Mesenchymal stem cell therapy improves spatial memory and hippocampal structure in aging rats.

Area of Science:

• Neuroscience
• Regenerative Medicine
• Stem Cell Biology

Background:

• Mesenchymal stem cells (MSCs) exhibit neurogenic and immunomodulatory properties, making them promising for brain regeneration.
• Aging is associated with cognitive decline, particularly in spatial memory, and alterations in hippocampal morphology and function.

Purpose of the Study:

• To evaluate the efficacy of intracerebroventricular (icv) administration of human bone marrow-derived MSCs (hBM-MSCs) in improving spatial memory and hippocampal morphology in senile rats.
• To assess the impact of hBM-MSCs on neurogenesis, microglial activation, and synaptic protein levels in the aging brain.

Main Methods:

• Senile (27-month-old) and young (3-month-old) female rats were used. Senile rats received icv injections of hBM-MSCs or saline (controls).
• Spatial memory was assessed using a modified Barnes maze test, including a probe trial for learning and retention evaluation.
• Immunohistochemistry was performed to quantify neuroblast (DCX) and microglial (Iba-1) markers. Hippocampal presynaptic protein expression was analyzed via immunoblotting.

Main Results:

• hBM-MSC treatment significantly improved spatial memory accuracy and retention in senile rats compared to controls.
• MSC treatment increased neuroblast numbers in the dentate gyrus and reduced reactive microglial cells.
• Presynaptic protein levels in the hippocampus were restored in the MSC-treated senile group.

Conclusions:

• Intracerebroventricularly delivered hBM-MSCs effectively enhance spatial memory in senile rats.
• This regenerative strategy ameliorates key functional and morphological brain changes associated with aging, including neurogenesis and neuroinflammation.