Relevance of Abnormal KCNN1 Expression and Osmotic Hypersensitivity in Ewing Sarcoma

Ewing sarcoma (EwS) is a rare and highly malignant bone tumor occurring mainly in childhood and adolescence. Physiologically, the bone is a central hub for Ca homeostasis, which is severely disturbed by osteolytic processes in EwS. Therefore, we aimed to investigate how ion transport proteins involv...

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Veröffentlicht in:Cancers 2022-10, Vol.14 (19), p.4819
Hauptverfasser: Fuest, Sebastian, Post, Christoph, Balbach, Sebastian T, Jabar, Susanne, Neumann, Ilka, Schimmelpfennig, Sandra, Sargin, Sarah, Nass, Elke, Budde, Thomas, Kailayangiri, Sareetha, Altvater, Bianca, Ranft, Andreas, Hartmann, Wolfgang, Dirksen, Uta, Rössig, Claudia, Schwab, Albrecht, Pethő, Zoltán
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container_end_page
container_issue 19
container_start_page 4819
container_title Cancers
container_volume 14
creator Fuest, Sebastian
Post, Christoph
Balbach, Sebastian T
Jabar, Susanne
Neumann, Ilka
Schimmelpfennig, Sandra
Sargin, Sarah
Nass, Elke
Budde, Thomas
Kailayangiri, Sareetha
Altvater, Bianca
Ranft, Andreas
Hartmann, Wolfgang
Dirksen, Uta
Rössig, Claudia
Schwab, Albrecht
Pethő, Zoltán
description Ewing sarcoma (EwS) is a rare and highly malignant bone tumor occurring mainly in childhood and adolescence. Physiologically, the bone is a central hub for Ca homeostasis, which is severely disturbed by osteolytic processes in EwS. Therefore, we aimed to investigate how ion transport proteins involved in Ca homeostasis affect EwS pathophysiology. We characterized the expression of 22 candidate genes of Ca -permeable or Ca -regulated ion channels in three EwS cell lines and found the Ca -activated K channel K 2.1 ( ) to be exceptionally highly expressed. We revealed that expression is directly regulated by the disease-driving oncoprotein EWSR1-FL1. Due to its consistent overexpression in EwS, mRNA could be a prognostic marker in EwS. In a large cohort of EwS patients, however, mRNA quantity does not correlate with clinical parameters. Several functional studies including patch clamp electrophysiology revealed no evidence for K 2.1 function in EwS cells. Thus, elevated expression is not translated to K 2.1 channel activity in EwS cells. However, we found that the low K conductance of EwS cells renders them susceptible to hypoosmotic solutions. The absence of a relevant K conductance in EwS thereby provides an opportunity for hypoosmotic therapy that can be exploited during tumor surgery.
doi_str_mv 10.3390/cancers14194819
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The absence of a relevant K conductance in EwS thereby provides an opportunity for hypoosmotic therapy that can be exploited during tumor surgery.</description><subject>Allergic reaction</subject><subject>Allergy</subject><subject>Bone tumors</subject><subject>Calcium channels</subject><subject>Calcium homeostasis</subject><subject>Calcium permeability</subject><subject>Calcium transport</subject><subject>Channel gating</subject><subject>Children</subject><subject>Electrophysiology</subject><subject>Ewing's sarcoma</subject><subject>Ewings sarcoma</subject><subject>FLI-1 protein</subject><subject>Gene expression</subject><subject>Generalized linear models</subject><subject>Genetic aspects</subject><subject>Health aspects</subject><subject>Homeostasis</subject><subject>Hybridization</subject><subject>Ion channels</subject><subject>Medical prognosis</subject><subject>mRNA</subject><subject>Osmosis</subject><subject>Osteolysis</subject><subject>Patients</subject><subject>Potassium 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Abnormal KCNN1 Expression and Osmotic Hypersensitivity in Ewing Sarcoma</atitle><jtitle>Cancers</jtitle><addtitle>Cancers (Basel)</addtitle><date>2022-10-01</date><risdate>2022</risdate><volume>14</volume><issue>19</issue><spage>4819</spage><pages>4819-</pages><issn>2072-6694</issn><eissn>2072-6694</eissn><abstract>Ewing sarcoma (EwS) is a rare and highly malignant bone tumor occurring mainly in childhood and adolescence. 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subjects Allergic reaction
Allergy
Bone tumors
Calcium channels
Calcium homeostasis
Calcium permeability
Calcium transport
Channel gating
Children
Electrophysiology
Ewing's sarcoma
Ewings sarcoma
FLI-1 protein
Gene expression
Generalized linear models
Genetic aspects
Health aspects
Homeostasis
Hybridization
Ion channels
Medical prognosis
mRNA
Osmosis
Osteolysis
Patients
Potassium channels (calcium-gated)
Potassium conductance
Protein transport
Software
Survival analysis
title Relevance of Abnormal KCNN1 Expression and Osmotic Hypersensitivity in Ewing Sarcoma
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