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Cellular Complexity at the Interface: Challenges in Enthesis Tissue Engineering

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Cell Biology and Translational Medicine, Volume 5

Part of the book series: Advances in Experimental Medicine and Biology ((CBTMED,volume 1144))

Abstract

The complex heterogeneous cellular environment found in tendon-to-bone interface makes this structure a challenge for interface tissue engineering. Orthopedic surgeons still face some problems associated with the formation of fibrotic tissue or re-tear occurring after surgical re-attachment of tendons to the bony insertion or the application of grafts. Unfortunately, an understanding of the cellular component of enthesis lags far behind of other well-known musculoskeletal interfaces, which blocks the development of new treatment options for the healing and regeneration of this multifaceted junction. In this chapter, the main characteristics of tendon and bone cell populations are introduced, followed by a brief description of the interfacial cellular niche, highlighting molecular mechanisms governing tendon-to-bone attachment and mineralization. Finally, we describe and critically assess some challenges faced concerning the use of cell-based strategies in tendon-to-bone healing and regeneration.

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Abbreviations

3D:

Three-dimensional

ACL:

Anterior cruciate ligament

ALP:

Alkaline phosphatase

ASCs:

Adipose-derived stem cells

Bmp/BMP:

Bone morphogenetic protein

Bmpr1a:

Bone morphogenetic protein receptor 1a

BMU:

Basic multicellular unit

BSP:

Bone sialoprotein

ECM:

Extracellular matrix

GDF:

Growth and differentiation factors

Hh:

Hedgehog

IBSP:

Integrin binding sialoprotein

Ihh:

Indian hedgehog

MMP:

Matrix metallopeptidase

MSCs:

Mesenchymal stem cells

OCN:

Osteocalcin

PTHrp:

Parathyroid hormone-related protein

RUNX2:

Runt-related transcription factor 2

Scx/SCX:

Scleraxis

Smo:

Smoothened

Sox9:

Sex-determining region Y-box 9

TCs:

Tenocytes

TDSCs:

Tendon-derived stem cells

TgfbrII:

Transforming growth factor beta receptor II

TGFß:

Transforming growth factor beta

TSPCs:

Tendon stem/progenitor cells

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Correspondence to Manuela E. Gomes .

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Calejo, I., Costa-Almeida, R., Gomes, M.E. (2019). Cellular Complexity at the Interface: Challenges in Enthesis Tissue Engineering. In: Turksen, K. (eds) Cell Biology and Translational Medicine, Volume 5. Advances in Experimental Medicine and Biology(), vol 1144. Springer, Cham. https://doi.org/10.1007/5584_2018_307

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