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Updated: Jul 15, 2026

Cholesterol Efflux Assay

Cholesterol Efflux Assay

Published on: March 6, 2012

Functional analysis of cholesterol biosynthesis by RNA interference.

Christina Guggenberger¹, Denise Ilgen, Jerzy Adamski

¹GSF-National Research Center for Environment and Health, Institute of Experimental Genetics, Genome Analysis Center, Ingolstaedter Landstr. 1, 85764 Neuherberg, Germany.

The Journal of Steroid Biochemistry and Molecular Biology

|May 15, 2007

Summary

This study introduces RNA interference (RNAi) to analyze cholesterol biosynthesis defects. Stable cell lines were created for NSDHL, HSD17B7, and EBP genes, offering new tools for research.

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Cholesterol Efflux Assay

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Published on: March 6, 2012

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

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Published on: March 25, 2020

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Area of Science:

Biochemistry
Molecular Biology
Genetics

Background:

Inborn errors in cholesterol biosynthesis, often due to single enzyme dysfunction, lead to severe congenital malformation syndromes.
Examples include X-linked chondrodysplasia punctata (CDPX2), CHILD syndrome, and Smith-Lemli-Opitz syndrome (SLOS).

Purpose of the Study:

To establish RNA interference (RNAi) as a method for dissecting the molecular mechanisms of disrupted cholesterol biosynthesis.
To develop novel cellular tools for studying cholesterol metabolism defects.

Main Methods:

RNA interference (RNAi) was employed to target key genes in the cholesterol biosynthesis pathway: NAD(P) dependent steroid dehydrogenase-like (NSDHL), 17-beta hydroxysteroid dehydrogenase type 7 (HSD17B7), and emopamil binding protein (EBP).
Effective short hairpin RNA (shRNA) sequences achieving at least 80% knockdown were identified.
These shRNA sequences were stably transfected into a HeLa cell line with tetracycline-regulated expression (HeLa T-REx) for consistent experimental conditions.

Main Results:

Successfully designed and tested shRNA sequences targeting NSDHL, HSD17B7, and EBP genes.
Established stable HeLa T-REx cell lines with high knockdown efficiency (≥80%) for these genes.
These cell lines provide a reproducible system for investigating cholesterol biosynthesis.

Conclusions:

RNA interference is an effective method for analyzing molecular mechanisms in cholesterol biosynthesis.
The developed stable transfected cell lines are valuable novel tools for studying inborn errors of cholesterol metabolism and related syndromes.