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Publications (10 of 32) Show all publications
Dennhag, N., Kahsay, A., Nissen, I., Nord, H., Chermenina, M., Liu, J., . . . Domellöf, F. P. (2024). fhl2b mediates extraocular muscle protection in zebrafish models of muscular dystrophies and its ectopic expression ameliorates affected body muscles. Nature Communications, 15(1), Article ID 1950.
Open this publication in new window or tab >>fhl2b mediates extraocular muscle protection in zebrafish models of muscular dystrophies and its ectopic expression ameliorates affected body muscles
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2024 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 1950Article in journal (Refereed) Published
Abstract [en]

In muscular dystrophies, muscle fibers loose integrity and die, causing significant suffering and premature death. Strikingly, the extraocular muscles (EOMs) are spared, functioning well despite the disease progression. Although EOMs have been shown to differ from body musculature, the mechanisms underlying this inherent resistance to muscle dystrophies remain unknown. Here, we demonstrate important differences in gene expression as a response to muscle dystrophies between the EOMs and trunk muscles in zebrafish via transcriptomic profiling. We show that the LIM-protein Fhl2 is increased in response to the knockout of desmin, plectin and obscurin, cytoskeletal proteins whose knockout causes different muscle dystrophies, and contributes to disease protection of the EOMs. Moreover, we show that ectopic expression of fhl2b can partially rescue the muscle phenotype in the zebrafish Duchenne muscular dystrophy model sapje, significantly improving their survival. Therefore, Fhl2 is a protective agent and a candidate target gene for therapy of muscular dystrophies.

Place, publisher, year, edition, pages
Springer Nature, 2024
National Category
Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-222359 (URN)10.1038/s41467-024-46187-x (DOI)38431640 (PubMedID)2-s2.0-85186557555 (Scopus ID)
Available from: 2024-03-15 Created: 2024-03-15 Last updated: 2024-03-15Bibliographically approved
Kahsay, A., Dennhag, N., Liu, J.-X., Nord, H., Rönnbäck, H., Thorell, A. E., . . . Domellöf, F. P. (2024). Obscurin maintains myofiber identity in extraocular muscles. Investigative Ophthalmology and Visual Science, 65(2), Article ID 19.
Open this publication in new window or tab >>Obscurin maintains myofiber identity in extraocular muscles
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2024 (English)In: Investigative Ophthalmology and Visual Science, ISSN 0146-0404, E-ISSN 1552-5783, Vol. 65, no 2, article id 19Article in journal (Refereed) Published
Abstract [en]

Purpose: The cytoskeleton of the extraocular muscles (EOMs) is significantly different from that of other muscles. We aimed to investigate the role of obscurin, a fundamental cytoskeletal protein, in the EOMs.

Methods: The distribution of obscurin in human and zebrafish EOMs was compared using immunohistochemistry. The two obscurin genes in zebrafish, obscna and obscnb, were knocked out using CRISPR/Cas9, and the EOMs were investigated using immunohistochemistry, qPCR, and in situ hybridization. The optokinetic reflex (OKR) in five-day-old larvae and adult obscna−/−;obscnb−/− and sibling control zebrafish was analyzed. Swimming distance was recorded at the same age.

Results: The obscurin distribution pattern was similar in human and zebrafish EOMs. The proportion of slow and fast myofibers was reduced in obscna−/−;obscnb−/− zebrafish EOMs but not in trunk muscle, whereas the number of myofibers containing cardiac myosin myh7 was significantly increased in EOMs of obscurin double mutants. Loss of obscurin resulted in less OKRs in zebrafish larvae but not in adult zebrafish.

Conclusions: Obscurin expression is conserved in normal human and zebrafish EOMs. Loss of obscurin induces a myofiber type shift in the EOMs, with upregulation of cardiac myosin heavy chain, myh7, showing an adaptation strategy in EOMs. Our model will facilitate further studies in conditions related to obscurin.

Place, publisher, year, edition, pages
Association for Research in Vision and Ophthalmology, 2024
Keywords
extraocular muscles, myofiber, myosin heavy chain 7, obscurin, zebrafish
National Category
Ophthalmology
Identifiers
urn:nbn:se:umu:diva-218165 (URN)10.1167/iovs.65.2.19 (DOI)38334702 (PubMedID)2-s2.0-85184789466 (Scopus ID)
Funder
Swedish Research Council, 2018-02401Umeå UniversityRegion VästerbottenUmeå University, FS 2.1.6-1911-22Stiftelsen Kronprinsessan Margaretas arbetsnämnd för synskadade
Note

Originally included in thesis in manuscript form. 

Available from: 2023-12-18 Created: 2023-12-18 Last updated: 2024-03-05Bibliographically approved
Deiana, M., Andrés Castán, J. M., Josse, P., Kahsay, A., Sánchez, D. P., Morice, K., . . . Sabouri, N. (2023). A new G-quadruplex-specific photosensitizer inducing genome instability in cancer cells by triggering oxidative DNA damage and impeding replication fork progression. Nucleic Acids Research, 51(12), 6264-6285
Open this publication in new window or tab >>A new G-quadruplex-specific photosensitizer inducing genome instability in cancer cells by triggering oxidative DNA damage and impeding replication fork progression
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2023 (English)In: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962, Vol. 51, no 12, p. 6264-6285Article in journal (Refereed) Published
Abstract [en]

Photodynamic therapy (PDT) ideally relies on the administration, selective accumulation and photoactivation of a photosensitizer (PS) into diseased tissues. In this context, we report a new heavy-atom-free fluorescent G-quadruplex (G4) DNA-binding PS, named DBI. We reveal by fluorescence microscopy that DBI preferentially localizes in intraluminal vesicles (ILVs), precursors of exosomes, which are key components of cancer cell proliferation. Moreover, purified exosomal DNA was recognized by a G4-specific antibody, thus highlighting the presence of such G4-forming sequences in the vesicles. Despite the absence of fluorescence signal from DBI in nuclei, light-irradiated DBI-treated cells generated reactive oxygen species (ROS), triggering a 3-fold increase of nuclear G4 foci, slowing fork progression and elevated levels of both DNA base damage, 8-oxoguanine, and double-stranded DNA breaks. Consequently, DBI was found to exert significant phototoxic effects (at nanomolar scale) toward cancer cell lines and tumor organoids. Furthermore, in vivo testing reveals that photoactivation of DBI induces not only G4 formation and DNA damage but also apoptosis in zebrafish, specifically in the area where DBI had accumulated. Collectively, this approach shows significant promise for image-guided PDT.

Place, publisher, year, edition, pages
Oxford University Press, 2023
National Category
Biochemistry and Molecular Biology Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-212227 (URN)10.1093/nar/gkad365 (DOI)000988008500001 ()37191066 (PubMedID)2-s2.0-85164253573 (Scopus ID)
Funder
Swedish Cancer Society, 22 2380 PjSwedish Research Council, VR-MH 2021–02468Knut and Alice Wallenberg Foundation, KAW 2021-0173Swedish Cancer Society, 21 0302 PT 01 HWenner-Gren Foundations, UPD2020-0097Swedish Cancer Society, 20 0827 PjFCancerforskningsfonden i Norrland, LP 22-2312Cancerforskningsfonden i Norrland, LP20 1024 2257Cancerforskningsfonden i Norrland, LP 21–2298Swedish Research Council, 2017-01531Swedish Society of Medicine, SLS-890521Region Västerbotten, RV-930167Sjöberg FoundationKnut and Alice Wallenberg Foundation, KAW 2015.0114Marianne and Marcus Wallenberg Foundation, MMW 2020.0189Swedish Cancer Society, 20 1339 PjF
Available from: 2023-07-21 Created: 2023-07-21 Last updated: 2023-07-21Bibliographically approved
Nord, H., Kahsay, A., Dennhag, N., Domellöf, F. P. & von Hofsten, J. (2022). Genetic compensation between Pax3 and Pax7 in zebrafish appendicular muscle formation. Developmental Dynamics, 251(9), 1423-1438
Open this publication in new window or tab >>Genetic compensation between Pax3 and Pax7 in zebrafish appendicular muscle formation
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2022 (English)In: Developmental Dynamics, ISSN 1058-8388, E-ISSN 1097-0177, Vol. 251, no 9, p. 1423-1438Article in journal (Refereed) Published
Abstract [en]

Background: Migrating muscle progenitors delaminate from the somite and subsequently form muscle tissue in distant anatomical regions such as the paired appendages, or limbs. In amniotes, this process requires a signaling cascade including the transcription factor paired box 3 (Pax3).

Results: In this study, we found that, unlike in mammals, pax3a/3b double mutant zebrafish develop near to normal appendicular muscle. By analyzing numerous mutant combinations of pax3a, pax3b and pax7a, and pax7b, we determined that there is a feedback system and a compensatory mechanism between Pax3 and Pax7 in this developmental process, even though Pax7 alone is not required for appendicular myogenesis. pax3a/3b/7a/7b quadruple mutant developed muscle-less pectoral fins.

Conclusions: We found that Pax3 and Pax7 are redundantly required during appendicular myogenesis in zebrafish, where Pax7 is able to activate the same developmental programs as Pax3 in the premigratory progenitor cells.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
Keywords
appendicular myogenesis, limb development, muscle regeneration
National Category
Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-187293 (URN)10.1002/dvdy.415 (DOI)000691719300001 ()34435397 (PubMedID)2-s2.0-85113911054 (Scopus ID)
Funder
Swedish Cancer SocietyUmeå University
Note

Special Issue

Available from: 2021-09-07 Created: 2021-09-07 Last updated: 2023-12-18Bibliographically approved
Kahsay, A., Rodriguez-Marquez, E., López-Pérez, A. R., Hörnblad, A. & von Hofsten, J. (2022). Pax3 loss of function delays tumour progression in kRAS-induced zebrafish rhabdomyosarcoma models. Scientific Reports, 12(1), Article ID 17149.
Open this publication in new window or tab >>Pax3 loss of function delays tumour progression in kRAS-induced zebrafish rhabdomyosarcoma models
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 17149Article in journal (Refereed) Published
Abstract [en]

Rhabdomyosarcoma is a soft tissue cancer that arises in skeletal muscle due to mutations in myogenic progenitors that lead to ineffective differentiation and malignant transformation. The transcription factors Pax3 and Pax7 and their downstream target genes are tightly linked with the fusion positive alveolar subtype, whereas the RAS pathway is usually involved in the embryonal, fusion negative variant. Here, we analyse the role of Pax3 in a fusion negative context, by linking alterations in gene expression in pax3a/pax3b double mutant zebrafish with tumour progression in kRAS-induced rhabdomyosarcoma tumours. Several genes in the RAS/MAPK signalling pathway were significantly down-regulated in pax3a/pax3b double mutant zebrafish. Progression of rhabdomyosarcoma tumours was also delayed in the pax3a/pax3b double mutant zebrafish indicating that Pax3 transcription factors have an unappreciated role in mediating malignancy in fusion negative rhabdomyosarcoma.

Place, publisher, year, edition, pages
Nature Publishing Group, 2022
National Category
Cancer and Oncology Medical Genetics
Identifiers
urn:nbn:se:umu:diva-203323 (URN)10.1038/s41598-022-21525-5 (DOI)000867889200055 ()36229514 (PubMedID)2-s2.0-85139945677 (Scopus ID)
Available from: 2023-01-18 Created: 2023-01-18 Last updated: 2023-01-18Bibliographically approved
Dennhag, N., Liu, J.-X., Nord, H., von Hofsten, J. & Domellöf, F. P. (2020). Absence of Desmin in Myofibers of the Zebrafish Extraocular Muscles. Translational Vision Science & Technology, 9(10), Article ID 1.
Open this publication in new window or tab >>Absence of Desmin in Myofibers of the Zebrafish Extraocular Muscles
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2020 (English)In: Translational Vision Science & Technology, E-ISSN 2164-2591, Vol. 9, no 10, article id 1Article in journal (Refereed) Published
Abstract [en]

Purpose: To study the medial rectus (MR) muscle of zebrafish (Danio rerio) with respect to the pattern of distribution of desmin and its correlation to distinct types of myofibers and motor endplates.

Methods: The MRs of zebrafish were examined using confocal microscopy in whole-mount longitudinal specimens and in cross sections processed for immunohistochemistry with antibodies against desmin, myosin heavy chain isoforms, and innervation markers. Desmin patterns were correlated to major myofiber type and type of innervation. A total of 1382 myofibers in nine MR muscles were analyzed.

Results: Four distinct desmin immunolabeling patterns were found in the zebrafish MRs. Approximately a third of all slow myofibers lacked desmin, representing 8.5% of the total myofiber population. The adult zebrafish MR muscle displayed en grappe, en plaque, and multiterminal en plaque neuromuscular junctions (NMJs) with intricate patterns of desmin immunolabeling.

Conclusions: The MRs of zebrafish showed important similarities with the human extraocular muscles with regard to the pattern of desmin distribution and presence of the major types of NMJs and can be regarded as an adequate model to further study the role of desmin and the implications of heterogeneity in cytoskeletal protein composition.

Translational Relevance: The establishment of a zebrafish model to study the cytoskeleton in muscles that are particularly resistant to muscle disease opens new avenues to understand human myopathies and muscle dystrophies and may provide clues to new therapies.

Place, publisher, year, edition, pages
Association for Research in Vision and Ophthalmology, 2020
Keywords
extraocular muscles, desmin, neuromuscular junction, myosin heavy chain, zebrafish, multiterminal en plaque endplates
National Category
Ophthalmology
Identifiers
urn:nbn:se:umu:diva-177160 (URN)10.1167/tvst.9.10.1 (DOI)000587388500001 ()32953241 (PubMedID)2-s2.0-85093896190 (Scopus ID)
Available from: 2020-12-08 Created: 2020-12-08 Last updated: 2023-12-18Bibliographically approved
Tran, P., Wanrooij, P. H., Lorenzon, P., Sharma, S., Thelander, L., Nilsson, A. K., . . . Chabes, A. (2019). De novo dNTP production is essential for normal postnatal murine heart development. Journal of Biological Chemistry, 394(44), 15889-15897, Article ID jbc.RA119.009492.
Open this publication in new window or tab >>De novo dNTP production is essential for normal postnatal murine heart development
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2019 (English)In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 394, no 44, p. 15889-15897, article id jbc.RA119.009492Article in journal (Refereed) Published
Abstract [en]

The building blocks of DNA, dNTPs, can be produced de novo or can be salvaged from deoxyribonucleosides. However, to what extent the absence of de novo dNTP production can be compensated for by the salvage pathway is unknown. Here, we eliminated de novo dNTP synthesis in the mouse heart and skeletal muscle by inactivating ribonucleotide reductase (RNR), a key enzyme for the de novo production of dNTPs, at embryonic day 13. All other tissues had normal de novo dNTP synthesis and theoretically could supply heart and skeletal muscle with deoxyribonucleosides needed for dNTP production by salvage. We observed that the dNTP and NTP pools in wild-type postnatal hearts are unexpectedly asymmetric, with unusually high dGTP and GTP levels compared with those in whole mouse embryos or murine cell cultures. We found that RNR inactivation in heart led to strongly decreased dGTP and increased dCTP, dTTP, and dATP pools; aberrant DNA replication; defective expression of muscle-specific proteins; progressive heart abnormalities; disturbance of the cardiac conduction system; and lethality between the second and fourth weeks after birth. We conclude that dNTP salvage cannot substitute for de novo dNTP synthesis in the heart and that cardiomyocytes and myocytes initiate DNA replication despite an inadequate dNTP supply. We discuss the possible reasons for the observed asymmetry in dNTP and NTP pools in wildtype hearts.

Place, publisher, year, edition, pages
American Society for Biochemistry and Molecular Biology, 2019
Keywords
cardiac function, cardiac muscle, dNTP metabolism, dNTP salvage, deoxyribonucleoside kinases, desmin, heart development, nucleoside/nucleotide biosynthesis, nucleoside/nucleotide metabolism, ribonucleotide reductase
National Category
Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-161767 (URN)10.1074/jbc.RA119.009492 (DOI)000499478600002 ()31300555 (PubMedID)2-s2.0-85074444850 (Scopus ID)
Funder
Swedish Research CouncilSwedish Cancer Society
Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2023-03-24Bibliographically approved
Nord, H., Dennhag, N., Tydinger, H. & von Hofsten, J. (2019). The zebrafish HGF receptor met controls migration of myogenic progenitor cells in appendicular development. PLOS ONE, 14(7), Article ID e0219259.
Open this publication in new window or tab >>The zebrafish HGF receptor met controls migration of myogenic progenitor cells in appendicular development
2019 (English)In: PLOS ONE, E-ISSN 1932-6203, Vol. 14, no 7, article id e0219259Article in journal (Refereed) Published
Abstract [en]

The hepatocyte growth factor receptor C-met plays an important role in cellular migration, which is crucial for many developmental processes as well as for cancer cell metastasis. Cmet has been linked to the development of mammalian appendicular muscle, which are derived from migrating muscle progenitor cells (MMPs) from within the somite. Mammalian limbs are homologous to the teleost pectoral and pelvic fins. In this study we used Crispr/Cas9 to mutate the zebrafish met gene and found that the MMP derived musculature of the paired appendages was severely affected. The mutation resulted in a reduced muscle fibre number, in particular in the pectoral abductor, and in a disturbed pectoral fin function. Other MMP derived muscles, such as the sternohyoid muscle and posterior hypaxial muscle were also affected in met mutants. This indicates that the role of met in MMP function and appendicular myogenesis is conserved within vertebrates.

Place, publisher, year, edition, pages
Public Library of Science, 2019
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-163701 (URN)10.1371/journal.pone.0219259 (DOI)000482328300014 ()31287821 (PubMedID)2-s2.0-85069303028 (Scopus ID)
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2023-03-24Bibliographically approved
Aripaka, K., Gudey, S. K., Zang, G., Schmidt, A., Åhrling, S. S., Österman, L., . . . Landström, M. (2019). TRAF6 function as a novel co-regulator of Wnt3a target genes in prostate cancer. EBioMedicine, 45, 192-207
Open this publication in new window or tab >>TRAF6 function as a novel co-regulator of Wnt3a target genes in prostate cancer
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2019 (English)In: EBioMedicine, E-ISSN 2352-3964, Vol. 45, p. 192-207Article in journal (Refereed) Published
Abstract [en]

Background: Tumour necrosis factor receptor associated factor 6 (TRAF6) promotes inflammation in response to various cytokines. Aberrant Wnt3a signals promotes cancer progression through accumulation of β-Catenin. Here we investigated a potential role for TRAF6 in Wnt signaling.

Methods: TRAF6 expression was silenced by siRNA in human prostate cancer (PC3U) and human colorectal SW480 cells and by CRISPR/Cas9 in zebrafish. Several biochemical methods and analyses of mutant phenotype in zebrafish were used to analyse the function of TRAF6 in Wnt signaling.

Findings: Wnt3a-treatment promoted binding of TRAF6 to the Wnt co-receptors LRP5/LRP6 in PC3U and LNCaP cells in vitro. TRAF6 positively regulated mRNA expression of β-Catenin and subsequent activation of Wnt target genes in PC3U cells. Wnt3a-induced invasion of PC3U and SW480 cells were significantly reduced when TRAF6 was silenced by siRNA. Database analysis revealed a correlation between TRAF6 mRNA and Wnt target genes in patients with prostate cancer, and high expression of LRP5, TRAF6 and c-Myc correlated with poor prognosis. By using CRISPR/Cas9 to silence TRAF6 in zebrafish, we confirm TRAF6 as a key molecule in Wnt3a signaling for expression of Wnt target genes.

Interpretation: We identify TRAF6 as an important component in Wnt3a signaling to promote activation of Wnt target genes, a finding important for understanding mechanisms driving prostate cancer progression.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
beta-Catenin, LRP5, Prostate cancer, TRAF6, Wnt3a, Zebrafish
National Category
Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-161915 (URN)10.1016/j.ebiom.2019.06.046 (DOI)000475860000026 ()31262711 (PubMedID)2-s2.0-85067957867 (Scopus ID)
Available from: 2019-08-06 Created: 2019-08-06 Last updated: 2020-06-05Bibliographically approved
Dongre, M., Singh, B., Aung, K. M., Larsson, P., Miftakhova, R. R., Persson, K., . . . Wai, S. N. (2018). Flagella-mediated secretion of a novel Vibrio cholerae cytotoxin affecting both vertebrate and invertebrate hosts. Communications Biology, 1, Article ID 59.
Open this publication in new window or tab >>Flagella-mediated secretion of a novel Vibrio cholerae cytotoxin affecting both vertebrate and invertebrate hosts
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2018 (English)In: Communications Biology, E-ISSN 2399-3642, Vol. 1, article id 59Article in journal (Refereed) Published
Abstract [en]

Using Caenorhabditis elegans as an infection host model for Vibrio cholerae predator interactions, we discovered a bacterial cytotoxin, MakA, whose function as a virulence factor relies on secretion via the flagellum channel in a proton motive force-dependent manner. The MakA protein is expressed from the polycistronic makDCBA (motility-associated killing factor) operon. Bacteria expressing makDCBA induced dramatic changes in intestinal morphology leading to a defecation defect, starvation and death in C. elegans. The Mak proteins also promoted V. cholerae colonization of the zebrafish gut causing lethal infection. A structural model of purified MakA at 1.9 Å resolution indicated similarities to members of a superfamily of bacterial toxins with unknown biological roles. Our findings reveal an unrecognized role for V. cholerae flagella in cytotoxin export that may contribute both to environmental spread of the bacteria by promoting survival and proliferation in encounters with predators, and to pathophysiological effects during infections.

Place, publisher, year, edition, pages
Springer Nature Publishing AG, 2018
National Category
Microbiology in the medical area
Research subject
Infectious Diseases; Molecular Biology
Identifiers
urn:nbn:se:umu:diva-155563 (URN)10.1038/s42003-018-0065-z (DOI)000461126500059 ()30271941 (PubMedID)2-s2.0-85068116757 (Scopus ID)
Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2023-03-23Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-3730-1790

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