Related Experiment Videos
Changes in lncRNA NORAD expression reflect stiffness-associated phenotypic alterations in human chondrocytes
Kyoung-Mi Lee1, Seongyun Choi2, Su-Eun Yang3
1Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, 03722, South Korea; Brain Korea 21 FOUR Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, South Korea.
Biochemical and Biophysical Research Communications
|August 10, 2026
Summary
The long non-coding RNA NORAD reflects how substrate stiffness affects human chondrocyte (cartilage cell) phenotype. NORAD expression may help assess mechanical culture conditions for maintaining chondrocyte health.
Area of Science:
- Biomaterials Science
- Cell Biology
- Rheumatology
Background:
- Mechanical signals from the extracellular matrix are crucial for chondrocyte homeostasis.
- Disruptions in these signals are linked to osteoarthritis (OA) progression.
Purpose of the Study:
- To investigate if the long non-coding RNA NORAD indicates substrate stiffness-associated changes in human chondrocyte phenotype.
- To explore NORAD's role in mechanically defined chondrocyte culture.
Main Methods:
- Human chondrocytes (immortalized and primary) cultured on substrates with varying stiffness (0.2–64 kPa).
- Assessed NORAD expression in relation to substrate stiffness and chondrocyte phenotype.
- Evaluated chondrogenic marker expression and inflammatory/hypertrophic responses.
Main Results:
- NORAD expression varied with substrate stiffness and chondrocyte phenotype.
- Intermediate stiffness (32 and 64 kPa) preserved chondrogenic phenotype and reduced inflammatory responses in primary chondrocytes.
- Stiffness modulation partially restored chondrogenic markers in dedifferentiated chondrocytes, correlating with NORAD changes.
Conclusions:
- NORAD expression serves as an indicator of stiffness-dependent chondrocyte phenotypic alterations.
- NORAD may be a valuable tool for evaluating culture conditions designed to maintain chondrocyte phenotype.
- Findings suggest potential for optimizing cell-based therapies for cartilage repair.
Related Concept Videos
02:39lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
01:37Neural Regulation
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.