Quantitative proteomics revealed extensive microenvironmental changes after stem cell transplantation in ischemic...

Area of Science:

• Neuroscience
• Regenerative Medicine
• Biochemistry

Background:

• Stem cell therapy is crucial for ischemic stroke, but long-term microenvironmental changes are poorly understood.
• Most studies focus on the acute phase, leaving subacute and chronic phases under-researched.

Purpose of the Study:

• To investigate microenvironmental changes in subacute and chronic ischemic stroke phases post-stem cell transplantation.
• To compare the therapeutic effects of induced pluripotent stem cells (iPSCs) and neural stem cells (NSCs).

Main Methods:

• Middle cerebral artery occlusion model in rats.
• Transplantation of iPSCs and NSCs.
• Positron emission tomography imaging, neurological tests, and quantitative proteomics.

Main Results:

• iPSC transplantation led to increased glucose metabolism and improved neurofunctional scores compared to NSC transplantation.
• Proteomics identified 39 differentially expressed proteins in iPSC-transplanted brains during subacute and chronic phases.
• These proteins are involved in neuronal survival, axonal remodeling, antioxidant defense, and mitochondrial function.

Conclusions:

• iPSCs demonstrate a positive therapeutic effect in treating ischemic stroke.
• Significant microenvironmental adaptations occur in the subacute and chronic phases following stem cell therapy.