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A group of researchers from around the world, led by the University of California, Irvine, has found a new type of skeletal tissue that could help make regenerative medicine and tissue engineering more effective.
Most cartilage gets its strength from an extracellular matrix on the outside. But “lipocartilage,” which is found in mammals’ ears, noses, and throats, is made up of fat-filled cells called “lipochondrocytes” that provide super-stable internal support. This keeps the tissue soft and springy, like bubbled wrapping material.
The study, which was released in the journal Science, explains about how lipocartilage cells make and keep their own lipid reservoirs that stay the same size. Lipochondrocytes, in contrast to regular adipocyte fat cells, do not contract or enlarge in reaction to the availability of food.
The stability and adaptability of lipocartilage make it great for flexible body parts like earlobes or the tip of the nose. This opens up exciting new possibilities in regenerative medicine and tissue engineering, especially for treating facial injuries or defects.
At this time, reconstruction of cartilage usually involves taking tissue from the patient’s rib, which is an invasive and painful process. In the future, stem cells could be used to make patient-specific lipochondrocytes, which could then be purified and used to make live cartilage that suits each person’s needs. These engineered tissues could be made to fit perfectly with the help of 3D printing. This opens up new ways to treat birth defects, injuries, and different cartilage diseases.
In 1854, Dr. Franz Leydig discovered lipochondrocytes by finding fat droplets in the cartilage of rat ears. This discovery was mostly lost until now. Researchers at UC Irvine used cutting edge biochemical instruments and imaging techniques to fully understand lipocartilage’s molecular biology, metabolism, and structural role in skeletal tissues.
They also found the genetic process that prevents enzymes from breaking down fats and interrupts new fat molecules from being absorbed. This keeps the lipid stores in lipochondrocytes from being used up. Lipocartilage becomes stiff and brittle when its lipids are taken away. This suggests how important the fat-filled cells are for keeping the tissue’s toughness and flexibility.
The team additionally reported that in some animals, like bats, lipochondrocytes organize into complex shapes, like parallel ridges in their big ears, which may improve hearing by changing the way sound waves travel.
The unique lipid biology of lipocartilage has caused long-held biomechanics beliefs to be questioned and created a huge number of research possibilities.
Learning more about how lipochondrocytes remain stable over time, the molecular processes that control their shape and function, and how cells age are some of the things that research needs to do next. Additionally, the results show that lipids can be used in many different ways besides metabolism and offer novel techniques to use their properties in tissue engineering as well as medicine.
Sources:
Raul Ramos et al. (2025). Superstable lipid vacuoles endow cartilage with its shape and biomechanics. Science. DOI:10.1126/science.ads9960
Viviana Hermosilla Aguayo et al. (2025). A long-ignored skeletal tissue filled with oil, Science. DOI:10.1126/science.adu7943
https://phys.org/news/2025-01-discovery-skeletal-tissue-advances-regenerative.html
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