Repopulation of vascularized bone allotransplants with recipient-derived cells: detection by laser capture microdissection and real-time PCR.

Full Abstract

Mechanisms underlying successful composite tissue transplantation must include an analysis of transplant chimerism, which is little studied, particularly in calcified tissue. We have developed a new method enabling determination of lineage of selected cells in our model of vascularized bone allotransplantation. Vascularized femoral allotransplantation was performed from female Dark Agouti (DA) donor rats to male Piebald Virol Glaxo (PVG) recipients, representing a major histocompatibility mismatch. Four groups differed in use of immunosuppression (+/-2 weeks Tacrolimus) and surgical revascularization, by implantation of either a patent or a ligated saphenous arteriovenous (AV) bundle. Results were assessed at 18 weeks. Bone blood flow was measured by the hydrogen washout technique and transverse specimens were prepared for histology. Real-time PCR was performed on DNA from laser capture microdissected cortical bone regions to determine the extent of chimerism. To do so, we analyzed the relative expression ratio of the sex-determining region Y (Sry) gene, specific only for recipient male rat DNA, to the cyclophilin housekeeper gene. Substantial transplant chimerism was seen in cortical bone of all groups (range 77-97%). Rats without immunosuppression and with a patent AV bundle revealed significantly higher chimerism than those with immunosuppression and a ligated AV bundle, which maintained transplant cell viability. We describe a new method to study the extent of chimerism in rat vascularized bone allotransplants, including a sex-mismatched transplantation model, laser capture microdissection of selected bone regions, and calculation of the relative expression ratio. (c) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.

Author information

Author/s: Pelzer, Michael (M); Larsen, Mikko (M); Friedrich, Patricia F (PF); Aleff, Ross A (RA); Bishop, Allen T (AT);

Affiliation: Department of Orthopedic Surgery, Microvascular Research Laboratory, Mayo Clinic, Rochester, Minnesota 55905, USA.

Grants: AR49718 (Agency:NIAMS NIH HHS)

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Extramural

Journal: Journal of orthopaedic research : official publication of the Orthopaedic Research Society (J Orthop Res), published in United States. (Language: eng)

Reference: 2009-Nov; vol 27 (issue 11) : pp 1514-20

Dates: Created 2009/10/21; Completed 2009/11/06;

PMID: 19437510, status: MEDLINE (last retrieval date: 11/6/2009, IMS Date: )

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