Preclinical Studies

TITLE: “Mechanical versus enzymatic isolation of stromal vascular fraction cells from adipose tissue”

SOURCE: Aronowitz JA, Lockhart RA, Hakakian CS. Mechanical versus enzymatic isolation of stromal vascular fraction cells from adipose tissue. Springerplus. 2015 Nov 23;4:713.

SUMMARY: Clinical use of adipose-derived stem cells (ASCs) for a variety of indications is rapidly expanding in medicine. Most commonly, ASCs are isolated at the point of care from lipoaspirate tissue as the stromal vascular fraction (SVF). The cells are immediately administered to the patient as an injection or used to enrich fat grafts. Isolation of ASCs from adipose tissue is a relatively simple process performed routinely in cell biology laboratories, but isolation at the point of care for immediate clinical administration requires special methodology to prevent contamination, ensure integrity of clinical research and comply with regulatory requirements. A lack of practical laboratory experience, regulatory uncertainty and a relative paucity of objective published data can make selection of the optimum separation method for specific indications a difficult task for the clinician and can discourage clinical adoption. In this paper, we discuss the processes which can be used to separate SVF cells from fat tissue. We compare the various mechanical and enzymatic methods. We discuss the practical considerations involved in selecting an appropriate method from a clinical perspective. Studies consistently show that breakdown of the extracellular matrix achieved with proteolytic enzymes affords significantly greater efficiency to the separation process. SVF isolated through mechanical methods is equally safe, less costly and less time consuming but the product contains a higher frequency of blood mononuclear cells and fewer progenitor cells. Mechanical methods can provide a low cost, rapid and simple alternative to enzymatic isolation methods, and are attractive when smaller quantities of ASCs are sufficient.


TITLE: “Use of Freshly Isolated Human Adipose Stromal Cells for Clinical Applications”

SOURCE: Lockhart RA, Aronowitz JA, Dos-Anjos Vilaboa S. Use of Freshly Isolated Human Adipose Stromal Cells for Clinical Applications. Aesthet Surg J. 2017 Jul 1;37(suppl_3):S4-S8.

SUMMARY: The clinical use of adipose-derived cells is being explored very actively around the world for various human diseases. Adipose tissue is an abundant tissue source that can be easily harvested using liposuction. Human lipoaspirates contain a significant amount of mesenchymal stromal cells, as well as other progenitors and terminally differentiated cell types. This review covers the isolation of adipose stromal vascular fraction (SVF), the quality control and safety analysis of freshly isolated cell suspensions. The comparison between freshly isolated stromal cells and culture expanded cells from adipose tissue samples is also highlighted. This article provides a brief but comprehensive review about SVF isolation in the clinical setting, cell characterization, and biological potency of freshly obtained adipose stromal cells.