Experimental Diabetes Alters the Morphology and Nano-Structure of the Achilles Tendon

Although of several studies that associate chronic hyperglycemia with tendinopathy, the connection between morphometric changes as witnessed by magnetic resonance (MR) images, nanostructural changes, and inflammatory markers have not yet been fully established. Therefore, the present study has as a...

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Veröffentlicht in:PloS one 2017-01, Vol.12 (1), p.e0169513-e0169513
Hauptverfasser: Oliveira, Rodrigo Ribeiro de, Medina de Mattos, Rômulo, Magalhães Rebelo, Luciana, Guimarães Meireles Ferreira, Fernanda, Tovar-Moll, Fernanda, Eurico Nasciutti, Luiz, de Castro Brito, Gerly Anne
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creator Oliveira, Rodrigo Ribeiro de
Medina de Mattos, Rômulo
Magalhães Rebelo, Luciana
Guimarães Meireles Ferreira, Fernanda
Tovar-Moll, Fernanda
Eurico Nasciutti, Luiz
de Castro Brito, Gerly Anne
description Although of several studies that associate chronic hyperglycemia with tendinopathy, the connection between morphometric changes as witnessed by magnetic resonance (MR) images, nanostructural changes, and inflammatory markers have not yet been fully established. Therefore, the present study has as a hypothesis that the Achilles tendons of rats with diabetes mellitus (DM) exhibit structural changes. The animals were randomly divided into two experimental groups: Control Group (n = 06) injected with a vehicle (sodium citrate buffer solution) and Diabetic Group (n = 06) consisting of rats submitted to intraperitoneal administration of streptozotocin. MR was performed 24 days after the induction of diabetes and images were used for morphometry using ImageJ software. Morphology of the collagen fibers within tendons was examined using Atomic Force microscopy (AFM). An increase in the dimension of the coronal plane area was observed in the diabetic group (8.583 ± 0.646 mm2/100g) when compared to the control group (4.823 ± 0.267 mm2/100g) resulting in a significant difference (p = 0.003) upon evaluating the Achilles tendons. Similarly, our analysis found an increase in the size of the transverse section area in the diabetic group (1.328 ± 0.103 mm2/100g) in comparison to the control group (0.940 ± 0.01 mm2/100g) p = 0.021. The tendons of the diabetic group showed great irregularity in fiber bundles, including modified grain direction and jagged junctions and deformities in the form of collagen fibrils bulges. Despite the morphological changes observed in the Achilles tendon of diabetic animals, IL1 and TNF-α did not change. Our results suggest that DM promotes changes to the Achilles tendon with important structural modifications as seen by MR and AFM, excluding major inflammatory changes.
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Therefore, the present study has as a hypothesis that the Achilles tendons of rats with diabetes mellitus (DM) exhibit structural changes. The animals were randomly divided into two experimental groups: Control Group (n = 06) injected with a vehicle (sodium citrate buffer solution) and Diabetic Group (n = 06) consisting of rats submitted to intraperitoneal administration of streptozotocin. MR was performed 24 days after the induction of diabetes and images were used for morphometry using ImageJ software. Morphology of the collagen fibers within tendons was examined using Atomic Force microscopy (AFM). An increase in the dimension of the coronal plane area was observed in the diabetic group (8.583 ± 0.646 mm2/100g) when compared to the control group (4.823 ± 0.267 mm2/100g) resulting in a significant difference (p = 0.003) upon evaluating the Achilles tendons. 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source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; Public Library of Science (PLoS)
subjects Achilles tendon
Achilles Tendon - diagnostic imaging
Achilles Tendon - pathology
Achilles Tendon - ultrastructure
Animals
Atomic force microscopy
Atomic structure
Biology and Life Sciences
Biomechanics
Buffer solutions
Bulging
Citric acid
Collagen
Complications and side effects
Deformation
Diabetes
Diabetes mellitus
Diabetes Mellitus, Experimental - complications
Diabetes Mellitus, Experimental - diagnostic imaging
Fibrils
Foot diseases
Grain
Hyperglycemia
Inflammation
Injuries
Interleukin 1
Laboratory animals
Magnetic induction
Magnetic resonance
Magnetic resonance imaging
Magnetic Resonance Spectroscopy
Male
Medicine and Health Sciences
Microscopy
Microscopy, Atomic Force
Morphology
Morphology (Biology)
Morphometry
Nanostructures - chemistry
Rats
Rats, Wistar
Research and Analysis Methods
Risk factors
Rodents
Science
Sodium
Sodium citrate
Streptozocin
Tendinopathy - diagnostic imaging
Tendinopathy - etiology
Tendinopathy - pathology
Tendinosis
Tendons
Tumor necrosis factor-α
title Experimental Diabetes Alters the Morphology and Nano-Structure of the Achilles Tendon
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