The Effect of The Notch Signalling Pathway Inhibition on The Osteogenic Differentiation of Pluripotent Stem Cells

Simple item page
dc.contributor.advisorRancourt, Derrick Emile
dc.contributor.authorHelmi, Summer Ahmed Mahmoud
dc.contributor.committeememberJamniczky, Heather
dc.contributor.committeememberKurrasch, Deborah
dc.contributor.committeememberWang, Lisheng
dc.contributor.committeememberCobb, John
dc.date2022-06
dc.date.accessioned2022-05-04T17:12:17Z
dc.date.available2022-05-04T17:12:17Z
dc.date.issued2022-04
dc.description.abstractCritical size bone defects are a common problem in orthopedics; a critical-size bone defect is a defect larger than 1.5 times the diameter of the injured bone. The most common causes of critical size bone defects are trauma, tumor excision, and infection. The treatment options for critical-size bone defects are very challenging, primarily with underlying chronic conditions like osteoporosis and diabetes. Bone is a dynamic and highly specialized connective tissue due to its unique regeneration capability. However, if the bone defect is large, it would require grafting to heal properly as this defect will not heal by itself if left untreated. Induced Pluripotent stem cell-based cell therapies for bone regeneration involve reprogramming a patient’s cells into iPSC and re-directing them to differentiate into the osteoblast lineage, then culturing them onto a scaffolding system that provides structural and functional support to the differentiated cells. Appropriate scaffolds and the careful use of bioactive molecules to enhance the differentiation outcome are vital components for successful iPSC-based tissue engineering. These combinations considerably impact bone cell-material interactions that guide bone regeneration and improve bone healing and regeneration processes. The Notch signalling pathway is highly conserved in cell fate determination throughout the animal kingdom and plays a role in the terminal differentiation in various tissues. The Notch signalling pathway was proven to enhance self-renewal and inhibit differentiation of bone progenitors. In the first part of this thesis, we explored the effect of inhibiting the Notch signalling pathway on mouse pluripotent stem cells. The results showed that inhibiting the Notch signalling pathway enhanced the differentiation of mouse pluripotent stem cells to osteoblasts. Moving forward, in the second part of the thesis, we explored if inhibiting the Notch signalling pathway in human pluripotent stem cells will have a similar advancement in the differentiation to bone cells. The results showed significant improvement in the osteogenic differentiation outcome compared to control cultures. In the third part, we tested the effect of Notch inhibition on the osteogenic differentiation of human induced pluripotent stem cells in vivo in an ectopic bone formation model. Collagen scaffolds mixed with DAPT Notch inhibitor guided and enhanced the osteogenic differentiation of human iPSC to tumor-free bone tissue. This approach can significantly accelerate the bone generation and healing of critical-size bone defects in normal patients and patients with underlying debilitating conditions.en_US
dc.identifier.citationHelmi, S. A. M. (2022). The effect of the Notch signalling pathway inhibition on the osteogenic differentiation of pluripotent stem cells (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/39732
dc.identifier.urihttp://hdl.handle.net/1880/114612
dc.language.isoengen_US
dc.publisher.facultyCumming School of Medicineen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectStem Cellsen_US
dc.subjectNotch signallingen_US
dc.subjectCell signallingen_US
dc.subjectBone regenerationen_US
dc.subjectCell transplantsen_US
dc.subjectiPSCen_US
dc.subjectCellular reprogrammingen_US
dc.subject.classificationBiology--Cellen_US
dc.subject.classificationBiology--Molecularen_US
dc.titleThe Effect of The Notch Signalling Pathway Inhibition on The Osteogenic Differentiation of Pluripotent Stem Cellsen_US
dc.typedoctoral thesisen_US
thesis.degree.disciplineMedicine – Biochemistry and Molecular Biologyen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameDoctor of Philosophy (PhD)en_US
ucalgary.item.requestcopyfalseen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
ucalgary_2022_helmi_summer.pdf
Size:
5.75 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.62 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Open Theses and Dissertations