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Related Experiment Video

Updated: Nov 26, 2025

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint
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Published on: July 22, 2021

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RNA Isolation from Articular Cartilage Tissue.

Hongjun Zheng1, Audrey McAlinden2,3,4

  • 1Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, MO, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 14, 2020
PubMed
Summary

Isolating high-quality RNA from challenging cartilage tissue is crucial for gene expression studies. A combined TRIzol and spin column method effectively purifies RNA from human osteoarthritic cartilage for downstream analyses.

Keywords:
Articular cartilageBioanalyzerCartilageChondrocyteNanoDrop™Norgen kitOsteoarthritisRNARNA purificationSpin columnTRIzol®Tissue pulverization

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genomics

Background:

  • Accurate in vivo gene expression profiling requires high-quality RNA isolated directly from tissues, including challenging matrices like cartilage.
  • Cartilage RNA isolation is difficult due to low cellularity and a dense extracellular matrix (ECM) rich in proteoglycans that interfere with purification.
  • Traditional methods involving ultracentrifugation are cumbersome; modern spin column chromatography offers a more user-friendly alternative.

Purpose of the Study:

  • To evaluate and compare three distinct methods for isolating RNA from immature murine articular cartilage.
  • To establish an optimized protocol for obtaining high-quality RNA from human osteoarthritic (OA) cartilage for downstream applications.
  • To demonstrate the feasibility of RNA isolation from human OA cartilage suitable for microarray and RNA-sequencing (RNA-Seq).

Main Methods:

  • Comparison of three RNA isolation techniques from immature murine articular cartilage.
  • Utilized TRIzol reagent in conjunction with the Norgen Total RNA Purification Kit (spin column chromatography).
  • Applied the optimized method to human osteoarthritic knee joint cartilage specimens.

Main Results:

  • The combination of TRIzol reagent and Norgen spin column chromatography yielded the highest quality RNA from murine cartilage, with an average RNA Integrity Number (RIN) of 7.1.
  • Successful isolation of approximately 3 μg of total RNA (including small noncoding RNAs) from 100 mg of human OA cartilage, achieving a RIN of 7.9 from one specimen.
  • Demonstrated significant patient-to-patient variability in RNA yield and quality from human OA cartilage samples.

Conclusions:

  • The TRIzol reagent and spin column chromatography method is highly effective for isolating high-quality RNA from various cartilage tissues, including human OA cartilage.
  • The optimized protocol provides RNA suitable for sensitive downstream analyses such as microarray and RNA-Seq, despite inherent variability in OA samples.
  • This methodology offers a robust approach for gene expression studies in cartilage, overcoming previous isolation challenges.