MicroRNA-195-5p Inhibits Intracerebral Hemorrhage-Induced Inflammatory Response and Neuron Cell Apoptosis.

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Intracerebral hemorrhage (ICH) causes severe brain injury through primary mechanical damage and secondary injury mechanisms like inflammation and oxidative stress.
• MicroRNA-195-5p (miR-195-5p) is implicated in regulating processes relevant to ICH pathology, including cell proliferation, oxidative stress, and inflammation.

Purpose of the Study:

• To evaluate the therapeutic potential of miR-195-5p in mitigating secondary brain injury following ICH.
• To investigate the molecular mechanisms underlying the neuroprotective effects of miR-195-5p in an ICH rat model.

Main Methods:

• Intracerebral hemorrhage (ICH) was induced in Sprague-Dawley rats using collagenase injection.
• miR-195-5p was administered intravenously, and neurological function was assessed via behavioral tests.
• Protein expression, macrophage polarization, oxidative stress markers, inflammatory signaling pathways, apoptosis, and synaptic plasticity markers were analyzed using Western blotting and ELISA.

Main Results:

• miR-195-5p treatment significantly improved neurological function and behavioral recovery.
• It modulated macrophage polarization towards an anti-inflammatory phenotype, reduced oxidative stress (increased Sirt1, Nrf2), and attenuated inflammation (decreased NF-κB).
• miR-195-5p inhibited apoptosis (increased Bcl-2, decreased cleaved caspase-3) and restored synaptic plasticity (modulated NMDARs, BDNF, TrkB, ERK, CREB).

Conclusions:

• miR-195-5p exerts significant neuroprotective effects in ICH models by combating secondary injury mechanisms.
• The microRNA reduces inflammation, oxidative stress, and apoptosis while promoting synaptic plasticity, leading to improved neurological outcomes.
• miR-195-5p represents a promising therapeutic candidate for intracerebral hemorrhage, meriting further clinical investigation.