Ascorbic Acid Attenuates Senescence of Human Osteoarthritic Osteoblasts

Area of Science:

• Biomedical Science
• Cell Biology
• Osteoarthritis Research

Background:

• Cellular senescence contributes to age-related diseases, including osteoarthritis (OA).
• Osteoblast (OB) senescence in OA is understudied, despite potential therapeutic implications.
• Oxidative stress is a known inducer of cellular senescence.

Purpose of the Study:

• To investigate the impact of antioxidant supplementation on osteoblasts from osteoarthritic subchondral bone.
• To assess effects on isolation efficiency, proliferation, differentiation, and gene expression.
• To explore the role of senescent osteoblasts in OA pathology.

Main Methods:

• Harvesting bone chips from human OA joints (sclerotic and non-sclerotic regions).
• Culturing osteoblasts with and without ascorbic acid-2-phosphate (AA).
• Assessing cell counts, proliferation, senescence markers, ROS levels, differentiation potential, and transcriptomic profiles.

Main Results:

• Ascorbic acid-2-phosphate (AA) significantly increased cell isolation and proliferation.
• AA supplementation correlated with reduced senescent cells and reactive oxygen species (ROS).
• Expanded osteoblasts maintained differentiation markers and osteogenic capacity; transcriptomics revealed altered apoptotic, cell cycle, and catabolic pathways.

Conclusions:

• Antioxidant supplementation (AA) effectively expands osteoblasts from OA subchondral bone in vitro.
• AA maintains the characteristic properties of osteoblasts during expansion.
• Clearing senescent osteoblasts presents a potential therapeutic avenue for osteoarthritis treatment.