we detected higher expression of KCa channels in the metastatic brain tumor tissue and tumor capillary endothelia as compared to normal brain tissue. Co-culture of metastatic brain tumor cells and brain microvessel endothelial cells showed an upregulation of KCa channels, which may contribute to the overexpression of KCa channels in tumor microvessels and selectivity of BTB opening. CONCLUSION: These findings suggest that KCa channels in metastatic brain tumors may serve as an effective target for biochemical modulation of BTB permeability to enhance selective delivery of chemotherapeutic drugs to metastatic brain tumors.

Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Publishing Authors By Initials

J Hu,X Yuan,MK Ko,D Yin,MR Sacapano,X Wang,BM Konda,A Espinoza,K Prosolovich,JM Ong,D Irvin,KL Black,

For similar xenograft model antitumor assays research abstracts see: xenograft model antitumor assays research

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Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Molecular cancer

VOLUME: 6

Page Numbers: 22

Journal Abbreviation: Mol. Cancer

ISSN: 1476-4598

DAY: 14

MONTH: 03

YEAR: 2007

Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Information

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LANGUAGE: eng

NlmUniqueID: 101147698

Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Keywords Mesh Terms:

KEYWORDS: Xenograft Model Antitumor Assays

MESH TERMS: metabolism

Chemical & Substance for Abstract: Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model. Information

Substance Name: Receptor, Bradykinin B2

Registry Number: 0

Grant and Affiliation Information for Calcium-activated potassium channels mediated blood-brain tumor barrier opening in a rat metastatic brain tumor model.

AFFILIATION: Department of Neurosurgery, Maxine Dunitz Neurosurgical Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA. huj@cshs.org

Country: England

AGENCY: United States NCRR

GRANT: RR13707

ACRONYM: RR

MEDLINETA: Mol Cancer

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