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Tendinosis-like changes in denervated rat Achilles tendon
Umeå universitet, Medicinska fakulteten, Institutionen för integrativ medicinsk biologi (IMB), Anatomi.
Umeå universitet, Medicinska fakulteten, Institutionen för integrativ medicinsk biologi (IMB), Anatomi.
Umeå universitet, Medicinska fakulteten, Institutionen för integrativ medicinsk biologi (IMB), Anatomi. Umeå universitet, Medicinska fakulteten, Institutionen för samhällsmedicin och rehabilitering, Fysioterapi.ORCID-id: 0000-0002-6091-3982
2018 (Engelska)Ingår i: BMC Musculoskeletal Disorders, E-ISSN 1471-2474, Vol. 19, artikel-id 426Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background: Tendon disorders are common and lead to significant disability and pain. Our knowledge of the ‘tennis elbow’, the ‘jumpers knee’, and Achilles tendinosis has increased over the years, but changes in denervated tendons is yet to be described in detail. The aim of the present study was to investigate the morphological and biochemical changes in tendon tissue following two weeks of denervation using a unilateral sciatic nerve transection model in rat Achilles tendons.

Methods: Tendons were compared with respect to cell number, nuclear roundness, and fiber structure. The non-denervated contralateral tendon served as a control. Also, the expression of neuromodulators such as substance P and its preferred receptor neurokinin-1 receptor, NK-1R, was evaluated using real-time qRT-PCR.

Results: Our results showed that denervated tendons expressed morphological changes such as hypercellularity; disfigured cells; disorganization of the collagen network; increased production of type III collagen; and increased expression of NK-1R.

Conclusion: Taken together these data provide new insights into the histopathology of denervated tendons showing that denervation causes somewhat similar changes in the Achilles tendon as does tendinosis in rats.

Ort, förlag, år, upplaga, sidor
BMC , 2018. Vol. 19, artikel-id 426
Nyckelord [en]
Collagen, Denervation, Rat, Substance P, Tendinosis
Nationell ämneskategori
Ortopedi
Identifikatorer
URN: urn:nbn:se:umu:diva-154940DOI: 10.1186/s12891-018-2353-7ISI: 000451699800006PubMedID: 30497469Scopus ID: 2-s2.0-85057541287OAI: oai:DiVA.org:umu-154940DiVA, id: diva2:1276341
Tillgänglig från: 2019-01-08 Skapad: 2019-01-08 Senast uppdaterad: 2024-01-17Bibliografiskt granskad
Ingår i avhandling
1. Cell therapy for denervated tissue
Öppna denna publikation i ny flik eller fönster >>Cell therapy for denervated tissue
2020 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Background: Peripheral nerve injury results in denervation of tendons and muscles. The biology of denervated muscle has been well studied but little is known about the associated tendons. Denervation of muscle leads to atrophy which includes muscle fiber shrinkage and cell death, a process that is influenced by the lack of acetylcholine (ACh) signaling to the muscle cells. Recovery of long-term denervated muscle function is often poor. This thesis describes how a cell therapy approach using adipose tissue-derived stromal vascular fraction (SVF) may be used to protect and regenerate denervated muscle. Previous studies have shown how adipose tissue-dervied stem cells (ASCs), commonly expanded from the SVF, have pro-regenerative effects on the injured peripheral nervous system, and how ASCs differentiated towards a “Schwann cell-like phenotype” (dASCs) reduce muscle atrophy. In this thesis work, we studied the possible mechanisms underlying the regenerative potential of both SVF and culture expanded dASCs.

Hypotheses: We hypothesized that: 1) denervated tendon displays morphological and biochemical properties that resemble the chronic degenerative tendon condition known as tendinosis; 2) denervated muscle up-regulates expression of muscarinic acetylcholine (ACh) receptors and apoptosis-associated signaling mechanisms; 3) dASCs enhance the proliferation of myoblasts in vitro through secretion of ACh; 4) SVF influences the proliferation, differentiation, and survival of myoblasts in vitro via secretion of growth factors; and 5) SVF can preserve denervated muscle tissue. To test our hypotheses, two model systems were used: an in vitro model based on indirect co-culture, and an in vivo rat sciatic nerve transection model.

Results: Denervated tendon displayed morphological changes similar to tendinosis, including hypercellularity, disfigurement of cells, and disorganized collagen architecture, along with an increased expression of type I and type III collagen. In addition, levels of neurokinin 1 receptor (NK-1R) were upregulated in the tendon cells. In denervated muscle, there was an increased expression of muscarinic ACh receptors, as well as of genes associated with apoptosis, such as caspases, cytokines (e.g., tumor necrosis factor-alpha; TNF-a), and death domain receptors. We subsequently used TNF-aas an inducer of apoptosis in an in vitrorat primary myoblast culture model. TNF-aactivated/cleaved caspase 7 and increased poly ADP-ribose polymerase (PARP) levels. Moreover, Annexin V and TUNEL were increased after TNF-atreatment. Indirect co-culture with SVF significantly reduced all these measures of apoptosis. Proliferation studies showed that both dASCs and SVF enhanced growth of myoblasts in vitro. With dASCs, the effect was partially explained by secretion of ACh, and for SVF by released growth factors, such as hepatocyte growth factor (HGF). In both cases, the signal was mediated via phosphorylation of ERK1/2 (MAPK). HGF also had an inhibitory effect on the differentiation of myoblasts into myotubes. Finally, the protective effects of SVF were confirmed in vivo: injections of SVF into denervated muscle significantly increased the mean fiber area and diameter, as well as reduced the expression of apoptotic genes and TUNEL reactivity.

ConclusionsDenervated tendons undergo severe degenerative changes similar to tendinosis. Furthermore, SVF has the ability to reduce muscle atrophy in vivo. Using in vitro systems, we showed that this might occur through secretion of growth factors which activate MAPK signaling and anti-apoptotic pathways. In conclusion, SVF offers a promising approach for future clinical application in the treatment of denervated muscle.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2020. s. 91
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 2077
Nyckelord
adipose tissue-derived stem cell, cell therapy, denervation, differentiation, myoblast, peripheral nerve injury, proliferation, regeneration, skeletal muscle, stromal vascular fraction, survival, tendon
Nationell ämneskategori
Medicinsk bioteknologi (med inriktning mot cellbiologi (inklusive stamcellsbiologi), molekylärbiologi, mikrobiologi, biokemi eller biofarmaci)
Forskningsämne
cellforskning; medicinsk cellbiologi
Identifikatorer
urn:nbn:se:umu:diva-169793 (URN)978-91-7855-228-3 (ISBN)978-91-7855-229-0 (ISBN)
Disputation
2020-05-14, Medicinskt Biologiskt Centrum, Aula Biologica, Umeå, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

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Tillgänglig från: 2020-04-23 Skapad: 2020-04-20 Senast uppdaterad: 2020-04-21Bibliografiskt granskad

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El-Habta, RoineChen, JialinBackman, Ludvig J.

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