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Mammary epithelial cell and adipocyte co-culture in a 3-D matrix: The first step towards tissue-engineered human breast tissue
Linköping University, Department of Clinical and Experimental Medicine, Burn Unit . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Reconstruction Centre, Department of Plastic Surgery, Hand surgery UHL.
Linköping University, Department of Clinical and Experimental Medicine, Plastic Surgery, Hand Surgery and Burns . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Reconstruction Centre, Department of Plastic Surgery, Hand surgery UHL.
2001 (English)In: Cells Tissues Organs, ISSN 1422-6405, Vol. 169, no 4, 361-367 p.Article in journal (Refereed) Published
Abstract [en]

Reconstruction of the female breast after cancer surgery is a demanding task where the methods used today suffer from several disadvantages. In the present study we have investigated the possibility to use tissue engineering methods to regenerate human autologous breast tissue. Human mammary epithelial cells and preadipocytes were derived from breast tissue biopsies from healthy women undergoing reduction mammoplasty, and the two celltypes were co-cultured with conventional cell culture methods as well as in 3-D matrices. The study shows that it is possible to harvest both human mammary epithelial cells and preadipocytes in a single session, propagate several subcultures, and that the cells maintain a normal intercellular distribution and growth-pattern when co-cultured in a 3-D collagen gel. We propose that growth and formation of a tissue closely resembling normal human breast tissue be readily obtained in the described in vitro cell culture set-up using basic tissue engineering principles. This concept may be of great importance in the development of new methods for reconstruction of the human breast.

Place, publisher, year, edition, pages
2001. Vol. 169, no 4, 361-367 p.
Keyword [en]
Tissue engineering, Adipocyte, Mammary epithelial cell, Breast tissue
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-14344DOI: 10.1159/000047903OAI: oai:DiVA.org:liu-14344DiVA: diva2:23281
Available from: 2007-03-16 Created: 2007-03-16 Last updated: 2009-08-18
In thesis
1. In vitro and in vivo studies of tissue engineering in reconstructive plastic surgery
Open this publication in new window or tab >>In vitro and in vivo studies of tissue engineering in reconstructive plastic surgery
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

To correct, improve, and maintain tissues, and their functions, are common denominators in tissue engineering and reconstructive plastic surgery. This can be achieved by using autolo-gous tissues as in flaps or transplants. However, often autologous tissue is not useable. This is one of the reasons for the increasing interest among plastic surgeons for tissue engineering, and it has led to fruitful cross-fertilizations between the fields. Tissue engineering is defined as an interdisciplinary field that applies the principles of engineering and life sciences for development of biologic substitutes designed to maintain, restore, or improve tissue functions. These methods have already dramatically improved the possibilities to treat a number of medical conditions, and can arbitrarily be divided into two main principles:

> Methods where autologous cells are cultured in vitro and transplanted by means of a cell suspension, a graft, or in a 3-D biodegradable matrix as carrier.

> Methods where the tissue of interest is stimulated and given the right prerequisites to regenerate the tissue in vivo/situ with the assistance of implantation of specially designed materials, or application of substances that regulate cell functions - guided tissue regeneration.

We have shown that human mammary epithelial cells and adipocytes could be isolated from tissue biopsies and that the cells kept their proliferative ability. When co-cultured in a 3-D matrix, patterns of ductal structures of epithelial cells embedded in clusters of adipocytes, mimicking the in vivo architecture of human breast tissue, were seen. This indicated that human autologous breast tissue can be regenerated in vitro.

The adipose tissue is also generally used to correct soft tissue defects e.g. by autologous fat transplantation. Alas 30-70% of the transplanted fat is commonly resorbed. Preadipocytes are believed to be hardier and also able to replicate, and hence, are probably more useful for fat transplantation. We showed that by using cell culture techniques, significantly more pre-adipocytes could survive and proliferate in vitro compared to two clinically used techniques of fat graft handling. Theoretically, a biopsy of fat could generate enough preadipocytes to seed a biodegradable matrix that is implanted to correct a defect. The cells in the matrix will replicate at a rate that parallels the vascular development, the matrix subsequently degrades and the cell-matrix complex is replaced by regenerated, vascularized adipose tissue.

We further evaluated different biodegradable scaffolds usable for tissue engineering of soft tissues. A macroporous gelatin sphere showed several appealing characteristics. A number of primary human ecto- and mesodermal cells were proven to thrive on the gelatin spheres when cultured in spinner flasks. As the spheres are biodegradable, it follows that the cells can be cultured and expanded on the same substrate that functions as a transplantation vehicle and scaffold for tissue engineering of soft tissues.

To evaluate the in vivo behavior of cells and gelatin spheres, an animal study was performed where human fibroblasts and preadipocytes were cultured on the spheres and injected intra-dermally. Cell-seeded spheres were compared with injections of empty spheres and cell suspensions. The pre-seeded spheres showed a near complete regeneration of the soft tissues with neoangiogenesis. Some tissue regeneration was seen also in the ‘naked’ spheres but no effect was shown by cell injections.

In a human pilot-study, intradermally injected spheres were compared with hyaluronan. Volume-stability was inferior to hyaluronan but a near complete regeneration of the dermis was proven, indicating that the volume-effect is permanent in contrast to hyaluronan which eventually will be resorbed. Further studies are needed to fully evaluate the effect of the macroporous gelatin spheres, with or without cellular pre-seeding, as a matrix for guided tissue regeneration. However, we believe that the prospect to use these spheres as an injectable, 3D, biodegradable matrix will greatly enhance our possibilities to regenerate tissues through guided tissue regeneration.

Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 905
Keyword
Tissue engineering, plastic surgery, guided tissue regeneration
National Category
Surgery
Identifiers
urn:nbn:se:liu:diva-8504 (URN)91-85299-06-5 (ISBN)
Public defence
2005-09-02, Berzeliussalen, Hälsouniversitetet, Linköping, 09:00 (English)
Opponent
Supervisors
Note
On the day of the defence date the status of article V was In Press.Available from: 2007-03-16 Created: 2007-03-16 Last updated: 2009-08-23

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Huss, Fredrik R.M.Kratz, Gunnar

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Burn Unit Faculty of Health SciencesDepartment of Plastic Surgery, Hand surgery UHLPlastic Surgery, Hand Surgery and Burns
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