MSC response to pH levels found in degenerating intervertebral discs

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Cell Biology

Background:

• Degenerative disc disease (DDD) is a significant health issue.
• Mesenchymal stem cells (MSCs) are crucial for tissue regeneration.
• The disc microenvironment, particularly matrix acidity, poses challenges for MSC survival and function.

Purpose of the Study:

• To investigate the impact of varying pH levels, simulating disc degeneration, on rat bone marrow-derived MSCs.
• To assess the effects of acidity and age on MSC gene expression, proliferation, viability, and morphology.

Main Methods:

• MSCs were isolated from young (<1 month) and adult (4-5 months) Sprague-Dawley rats.
• Cells were cultured for 5 days at four different pH conditions (7.4, 7.1, 6.8, 6.5).
• Gene expression (aggrecan, collagen-1, TIMP-3), proliferation, viability, and cell morphology were analyzed.

Main Results:

• Acidity significantly inhibited aggrecan, collagen-1, and TIMP-3 expression.
• Lower pH levels led to decreased MSC proliferation and viability.
• Cell morphology changed under acidic conditions, with younger MSCs showing higher mRNA expression levels.

Conclusions:

• Acidic conditions, characteristic of degenerated discs, impair MSC function and viability.
• Age influences MSC response, with younger cells exhibiting better mRNA expression.
• Findings highlight the necessity of early therapeutic interventions and MSC predifferentiation for effective DDD treatment.