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Published on: January 7, 2019
Effect of lesion size on the metabolic activity of tibial dyschondroplastic chondrocytes
1Department of Poultry Science, Pennsylvania State University, University Park 16802-3501.
Abstract:
Experiments were conducted to determine the influence of lesion size and method of producing tibial dyschondroplasia on metabolic activity of cultured chondrocytes. Genetic selection was one method used to produce a high incidence of tibial dyschondroplasia. Chondrocytes obtained from severe lesions exhibited reduced mitogenic activity (3H-thymidine incorporation) and ability to synthesize matrix proteoglycans (35SO4 incorporation) when compared with normal growth plate and smaller lesions. When a commercial broiler strain was used, all chondrocytes isolated from lesions induced by feeding thiram had reduced metabolic activity. Similar results were observed with severe lesions obtained from copper-deficient chicks. It is concluded that lesion size is an important factor in determining subsequent metabolic activity of chondrocytes isolated from tibial dyschondroplastic lesions.
Insights
Tibial dyschondroplasia lesion size significantly impacts chondrocyte metabolic activity. Severe lesions reduce cell proliferation and matrix proteoglycan synthesis, regardless of the cause.
Area of Science:
- Veterinary Pathology
- Cell Biology
- Biochemistry
Background:
- Tibial dyschondroplasia (TD) is a common leg abnormality in poultry.
- Understanding the cellular mechanisms underlying TD is crucial for improving animal welfare and production.
- Previous studies have indicated metabolic alterations in TD, but the role of lesion size and induction method requires further investigation.
Purpose of the Study:
- To investigate how lesion size and different methods of inducing tibial dyschondroplasia affect the metabolic activity of cultured chondrocytes.
- To compare the metabolic function of chondrocytes from severe TD lesions versus normal growth plates and smaller lesions.
Main Methods:
- Culturing chondrocytes isolated from tibial dyschondroplastic lesions of varying sizes.
- Utilizing genetic selection, thiram feeding, and copper deficiency to induce TD.
- Assessing chondrocyte metabolic activity through [3H]-thymidine incorporation (mitogenic activity) and [35S]O4 incorporation (proteoglycan synthesis).
Main Results:
- Chondrocytes from severe TD lesions showed significantly reduced [3H]-thymidine and [35S]O4 incorporation compared to normal growth plates and smaller lesions.
- All chondrocytes from thiram-induced TD lesions exhibited reduced metabolic activity.
- Severe lesions from copper-deficient chicks also displayed reduced chondrocyte metabolic activity.
Conclusions:
- Lesion size is a critical determinant of chondrocyte metabolic activity in tibial dyschondroplasia.
- Both genetic and induced forms of TD, particularly severe lesions, lead to impaired chondrocyte function.
- These findings highlight the cellular dysfunction associated with severe TD and its potential impact on skeletal development.
