Allogeneic Serum and Macromolecular Crowding Maintain Native Equine Tenocyte Function in Culture

Equine tenocyte cultures often lose function rapidly in vitro due to missing native extracellular matrix and xenogeneic sera. Traditional culture methods rely on foetal bovine serum, which may not support long-term tenocyte viability. The role of serum type and matrix conditions in maintaining tenocyte function remains unclear. Prior research has shown that xenogeneic sera can lead to reduced cell function over time. No prior work had resolved how allogeneic sera and matrix conditions interact to preserve tenocyte function. This gap motivated an investigation into serum and matrix effects on tenocyte behavior. Understanding these factors could improve in vitro models for tendon repair. The study aimed to clarify how serum and matrix influence tenocyte function during culture.

The study aimed to evaluate how equine tenocyte function is affected by serum type and extracellular matrix conditions. The specific problem is the rapid decline in tenocyte viability and function in traditional culture systems. The motivation is to identify culture conditions that better preserve tenocyte function. The researchers sought to compare equine and foetal bovine sera under varying matrix conditions. They also examined the effects of aging and time in culture. The goal was to determine which conditions best support tenocyte morphology and protein synthesis. This could lead to improved in vitro models for equine tendon research. The findings may inform better cell culture protocols for veterinary applications.

The study used equine tenocytes cultured in equine or foetal bovine sera. Macromolecular crowding was induced to simulate extracellular matrix conditions. Cell morphology, viability, and metabolic activity were measured at different passages and culture times. Readouts included proliferation and protein synthesis levels. The experiment compared traditional culture conditions with modified ones. Cells were analyzed at passages 3, 6, and 9, and at days 3, 5, and 7 in culture. Statistical comparisons were made between conditions to assess function changes. The approach focused on identifying optimal serum and matrix conditions.

Cells in foetal bovine serum without macromolecular crowding showed the most significant function losses. At passage 3 and days 5 and 7, viability and protein synthesis were notably reduced. In contrast, equine serum with macromolecular crowding increased function at passage 3 and 6 on day 7. Traditional culture conditions failed to maintain tenocyte function over time. Macromolecular crowding improved extracellular matrix deposition and cell behavior. Equine serum supported higher metabolic activity and proliferation. The highest number of increased readouts occurred in modified conditions. These results suggest that serum and matrix conditions strongly influence tenocyte function.

The authors propose that allogeneic serum and macromolecular crowding help maintain tenocyte function in culture. Traditional methods using foetal bovine serum and no matrix support led to function decline. The findings suggest that equine serum and extracellular matrix conditions are beneficial. The study supports the use of these conditions for tenocyte expansion. No prior work had resolved the interaction between serum and matrix effects. The results may guide future in vitro studies on equine tendon cells. The authors suggest that these conditions could improve cell culture models. They emphasize the importance of serum and matrix in preserving tenocyte behavior.