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Vet Comp Orthop Traumatol 2008; 21(04): 337-342
DOI: 10.3415/VCOT-07-06-0060
Original Research
Schattauer GmbH

Dexamethasone induces apoptosis in proliferative canine tendon cells and chondrocytes

M. A. Hossain
1   Department of Pathology and Parasitology, Chittagong Veterinary and Animal Sciences University, Chittagong City, Bangladesh
2   Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju City, Korea
,
J. Park
2   Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju City, Korea
,
S. H. Choi
2   Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju City, Korea
,
G. Kim
2   Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungbuk National University, Cheongju City, Korea
› Author Affiliations
Further Information

Publication History

Received: 08 June 2007

Accepted 21 February 2008

Publication Date:
19 December 2017 (online)

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Summary

Dexamethasone (Dexa) has been commonly used in humans and domestic animals, particularly in the treatment of tendon injuries and cartilage degeneration. However, it is often associated with tendon rupture and impaired tendon and cartilage healing. In the present study, we investigated Dexa’s in vitro effects on the growth of cell proliferation and the induction of apoptosis in canine Achilles tendon cells and chondrocytes. Cell proliferation after treatment with Dexa for two to six days was quantified by a 2,3-bis{2-methoxy- 4-nitro-5-sulfophenyl}-2H-tetrazolium-5-carboxyanilide inner salt assay (XTT). The results showed that Dexa could inhibit the proliferation of tendon cells and chondrocytes at increasing concentrations (0.1–50 μg/ml) compared with untreated cells. Cell apoptosis was induced by Dexa, as evidenced by the typical nuclear apoptosis using Hoechst 33258 staining. Dexa increased the apoptosis of canine tendon cells and chondrocytes in a time-dependent manner. In canine tendon cells and chondrocytes that were treated with 25 and 50 μg/ml concentration of Dexa, the number of condensed apoptotic nuclei was significantly increased. In addition, culturing with Dexa and the glucocorticoid receptor blocker, mifepristone, significantly arrested apoptosis of tendon cells and chondrocytes. Based on our in vitro data, we hypothesized that in vivo treatment with glucocorticoids may diminish the proliferation of tendon and cartilage cells by increasing apoptosis and suppressing the proliferation. Our findings suggest that Dexa could be used with caution in dogs with articular or tendon problems.

Keywords

Dexamethasone - apoptosis - proliferation - canine tendon cells - chondrocytes
 

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