Title

Characteristics of cartilage engineered from human pediatric auricular cartilage

UMMS Affiliation

Department of Anesthesiology

Faculty Mentor

Charles Vacanti

Publication Date

1999-03-24

Document Type

Article

Subjects

Absorbable Implants; Adolescent; Animals; Cell Differentiation; Cell Division; Cells, Cultured; Child; Chondrocytes; Collagen; Ear Cartilage; Elastin; Humans; Male; Mice; Mice, Nude; Photomicrography; Polyglycolic Acid; Proteoglycans; Reconstructive Surgical Procedures; Time Factors

Disciplines

Plastic Surgery | Surgery

Abstract

In the repair of cartilage defects, autologous tissue offers the advantage of lasting biocompatibility. The ability of bovine chondrocytes isolated from hyaline cartilage to generate tissue-engineered cartilage in a predetermined shape, such as a human ear, has been demonstrated; however, the potential of chondrocytes isolated from human elastic cartilage remains unknown. In this study, the authors examined the multiplication characteristics of human auricular chondrocytes and the ability of these cells to generate new elastic cartilage as a function of the length of time they are maintained in vitro. Human auricular cartilage, harvested from patients 5 to 17 years of age, was digested in collagenase, and the chondrocytes were isolated and cultured in vitro for up to 12 weeks. Cells were trypsinized, counted, and passaged every 2 weeks. Chondrocyte-polymer (polyglycolic acid) constructs were created at each passage and then implanted into athymic mice for 8 weeks. The ability of the cells to multiply in vitro and their ability to generate new cartilage as a function of the time they had been maintained in vitro were studied. A total of 31 experimental constructs from 12 patients were implanted and compared with a control group of constructs without chondrocytes. In parallel, a representative sample of cells was evaluated to determine the presence of collagen. The doubling rate of human auricular chondrocytes in vitro remained constant within the population studied. New tissue developed in 22 of 31 experimental implants. This tissue demonstrated the physical characteristics of auricular cartilage on gross inspection. Histologically, specimens exhibited dense cellularity and lacunae-containing cells embedded in a basophilic matrix. The specimens resembled immature cartilage and were partially devoid of the synthetic material of which the construct had been composed. Analyses for collagen, proteoglycans, and elastin were consistent with elastic cartilage. No cartilage was detected in the control implants. Human auricular chondrocytes multiply well in vitro and possess the ability to form new cartilage when seeded onto a three-dimensional scaffold. These growth characteristics might some day enable chondrocytes isolated from a small auricular biopsy to be expanded in vitro to generate a large, custom-shaped, autologous graft for clinical reconstruction of a cartilage defect, such as for congenital microtia.

DOI of Published Version

10.1097/00006534-199904040-00001

Source

Plast Reconstr Surg. 1999 Apr;103(4):1111-9.

Journal/Book/Conference Title

Plastic and reconstructive surgery

Comments

Medical student Stephen Pap participated in this study as part of the Senior Scholars research program.

Related Resources

Link to Article in PubMed

PubMed ID

10088494

Link to Full Text

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