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Collagen fibers grow like a sunflower

17.05.2019

Collagen fibrils are the main component of connective tissue. The development of these complex tissues is the subject of various research papers. Now, two researchers from the Paris-Sud University in Orsay, France, have shed light on how complex collagen fibrils form. The authors focus on one of the sequence of steps in which molecules spontaneously bind into long and dense axisymmetric fibers known as type I collagen fibrils.

Connective tissues are multilevel systems that go through several phases of associations, forming fibrillar structures adapted to various functions in living organisms. In this study, the spontaneous association stage under consideration was unique in that the fiber diameter remained constant throughout its growth, and a characteristic parabolic contour appeared at the end of growth. After examining several possible models, the researchers concluded that the most likely explanation is that the fibers are stretching from the axis of the fiber along the stem, similar to how sunflower flowers grow.

The authors note that phyllotaxis, or leaf growth, provides the best possible packing under circular symmetry conditions, as is the case with dense collagen fibers. "However, due to the complexity of the material, appropriate experimental studies are needed, in accordance with the guidelines proposed by the model itself, in order to finally validate it," says Jean Charvolin, co-author of the study.

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