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Dietrich, Franciele
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Bernhardsson, M., Dietrich, F., Tätting, L., Eliasson, P. & Aspenberg, P. (2019). Depletion of cytotoxic (CD8+) T cells impairs implant fixation in rat cancellous bone. Journal of Orthopaedic Research, 37(4), 805-811
Open this publication in new window or tab >>Depletion of cytotoxic (CD8+) T cells impairs implant fixation in rat cancellous bone
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2019 (English)In: Journal of Orthopaedic Research, ISSN 0736-0266, E-ISSN 1554-527X, Vol. 37, no 4, p. 805-811Article in journal (Refereed) Published
Abstract [en]

As cytotoxic (CD8(+)) T cells seem to impair shaft fracture healing, we hypothesized that depletion of CD8(+) cells would instead improve healing of cancellous bone. Additionally, we also tested if CD8-depletion would influence the healing of ruptured Achilles tendons. Rats received a single injection of either anti-CD8 antibodies or saline and put through surgery 24 h later. Three different surgical interventions were performed as follows: (1) a drill hole in the proximal tibia with microCT (BV/TV) to assess bone formation; (2) a screw in the proximal tibia with mechanical evaluation (pull-out force) to assess fracture healing; (3) Achilles tendon transection with mechanical evaluation (force-at-failure) to assess tendon healing. Furthermore, CD8-depletion was confirmed with flow cytometry on peripheral blood. Flow cytometric analysis confirmed depletion of CD8(+) cells (p amp;lt; 0.001). Contrary to our hypothesis, depletion of CD8(+) cells reduced the implant pull-out force by 19% (p amp;lt; 0.05) and stiffness by 34% (p amp;lt; 0.01), although the bone formation in the drill holes was the same as in the controls. Tendon healing was unaffected by CD8-depletion. Our results suggest that CD8(+) cells have an important part in cancellous bone healing.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
bone healing; cancellous; tendon healing; cytotoxic T cells; CD8 depletion
National Category
Orthopaedics
Identifiers
urn:nbn:se:liu:diva-157559 (URN)10.1002/jor.24246 (DOI)000467082100001 ()30737834 (PubMedID)2-s2.0-85062344231 (Scopus ID)
Note

Funding Agencies|Swedish Research Council [2031-47-5]; AFA insurance company EU 159 7th framework program [FP7/2007-2013, 279239]; Linkoping 160 University

Available from: 2019-06-22 Created: 2019-06-22 Last updated: 2019-06-25Bibliographically approved
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