title: Histology and immunohistochemistry study of ovine tendon grafted with cBMSCs and BMMNCs after collagenase-induced tendinitis.
abstract: OBJECTIVE
  The aim of this study was to compare the regeneration abilities of cultured bone marrow mesenchymal cells (cBMSC) and bone marrow mononuclear cells (BMMNC) with fibrin glue, saline solution and sham control in collagenase-induced tendinitis of the Achilles tendon in sheep.
  
  
  METHODS
  Six sheep were recruited randomly to each group: cBMSC, BMMNC, fibrin, saline and sham control. Each group received the relative treatment two weeks after inducing lesions (T(0)). After eight weeks (T(8)) of treatment, the tendons were harvested and evaluated for histomorphology, Collagen type I, III, Cartilage Oligomeric Matrix Protein (COMP) and CD34 positive cells expression.
  
  
  RESULTS
  Histology and immunohistochemistry showed similar capabilities of cBMSC and BMMNC to restore the architecture of fibres and Extra Cellular Matrix (ECM), with a high expression of collagen type I and COMP and a very low expression of collagen type III in treated tendons. The complete architectural disruption of fibres, dramatic reduction of collagen Type I and COMP expression and increase collagen type III expression were commonly observed in tendons treated with fibrin or saline only. The presence of CD34 positive cells was appreciable in the BMMNC group while few cBMSC showed this cluster of differentiation, not expressed in tendons treated with fibrin or saline.
  
  
  CONCLUSIONS
  The data in this study show the efficacy of cBMSC and BMMNC in regenerating tendon tissue after collagenase-induced tendinitis.
authors.affiliation: Dipartimento dell' Emergenza e dei Trapianti di Organi, Sezione di Chirurgia Veterinaria, Facoltà di Medicina Veterinaria, Università degli Studi di Bari, s.p. per Casamassima Km 3, 70010 Valenzano, Bari, Italy. a.crovace@veterinaria.uniba.it
authors.forename: A
authors.initials: A
authors.lastname: Crovace
authors.forename: L
authors.initials: L
authors.lastname: Lacitignola
authors.forename: E
authors.initials: E
authors.lastname: Francioso
authors.forename: G
authors.initials: G
authors.lastname: Rossi
mesh_terms: D000125:Achilles Tendon / Q000276:immunology / Q000473:pathology / Q000601:surgery; D000818:Animals; D018952:Antigens, CD34 / Q000276:immunology; D016026:Bone Marrow Transplantation / Q000379:methods / Q000662:veterinary*; D024042:Collagen Type I / Q000096:biosynthesis / Q000276:immunology; D024061:Collagen Type III / Q000096:biosynthesis / Q000276:immunology; D016326:Extracellular Matrix Proteins; D005337:Fibrin / Q000494:pharmacology; D006023:Glycoproteins; D007150:Immunohistochemistry / Q000662:veterinary*; D064235:Matrilin Proteins; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods / Q000662:veterinary; D011897:Random Allocation; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology / Q000473:pathology / Q000628:therapy*; D052256:Tendinopathy / Q000276:immunology / Q000473:pathology / Q000628:therapy / Q000662:veterinary*
chemical_list: D018952:Antigens, CD34; D024042:Collagen Type I; D024061:Collagen Type III; D016326:Extracellular Matrix Proteins; D006023:Glycoproteins; D064235:Matrilin Proteins; D005337:Fibrin