Abstract
We recently developed a simultaneous in situ quantitative imaging technique for cholesterol in both leaflets of the plasma membrane of mammalian cells. This ratiometric fluorescence technique allows real-time monitoring of the cholesterol transporter activity of plasma membrane-resident proteins in living cells. When applied to the hedgehog signaling system, it enables direct quantitative measurement of the cholesterol transporter activity of Patched1 and the effect of the hedgehog ligand on this activity.
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Abbreviations
- DMSO:
-
Dimethylsulfoxide
- GUVs:
-
Giant unilamellar vesicles
- Hh:
-
Hedgehog
- IPM:
-
Inner leaflet of plasma membrane
- OPM:
-
Outer leaflet of plasma membrane
- PI:
-
Phosphatidylinositol
- PM:
-
Plasma membrane
- POPC:
-
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
- POPE:
-
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine
- POPS:
-
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoserine
- PTCH1:
-
Patched1; PtdIns(4,5)P2, phosphatidylinositol-4,5-bisphosphate
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Acknowledgments
The work is supported by a National Institutes of Health grant R35GM122530.
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Cho, W., Ralko, A., Sharma, A. (2022). An In Situ Fluorescence Assay for Cholesterol Transporter Activity of the Patched. In: Li, X. (eds) Hedgehog Signaling. Methods in Molecular Biology, vol 2374. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1701-4_4
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DOI: https://doi.org/10.1007/978-1-0716-1701-4_4
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