Articular cartilage is a smooth and elastic tissue that covers the surfaces of bone ends. It makes it possible for joints to move painlessly and with minimal friction. In a condition called osteoarthritis, this protective layer gradually deteriorates and gets thinner, while other parts of the joint, for example, the bone and the synovial membrane, also undergo changes. This can result in pain, stiffness and increasingly severe limitations in movement. Although this condition is extremely common, there is no proven treatment available at present that can reliably halt or reverse the structural damage to the cartilage.
Csaba Matta and his co-authors investigated what kinds of cells actually make up articular cartilage and how these cells may contribute to the maintenance of healthy cartilage or to the development and progression of cartilage degeneration or joint inflammation for that matter. It is now increasingly clear that cartilage health depends on the coordinated functioning of various groups of cartilage cells.
- The formerly established and accepted approach viewed cartilage cells as more or less uniform but, in recent years, the high-resolution methods that have become widespread in biological research allowed the function of individual cells to be examined one by one. Single-cell RNA sequencing enables us to see which genes are active in each individual cell. This provides a much more refined picture of which cell groups are present in the healthy and the diseased cartilage tissue, how they change during the processes of aging, inflammation or osteoarthritis, and how they might respond to new therapeutic approaches. This field is developing extremely rapidly, so we felt it was important to summarize the available findings within a unified framework,” said Csaba Matta, Assistant Professor at the Institute of Anatomy, Histology and Embryology at the University of Debrecen’s Faculty of Medicine, to hirek.unideb.hu.
The review article was published in Nature Reviews Rheumatology, one of the leading journals in this specific field. The authors of the article analyzed and synthesized the results of single-cell-level cartilage research already published by various research groups around the world. Csaba Matta and his teaching assistant co-author, Roland Takács, worked together with researchers from Finland, Israel, Great Britain, Canada and Switzerland who are involved in conducting groundbreaking research in the fields of cartilage biology, osteoarthritis, cartilage regeneration and single-cell technologies.
- The most important discovery is that cartilage cells cannot be regarded as a homogeneous group of cells. There are cells that are important for the structure and maintenance of the cartilage tissue, while others are associated with inflammatory or degradative processes and still others may indicate regenerative potential. If this balance is upset, it can contribute to cartilage degeneration and the development of pain in the joints. Our long-term goal is to identify the cell groups and molecular processes that can be targeted therapeutically- said Csaba Matta.
The authors of the review article emphasize that a more precise and detailed molecular classification of cartilage degeneration could help to understand why not all patients respond the same way to the same treatment. It is thus conceivable that, in the future, treatments will target not simply “cartilage degeneration” but its specific cellular and molecular subtypes. It is also important that the authors already see that, in addition to tests that provide genetic information at the single-cell level, the next step for them will be to map up the spatial location, protein content and metabolic state of the cells. This may help them understand exactly where a given cell is located within the cartilaginous tissue, what sort of environmental influences it is exposed to, and how and when it becomes a driver of disease from being a protector of the tissue.
- Our review article synthesizes the basic research knowledge that could serve as a point of departure for future therapies. Nevertheless, there are still a lot of steps we need to take in order to get there. To put it lightly, clinical application is not a close possibility but rather a long-term objective. This objective, however, is extremely important. We do not merely want to alleviate pain but to be able to influence the biological process of the disease itself- said the assistant professor of the University of Debrecen.
Csaba Matta’s research activity was recently recognized officially when he became the recipient of a Publication Award from the University of Debrecen and the Count István Tisza Foundation for the University of Debrecen.
- This award really means quite a lot to me. On the one hand, it provides feedback that our work addresses a scientific issue that is important on an international level and could impact the quality of life for so many people in the long run. On the other hand, it also reinforces my belief that it is indeed worthwhile to set ambitious goals, to think in terms of international collaboration, and to ask questions that, while seemingly belonging to basic research at first glance, may eventually become really significant from a therapeutic perspective. It may also send a message to young researchers and students about how, through hard work, strong joint collaborative efforts and staunch adherence to high professional standards, you can become an important part of the international scientific dialogue even from Hungary. I trust that this will encourage others, too, to dare to tackle ambitious research problems of international interest and to publish their findings in prestigious journals- said the researcher.
At present, Csaba Matta resides in South Korea, working as a research fellow at Wonkwang University. His research focuses on peroxisomes, which are small cell organelles. Peroxisomes play an important part in cellular metabolism and in protecting cells against oxidative stress, but their role in the formation and maintenance of cartilage tissue or its inflammatory diseases is still far from fully understood. Csaba Matta and his fellow researchers focus on investigating how the way peroxisomes operate influences the development, metabolism and inflammatory responses of chondrocyte populations. In the long run, their research efforts along this line of may reveal new connections between cartilage damage and cellular metabolic processes in the joints, which could also lead to new therapeutic targets.
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