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Direct observation of cholesterol monohydrate crystallization.

Dipayan Chakraborty1, Wenchuan Ma1, Xiqu Wang2

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Cholesterol crystals grow via classical layer spreading, but abundant macrosteps slow growth. This self-inhibition mechanism offers new insights into cholesterol crystallization in diseases like atherosclerosis.

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atomic force microscopycholesterol monohydratecrystal growthmicrofluidics

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Area of Science:

  • Biochemistry
  • Crystallography
  • Materials Science

Background:

  • Cholesterol crystallization is implicated in atherosclerosis and gallstones.
  • Mechanisms governing cholesterol crystal growth remain poorly understood.

Purpose of the Study:

  • To elucidate the real-time dynamics of cholesterol monohydrate crystal growth.
  • To identify the mechanisms driving crystal surface morphology and growth rates.

Main Methods:

  • Utilized a biomimetic water-isopropanol solvent system for controlled crystallization.
  • Employed in situ techniques including time-resolved imaging and atomic force microscopy (AFM).
  • Conducted microfluidics measurements to analyze crystal growth dynamics.

Main Results:

  • Cholesterol monohydrate crystals exhibit classical growth via nucleation and layer spreading.
  • Crystal growth is mediated by dislocations and monomer diffusion along the surface.
  • Abundant macrosteps were observed, leading to a self-inhibition of crystal growth.

Conclusions:

  • Cholesterol crystal growth follows classical mechanisms but is uniquely regulated by self-inhibition.
  • Understanding these growth dynamics is crucial for addressing cholesterol-related pathologies.
  • The findings provide a novel perspective on crystal growth regulation in biological systems.