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MicroRNA29a regulates IL-33-mediated tissue remodelling in tendon disease.

Millar NL, Gilchrist DS, Akbar M, Reilly JH, Kerr SC, Campbell AL, Murrell GA, Liew FY, Kurowska-Stolarska M, McInnes IB - Nat Commun (2015)

Bottom Line: Both IL-33 effector function, via its decoy receptor sST2, and Col3 synthesis are regulated by miRNA29a.Downregulation of miRNA29a in human tenocytes is sufficient to induce an increase in Col3 expression.These data provide a molecular mechanism of miRNA-mediated integration of the early pathophysiologic events that facilitate tissue remodelling in human tendon after injury.

View Article: PubMed Central - PubMed

Affiliation: Institute of Infection, Immunity and Inflammation, College of Medicine, Veterinary and Life Sciences University of Glasgow, Glasgow G12 8QQ, UK.

ABSTRACT
MicroRNA (miRNA) has the potential for cross-regulation and functional integration of discrete biological processes during complex physiological events. Utilizing the common human condition tendinopathy as a model system to explore the cross-regulation of immediate inflammation and matrix synthesis by miRNA we observed that elevated IL-33 expression is a characteristic of early tendinopathy. Using in vitro tenocyte cultures and in vivo models of tendon damage, we demonstrate that such IL-33 expression plays a pivotal role in the transition from type 1 to type 3 collagen (Col3) synthesis and thus early tendon remodelling. Both IL-33 effector function, via its decoy receptor sST2, and Col3 synthesis are regulated by miRNA29a. Downregulation of miRNA29a in human tenocytes is sufficient to induce an increase in Col3 expression. These data provide a molecular mechanism of miRNA-mediated integration of the early pathophysiologic events that facilitate tissue remodelling in human tendon after injury.

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IL-33/ST2 expression in human tendon.(a) IL-33, (b) soluble ST2 (sST2) and (c) mST2 mRNA expression in human tendon samples. Fold change in gene expression of IL-33, sST2 and mST2 in control (semi-membranosus tendon, n=10), torn supraspinatus tendon (established pathology) and matched subscapularis human tendon samples (early pathology; n=17). Data are mean±s.d. relative to the housekeeping gene18S (mean of duplicate analysis). *P<0.05, **P<0.01, ***P<0.001 versus control (Student's t-test). (d) Immunostaining of IL-33 and ST2 in control (n=10), torn tendon (n=17) and early tendinopathy (n=17). Graphs illustrate modified Bonar scoring based on 10 high-power fields. Data are mean±s.d. *P<0.05, **P<0.01 versus control (Student's t-test). Scale bar, 65 μm. (e) Fold change in gene expression of IL33 and ST2 24 h post incubation with tumour necrosis factor (TNF-α), IL-1β or in combination depicting relative expression to media alone utilizing housekeeping gene GAPDH. Data are mean±s.d. of triplicate samples, representative of three individual patient samples. *P<0.05, **P<0.01 versus control (media) (Student's t-test). (f) IL-33 immunostaining of human tendon explants cultured for 24 h with medium (control), 100 ng ml−1 TNFα or 100 ng ml−1 TNFα+100 ng ml−1 IL-1β. (g) Fold change in COL1 and COL3 mRNA expression in human tendon explants cultured for 24 h with rhIL-33, relative to housekeeping gene GAPDH. (h) Time course of COL1 and COL3 mRNA expression following incubation with rhIL-33, relative to housekeeping gene GAPDH. (i) Collagen 1 and 3 protein expression in human tendon explants 24 h post incubation with rhIL-33. For (g–i) data are mean±s.d. of triplicate samples, representative of three individual patients. *P<0.05, **P<0.01 versus control (Student's t-test).
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f1: IL-33/ST2 expression in human tendon.(a) IL-33, (b) soluble ST2 (sST2) and (c) mST2 mRNA expression in human tendon samples. Fold change in gene expression of IL-33, sST2 and mST2 in control (semi-membranosus tendon, n=10), torn supraspinatus tendon (established pathology) and matched subscapularis human tendon samples (early pathology; n=17). Data are mean±s.d. relative to the housekeeping gene18S (mean of duplicate analysis). *P<0.05, **P<0.01, ***P<0.001 versus control (Student's t-test). (d) Immunostaining of IL-33 and ST2 in control (n=10), torn tendon (n=17) and early tendinopathy (n=17). Graphs illustrate modified Bonar scoring based on 10 high-power fields. Data are mean±s.d. *P<0.05, **P<0.01 versus control (Student's t-test). Scale bar, 65 μm. (e) Fold change in gene expression of IL33 and ST2 24 h post incubation with tumour necrosis factor (TNF-α), IL-1β or in combination depicting relative expression to media alone utilizing housekeeping gene GAPDH. Data are mean±s.d. of triplicate samples, representative of three individual patient samples. *P<0.05, **P<0.01 versus control (media) (Student's t-test). (f) IL-33 immunostaining of human tendon explants cultured for 24 h with medium (control), 100 ng ml−1 TNFα or 100 ng ml−1 TNFα+100 ng ml−1 IL-1β. (g) Fold change in COL1 and COL3 mRNA expression in human tendon explants cultured for 24 h with rhIL-33, relative to housekeeping gene GAPDH. (h) Time course of COL1 and COL3 mRNA expression following incubation with rhIL-33, relative to housekeeping gene GAPDH. (i) Collagen 1 and 3 protein expression in human tendon explants 24 h post incubation with rhIL-33. For (g–i) data are mean±s.d. of triplicate samples, representative of three individual patients. *P<0.05, **P<0.01 versus control (Student's t-test).

Mentions: We first investigated IL-33 expression in human tendinopathy using our previously developed model23. IL33, soluble and membrane-bound ST2 transcripts were significantly upregulated in early tendinopathy compared with control or torn tendon biopsies (Fig. 1a–c). Early tendinopathy tissues exhibited significantly greater staining for IL-33 and ST2 compared with torn tendon or control biopsies (Fig. 1d). Staining was prominent in endothelial cells (CD34+) and particularly fibroblast-like cells, namely tenocytes, which are considered pivotal to the regulation of early tendinopathy (Supplementary Fig. 1a,b). In parallel, in vitro-cultured tenocytes expressed nuclear IL-33 that was upregulated at both the mRNA and protein levels following stimulation by TNF-α and IL-1β (Fig. 1e,f). In contrast, ST2 was constitutively expressed in both resting and unstimulated tenocytes (Supplementary Fig. 1c).


MicroRNA29a regulates IL-33-mediated tissue remodelling in tendon disease.

Millar NL, Gilchrist DS, Akbar M, Reilly JH, Kerr SC, Campbell AL, Murrell GA, Liew FY, Kurowska-Stolarska M, McInnes IB - Nat Commun (2015)

IL-33/ST2 expression in human tendon.(a) IL-33, (b) soluble ST2 (sST2) and (c) mST2 mRNA expression in human tendon samples. Fold change in gene expression of IL-33, sST2 and mST2 in control (semi-membranosus tendon, n=10), torn supraspinatus tendon (established pathology) and matched subscapularis human tendon samples (early pathology; n=17). Data are mean±s.d. relative to the housekeeping gene18S (mean of duplicate analysis). *P<0.05, **P<0.01, ***P<0.001 versus control (Student's t-test). (d) Immunostaining of IL-33 and ST2 in control (n=10), torn tendon (n=17) and early tendinopathy (n=17). Graphs illustrate modified Bonar scoring based on 10 high-power fields. Data are mean±s.d. *P<0.05, **P<0.01 versus control (Student's t-test). Scale bar, 65 μm. (e) Fold change in gene expression of IL33 and ST2 24 h post incubation with tumour necrosis factor (TNF-α), IL-1β or in combination depicting relative expression to media alone utilizing housekeeping gene GAPDH. Data are mean±s.d. of triplicate samples, representative of three individual patient samples. *P<0.05, **P<0.01 versus control (media) (Student's t-test). (f) IL-33 immunostaining of human tendon explants cultured for 24 h with medium (control), 100 ng ml−1 TNFα or 100 ng ml−1 TNFα+100 ng ml−1 IL-1β. (g) Fold change in COL1 and COL3 mRNA expression in human tendon explants cultured for 24 h with rhIL-33, relative to housekeeping gene GAPDH. (h) Time course of COL1 and COL3 mRNA expression following incubation with rhIL-33, relative to housekeeping gene GAPDH. (i) Collagen 1 and 3 protein expression in human tendon explants 24 h post incubation with rhIL-33. For (g–i) data are mean±s.d. of triplicate samples, representative of three individual patients. *P<0.05, **P<0.01 versus control (Student's t-test).
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f1: IL-33/ST2 expression in human tendon.(a) IL-33, (b) soluble ST2 (sST2) and (c) mST2 mRNA expression in human tendon samples. Fold change in gene expression of IL-33, sST2 and mST2 in control (semi-membranosus tendon, n=10), torn supraspinatus tendon (established pathology) and matched subscapularis human tendon samples (early pathology; n=17). Data are mean±s.d. relative to the housekeeping gene18S (mean of duplicate analysis). *P<0.05, **P<0.01, ***P<0.001 versus control (Student's t-test). (d) Immunostaining of IL-33 and ST2 in control (n=10), torn tendon (n=17) and early tendinopathy (n=17). Graphs illustrate modified Bonar scoring based on 10 high-power fields. Data are mean±s.d. *P<0.05, **P<0.01 versus control (Student's t-test). Scale bar, 65 μm. (e) Fold change in gene expression of IL33 and ST2 24 h post incubation with tumour necrosis factor (TNF-α), IL-1β or in combination depicting relative expression to media alone utilizing housekeeping gene GAPDH. Data are mean±s.d. of triplicate samples, representative of three individual patient samples. *P<0.05, **P<0.01 versus control (media) (Student's t-test). (f) IL-33 immunostaining of human tendon explants cultured for 24 h with medium (control), 100 ng ml−1 TNFα or 100 ng ml−1 TNFα+100 ng ml−1 IL-1β. (g) Fold change in COL1 and COL3 mRNA expression in human tendon explants cultured for 24 h with rhIL-33, relative to housekeeping gene GAPDH. (h) Time course of COL1 and COL3 mRNA expression following incubation with rhIL-33, relative to housekeeping gene GAPDH. (i) Collagen 1 and 3 protein expression in human tendon explants 24 h post incubation with rhIL-33. For (g–i) data are mean±s.d. of triplicate samples, representative of three individual patients. *P<0.05, **P<0.01 versus control (Student's t-test).
Mentions: We first investigated IL-33 expression in human tendinopathy using our previously developed model23. IL33, soluble and membrane-bound ST2 transcripts were significantly upregulated in early tendinopathy compared with control or torn tendon biopsies (Fig. 1a–c). Early tendinopathy tissues exhibited significantly greater staining for IL-33 and ST2 compared with torn tendon or control biopsies (Fig. 1d). Staining was prominent in endothelial cells (CD34+) and particularly fibroblast-like cells, namely tenocytes, which are considered pivotal to the regulation of early tendinopathy (Supplementary Fig. 1a,b). In parallel, in vitro-cultured tenocytes expressed nuclear IL-33 that was upregulated at both the mRNA and protein levels following stimulation by TNF-α and IL-1β (Fig. 1e,f). In contrast, ST2 was constitutively expressed in both resting and unstimulated tenocytes (Supplementary Fig. 1c).

Bottom Line: Both IL-33 effector function, via its decoy receptor sST2, and Col3 synthesis are regulated by miRNA29a.Downregulation of miRNA29a in human tenocytes is sufficient to induce an increase in Col3 expression.These data provide a molecular mechanism of miRNA-mediated integration of the early pathophysiologic events that facilitate tissue remodelling in human tendon after injury.

View Article: PubMed Central - PubMed

Affiliation: Institute of Infection, Immunity and Inflammation, College of Medicine, Veterinary and Life Sciences University of Glasgow, Glasgow G12 8QQ, UK.

ABSTRACT
MicroRNA (miRNA) has the potential for cross-regulation and functional integration of discrete biological processes during complex physiological events. Utilizing the common human condition tendinopathy as a model system to explore the cross-regulation of immediate inflammation and matrix synthesis by miRNA we observed that elevated IL-33 expression is a characteristic of early tendinopathy. Using in vitro tenocyte cultures and in vivo models of tendon damage, we demonstrate that such IL-33 expression plays a pivotal role in the transition from type 1 to type 3 collagen (Col3) synthesis and thus early tendon remodelling. Both IL-33 effector function, via its decoy receptor sST2, and Col3 synthesis are regulated by miRNA29a. Downregulation of miRNA29a in human tenocytes is sufficient to induce an increase in Col3 expression. These data provide a molecular mechanism of miRNA-mediated integration of the early pathophysiologic events that facilitate tissue remodelling in human tendon after injury.

Show MeSH
Related in: MedlinePlus