Neurogenesis upregulation on the healthy hemisphere after stroke enhances compensation for age-dependent decrease of...

Area of Science:

• Neuroscience
• Regenerative Medicine

Background:

• Stroke is a major cause of death and disability globally, with limited chronic phase treatments.
• Endogenous repair mechanisms, including neurogenesis, influence stroke outcomes.
• Age-related decline in neurogenesis may impair recovery from cerebral diseases.

Purpose of the Study:

• To characterize age-dependent neurogenic responses to stroke.
• To investigate the therapeutic potential of endogenous neurogenesis in stroke recovery, particularly in aging brains.

Main Methods:

• Utilized the DCX-Luc transgenic mouse model for noninvasive monitoring of neurogenesis via optical imaging.
• Assessed stroke lesions using quantitative MRI.
• Compared neurogenic responses in three age groups (2, 6, 12 months) over three weeks post-stroke.

Main Results:

• Observed an age-dependent decrease in basal neurogenesis.
• Stroke induced a significant upregulation of neurogenesis peaking at 4 days post-stroke.
• Older animals exhibited enhanced neurogenic response to stroke, compensating for reduced basal levels.
• Additional neurogenesis upregulation occurred in the healthy hemisphere of middle-aged and older mice.

Conclusions:

• Endogenous neurogenesis plays a crucial role in stroke recovery, especially in older individuals.
• Aging brains demonstrate an increased capacity to respond to cerebral lesions through enhanced neurogenesis.
• Findings support the therapeutic relevance of promoting neurogenesis for stroke treatment.