dc.date.accessioned | 2018-06-27T15:12:52Z | |
dc.date.issued | 2017-01-01 | |
dc.identifier | https://breast-cancer-research.biomedcentral.com/articles/10.1186/s13058-017-0822-9 | |
dc.identifier.citation | BREAST CANCER RESEARCH, 2017, 19 | |
dc.identifier.issn | 1465-5411 | |
dc.identifier.uri | https://repository.icr.ac.uk/handle/internal/1954 | |
dc.description.abstract | Background: Normal myoepithelial cells (MECs) play an important tumour-suppressor role in the breast but display an altered phenotype in ductal carcinoma in situ (DCIS), gaining tumour-promoter functions. Matrix metalloproteinase-8 (MMP-8) is expressed by normal MECs but is lost in DCIS. This study investigated the function of MMP-8 in MECs and the impact of its loss in DCIS. Methods: Primary normal and DCIS-associated MECs, and normal (N-1089) and DCIS-modified myoepithelial (a6-1089) cell lines, were used to assess MMP-8 expression and function. a6-1089 lacking MMP-8 were transfected with MMP-8 WT and catalytically inactive MMP-8 EA, and MMP-8 in N-1089 MEC was knocked down with siRNA. The effect on adhesion and migration to extracellular matrix (ECM), localisation of a6 beta 4 integrin to hemidesmosomes (HD), TGF-beta signalling and gelatinase activity was measured. The effect of altering MEC MMP-8 expression on tumour cell invasion was investigated in 2D and 3D organotypic models. Results: Assessment of primary cells and MEC lines confirmed expression of MMP-8 in normal MEC and its loss in DCIS-MEC. Over-expression of MMP-8 WT but not MMP-8 EA in a6-1089 cells increased adhesion to ECM proteins and reduced migration. Conversely, knock-down of MMP-8 in N-1089 reduced adhesion and increased migration. Expression of MMP-8 WT in a6-1089 led to greater localisation of a6 beta 4 to HD and reduced retraction fibre formation, this being reversed by MMP-8 knock-down in N-1089. Over-expression of MMP-8 WT reduced TGF-beta signalling and gelatinolytic activity. MMP-8 knock-down enhanced TGF-beta signalling and gelatinolytic activity, which was reversed by blocking MMP-9 by knock-down or an inhibitor. MMP-8 WT but not MMP-8 EA over-expression in a6-1089 reduced breast cancer cell invasion in 2D and 3D invasion assays, while MMP-8 knock-down in N-1089 enhanced cancer cell invasion. Staining of breast cancer cases for MMP-8 revealed a statistically significant loss of MMP-8 expression in DCIS with invasion versus pure DCIS (p = 0.001). Conclusions: These data indicate MMP-8 is a vital component of the myoepithelial tumour-suppressor function. It restores MEC interaction with the matrix, opposes TGF-beta signalling and MMP-9 proteolysis, which contributes to inhibition of tumour cell invasion. Assessment of MMP-8 expression may help to determine risk of DCIS progression. | |
dc.language | eng | |
dc.language.iso | eng | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0 | |
dc.subject | Ductal carcinoma in situ Myoepithelial cell Microenvironment MMP-8 Adhesion Hemidesmosomes Organotypic assays Invasion BREAST-CANCER PROGRESSION MATRIX METALLOPROTEINASE-8 ALPHA-6-BETA-4 INTEGRIN COLLAGENASE-2 MMP-8 BETA-4 INTEGRIN EXPRESSION MICE MICROENVIRONMENT HEMIDESMOSOMES SUPPRESSOR | |
dc.title | Loss of MMP-8 in ductal carcinoma in situ ( DCIS)-associated myoepithelial cells contributes to tumour promotion through altered adhesive and proteolytic function | |
dc.type | Journal Article | |
rioxxterms.licenseref.uri | https://creativecommons.org/licenses/by/4.0 | |
rioxxterms.licenseref.startdate | 2017 | |
rioxxterms.type | Journal Article/Review | |
dc.relation.isPartOf | BREAST CANCER RESEARCH | |
pubs.notes | ISI Document Delivery No.: EO9SF Times Cited: 0 Cited Reference Count: 70 Sarper, Muge Allen, Michael D. Gomm, Jenny Haywood, Linda Decock, Julie Thirkettle, Sally Ustaoglu, Ahsen Sarker, Shah-Jalal Marshall, John Edwards, Dylan R. Jones, J. Louise Breast Cancer Now; Breast Cancer Now Tissue Bank Cell Culture Programme none Background: Normal myoepithelial cells (MECs) play an important tumour-suppressor role in the breast but display an altered phenotype in ductal carcinoma in situ (DCIS), gaining tumour-promoter functions. Matrix metalloproteinase-8 (MMP-8) is expressed by normal MECs but is lost in DCIS. This study investigated the function of MMP-8 in MECs and the impact of its loss in DCIS. Methods: Primary normal and DCIS-associated MECs, and normal (N-1089) and DCIS-modified myoepithelial (a6-1089) cell lines, were used to assess MMP-8 expression and function. a6-1089 lacking MMP-8 were transfected with MMP-8 WT and catalytically inactive MMP-8 EA, and MMP-8 in N-1089 MEC was knocked down with siRNA. The effect on adhesion and migration to extracellular matrix (ECM), localisation of a6 beta 4 integrin to hemidesmosomes (HD), TGF-beta signalling and gelatinase activity was measured. The effect of altering MEC MMP-8 expression on tumour cell invasion was investigated in 2D and 3D organotypic models. Results: Assessment of primary cells and MEC lines confirmed expression of MMP-8 in normal MEC and its loss in DCIS-MEC. Over-expression of MMP-8 WT but not MMP-8 EA in a6-1089 cells increased adhesion to ECM proteins and reduced migration. Conversely, knock-down of MMP-8 in N-1089 reduced adhesion and increased migration. Expression of MMP-8 WT in a6-1089 led to greater localisation of a6 beta 4 to HD and reduced retraction fibre formation, this being reversed by MMP-8 knock-down in N-1089. Over-expression of MMP-8 WT reduced TGF-beta signalling and gelatinolytic activity. MMP-8 knock-down enhanced TGF-beta signalling and gelatinolytic activity, which was reversed by blocking MMP-9 by knock-down or an inhibitor. MMP-8 WT but not MMP-8 EA over-expression in a6-1089 reduced breast cancer cell invasion in 2D and 3D invasion assays, while MMP-8 knock-down in N-1089 enhanced cancer cell invasion. Staining of breast cancer cases for MMP-8 revealed a statistically significant loss of MMP-8 expression in DCIS with invasion versus pure DCIS (p = 0.001). Conclusions: These data indicate MMP-8 is a vital component of the myoepithelial tumour-suppressor function. It restores MEC interaction with the matrix, opposes TGF-beta signalling and MMP-9 proteolysis, which contributes to inhibition of tumour cell invasion. Assessment of MMP-8 expression may help to determine risk of DCIS progression. | |
pubs.notes | Not known | |
pubs.organisational-group | /ICR | |
pubs.organisational-group | /ICR/Primary Group | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions/Cancer Therapeutics | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions/Cancer Therapeutics/Translational Cancer Discovery | |
pubs.organisational-group | /ICR | |
pubs.organisational-group | /ICR/Primary Group | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions/Cancer Therapeutics | |
pubs.organisational-group | /ICR/Primary Group/ICR Divisions/Cancer Therapeutics/Translational Cancer Discovery | |
pubs.volume | 19 | |
pubs.embargo.terms | Not known | |
icr.researchteam | Translational Cancer Discovery | |
dc.contributor.icrauthor | Sarper, Muge | |