Our research team has made an exciting breakthrough in understanding how bone cells, called osteocytes, respond to different challenges. Think of osteocytes as the guardians of our bones—they regulate the process of bone renewal triggered by physical activity. We wanted to explore how these cells react under various stressful situations like lack of nutrients, low oxygen levels, and inflammation.
Using advanced techniques like RNA sequencing and other lab tools, we uncovered specific pathways that lead to the death of osteocytes, with a focus on a process called ferroptosis. When osteocytes experienced a lack of nutrients, they followed a unique pathway that eventually led to a type of cell death. On the other hand, how well osteocytes survived depended on the level of oxygen available. At higher oxygen levels, they adapted and activated a survival pathway, while at lower levels, they succumbed to ferroptosis—a process linked to the accumulation of harmful molecules called reactive oxygen species (ROS).
Recognizing that we didn't know much about ferroptosis in osteocytes, we created cell lines where we turned off specific elements related to this process. This allowed us to understand how these elements played a crucial role in the ferroptosis pathway.
We also looked into another pathway called necrosis, which is a secondary event in osteocyte cell death. For a more real-world perspective, we used mice engineered to lack a specific element related to cell death in osteocytes. These mice underwent experiments mimicking arthritis, and we're studying how inflammation, bone structure, and osteocyte survival are affected.
Additionally, we are exploring the role of low oxygen levels in osteocyte cell death by using mice with a specific gene turned off in their osteocytes. This gene is involved in how cells respond to low oxygen, and by turning it off, we can understand its impact on osteocyte survival.
Our research also touched on a molecule called Dectin-1, which seems to be important in the formation of bone-eating cells called osteoclasts. We observed that when cells lacked Dectin-1, they had trouble becoming osteoclasts, and this finding was confirmed in mice with denser bones. Figuring out how Dectin-1 influences osteoclast formation is a key focus of our ongoing research.
Our studies involve both male and female mice exposed to models of arthritis and osteoporosis, and we're currently analyzing a large number of samples. By exploring these various aspects of osteocyte biology and cell death, we aim to deepen our understanding of bone health and diseases related to bones. Ultimately, this knowledge could contribute to advancements in treatments and care for skeletal issues.
