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Regional transcriptomics and mechanical properties of rat Achilles tendons

ABSTRACT: Regional transcriptomics and mechanical properties of rat Achilles tendons

PROVIDER: PRJNA796046 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17541012_1.fastq.gz	Fastqsanger.gz
	SRR17541012_2.fastq.gz	Fastqsanger.gz
	SRR17541013_1.fastq.gz	Fastqsanger.gz
	SRR17541013_2.fastq.gz	Fastqsanger.gz
	SRR17541014_1.fastq.gz	Fastqsanger.gz

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Regional transcriptomics and mechanical properties of rat Achilles tendons

Project description:The transcriptome of different tendons varies based on anatomical location and is likely influenced by the biomechanical loading environment. While differences in biologic and mechanical properties of whole tendons have been assessed, less is understood about differences within a tendon along its proximal-distal axis. Therefore, our objective was to determine the characteristics of and relationship between the transcriptomes and mechanical properties of a single tendon.

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Project description:Tendon is a highly aligned connective tissue, in which the macro-structure consists of collagen-rich fascicles surrounded by interfascicular matrix (IFM). In a series of recent studies in equine tissue, we have demonstrated specialisation of tendon composition, structure and mechanics to achieve the tendon’s functional requirements, specifically reporting extensive specialisation of the IFM region in the energy storing superficial digital flexor tendon. We have also demonstrated loss of functional specialisms with ageing, leading to a hypothesised new paradigm for tendinopathy, focused on the importance of the IFM. However, to date, there have been no studies focused on structure-function specialisation or the IFM in functionally distinct human tendons. Here, we compare the positional anterior tibialis tendon and energy storing Achilles tendon, performing a detailed analysis of the composition and mechanical properties of both fascicle and IFM regions, to test the hypothesis that the IFM in the energy storing Achilles tendon has specialised composition and mechanical properties, and that these specialisations are lost with ageing. We demonstrate that the IFM is specialised in the energy storing Achilles tendon, with greater elasticity and fatigue resistance than in the positional anterior tibialis tendon. While there were few age-related alterations in mechanics, we did identify age-related alterations in the IFM proteome of the Achilles tendon specifically, which is predicted to be regulated by TGF-beta signalling and may be responsible for the trend towards decreased fatigue resistance observed in the Achilles IFM with ageing.

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