Autologous Adipose-Derived Tissue Matrix Part I: Biologic Characteristics

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Tissue Engineering

Background:

• Autologous collagen is a promising soft tissue filler and a matrix for stem cell applications.
• Limited availability of autologous collagen sources has hindered its widespread use.
• Liposuction, a common procedure, presents a potential source for autologous collagen procurement.

Purpose of the Study:

• To characterize the collagen content and composition of adipose-derived tissue.
• To evaluate an adipose-derived tissue product created using ultrasonic cavitation and cryo-grinding.
• To assess the cellular and protein composition of the final collagen matrix product.

Main Methods:

• Adipose tissue was obtained from patients undergoing liposuction.
• A two-step process involving ultrasonic cavitation and cryo-grinding was used to isolate connective tissue.
• The resulting collagen matrix was analyzed using scanning electron microscopy, Western blot, and flow cytometry.

Main Results:

• An average of 1 mL of collagen matrix was obtained per 100 mL of liposuctioned fat.
• Significant viable cell markers were identified, including adipocytes, CD90+, and CD105+.
• Western blot analysis confirmed the presence of collagen types II, III, and IV, while electron microscopy revealed a cross-linked helical collagen structure.

Conclusions:

• Liposuctioned fat can be processed to yield a collagen matrix with viable cells using ultrasonic separation.
• The process preserves the overall cellular composition of the tissue.
• This autologous collagen matrix holds potential for soft tissue restoration and regenerative therapies with long-term benefits.