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Sigma-2 receptor as potential indicator of stem cell differentiation.


ABSTRACT: PURPOSE:The sigma-2 (?(2)) receptor is a potential biomarker of proliferative status of solid tumors. Specific synthetic probes using N-substituted-9-azabicyclo [3.3.1]nonan-3?-yl carbamate analogs have been designed and implemented for experimental cancer diagnosis and therapy. PROCEDURES:We employed the fluorescently labeled ?(2) receptor probe, SW120, to evaluate ?(2) receptor expression in human stem cells (SC), including: bone marrow stromal, neural progenitor, amniotic fluid, hematopoetic, and embryonic stem cells. We concurrently evaluated the intensity of SW120 and 5-ethynyl-2'-deoxyuridine (EdU) relative to passage number and multi-potency. RESULTS:We substantiated significantly higher ?(2) receptor density among proliferating SC relative to lineage-restricted cell types. Additionally, cellular internalization of the ?(2) receptor in SC was consistent with receptor-mediated endocytosis and confocal microscopy indicated SW120 specific co-localization with a fluorescent marker of lysosomes in all SC imaged. CONCLUSION:These results suggest that ?(2) receptors may serve to monitor stem cell differentiation in future experimental studies.

SUBMITTER: Haller JL 

PROVIDER: S-EPMC3164741 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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Sigma-2 receptor as potential indicator of stem cell differentiation.

Haller Jodi L JL   Panyutin Irina I   Chaudhry Aneeka A   Zeng Chenbo C   Mach Robert H RH   Frank Joseph A JA  

Molecular imaging and biology 20120601 3


<h4>Purpose</h4>The sigma-2 (σ(2)) receptor is a potential biomarker of proliferative status of solid tumors. Specific synthetic probes using N-substituted-9-azabicyclo [3.3.1]nonan-3α-yl carbamate analogs have been designed and implemented for experimental cancer diagnosis and therapy.<h4>Procedures</h4>We employed the fluorescently labeled σ(2) receptor probe, SW120, to evaluate σ(2) receptor expression in human stem cells (SC), including: bone marrow stromal, neural progenitor, amniotic fluid  ...[more]

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