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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Galectin-1 Improves Sarcolemma Repair and Decreases the Inflammatory Response in LGMD2B Models

Rathgeber, Matthew F. 08 December 2020 (has links)
Limb-girdle muscular dystrophy type 2B (LGMD2B) is caused by mutations in the dysferlin gene, resulting in non-functional dysferlin, a key protein found in muscle membrane. Treatment options available for patients are chiefly palliative in nature and focus on maintaining ambulation. Our hypothesis is that galectin-1 (Gal-1), a soluble carbohydrate binding protein, increases membrane repair capacity, myogenic potential, M2 macrophage polarization and decreases NF-κB inflammation in dysferlin-deficient models. To test this hypothesis, we used recombinant human galectin-1 (rHsGal-1) to treat dysferlin-deficient models. We show that rHsGal-1 treatments of 48 h-72 h promotes myogenic maturation as indicated through improvements in size, myotube alignment, and myoblast migration in dysferlin-deficient myotubes. Furthermore, rHsGal-1 showed an increased membrane repair capacity of dysferlin-deficient myotubes. Improvements in membrane repair after only a 10 min rHsGal-1treatment suggests mechanical stabilization of the membrane due to interaction with glycosylated membrane bound, ECM or yet to be identified ligands through the CDR domain of Gal-1. rHsGal-l significantly reduces canonical NF-κB inflammation through TAK 1, P65, P50. Lastly we find 2.7 mg/kg in vivo rHsGal-1 treatment in BLA/J mice supports an M2 cyto-regenerative macrophage populations. Together our novel results reveal Gal-1 remediates disease pathologies in LGMD2B through changes in integral myogenic protein expression, mechanical membrane stabilization, immune modulation, and reducing canonical NF-κB inflammation.

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