FENG Yujuan,WANG Le,HAN Guanghui,et al.Naoxin'an Capsule Alleviates Mitochondrial and Oxidative Damage in Chronic Cerebral Ischemia-induced VCI in Rats via Activating CREB/PGC-1α Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(23):19-29.
FENG Yujuan,WANG Le,HAN Guanghui,et al.Naoxin'an Capsule Alleviates Mitochondrial and Oxidative Damage in Chronic Cerebral Ischemia-induced VCI in Rats via Activating CREB/PGC-1α Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(23):19-29. DOI: 10.13422/j.cnki.syfjx.20221306.
Naoxin'an Capsule Alleviates Mitochondrial and Oxidative Damage in Chronic Cerebral Ischemia-induced VCI in Rats via Activating CREB/PGC-1α Pathway
To explore the effect of Naoxin'an capsule against mitochondrial dysfunction and oxidative damage in brains of rats with vascular cognitive impairment (VCI) induced by chronic cerebral ischemia.
Method
2
A total of 150 rats were randomized into modeling group (130 rats) and sham-operated group (20 rats) with the random number table method. The two-vessel occlusion (2-VO) was employed to induce VCI in rats, and finally 87 rats developed VCI. The VCI rats were classified into model group, positive drug group (Aricept, 0.5 mg·kg
-1
), and low-, medium- and high-dose Naoxin'an capsule groups (0.18, 0.36, 0.72 g·kg
-1
, separately), with 17-18 rats in each group. The administration lasted 8 weeks. The learning and working memory of VCI rats were assayed by novel object recognition test and Y-maze test. The 8-oxoguanine (8-OxoG) level was measured based on immunofluorescence staining. Spectrophotometry was performed to determine the activity of mitochondrial respiratory chain complexes Ⅰ, Ⅱ, Ⅲ, and Ⅳ, mitochondrial swelling, mitochondrial membrane potential (MMP), and activity of pyruvate dehydrogenase (PDH) and
α
-ketoglutarate dehydrogenase (KGDH). The submicroscopic structure of mitochondria was observed with electron microscope. The phosphorylation of cAMP response element-binding protein (CREB) and the expression of peroxisome proliferator-activated receptor
γ
coactivator-1
α
(PGC-1
α
), nuclear respiratory factor 1 (NRF-1), and mitochondrial transcription factor A (mt-TFA) were determined by Western blot. The mitochondrial status Ⅳ H
2
O
2
generation, activity of cerebral superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px), and malondialdehyde (MDA) content were measured with the photochemical method.
Result
2
Compared with the sham-operated group, model group showed decrease in new object discrimination index (
P
<
0.01) and spontaneous alternation rate in the Y-maze test (
P
<
0.01), increase in ROS production in the brain (
P
<
0.01), reduction in MMP and mitochondrial swelling A value (
P
<
0.01), obvious mitochondrial swelling, vacuoles and cristae fractures in mitochondria, decrease in the level of phosphorylated CREB, expression of PGC-1
α
, NRF-1 and mt-TFA (
P
<
0.01), and activity of the respiratory chain complexes Ⅰ, Ⅱ, Ⅲ, and Ⅳ (
P
<
0.01), PDH and KGDH in the brain (
P
<
0.01), rise of the production of H
2
O
2
at state IV (
P
<
0.01) and the content of MDA (
P
<
0.01), and reduction in the activity of SOD and GSH-Px (
P
<
0.01). Compared with the model group, each dose of Naoxin'an capsules can improve the new object discrimination index (
P
<
0.05,
P
<
0.01) and the rate of spontaneous alternation (
P
<
0.05,
P
<
0.01), decrease ROS production in the brain (
P
<
0.01), improve the MMP and swelling A value (
P
<
0.05,
P
<
0.01), alleviate mitochondrial swelling and mitochondrial submicroscopic damage, elevate the phosphorylated CREB level, the expression of PGC-1
α
, NRF-1 and mt-TFA (
P
<
0.05,
P
<
0.01), and the activity of mitochondrial respiratory chain complexes Ⅲ, and Ⅳ, PDH and KGDH (
P
<
0.01), decrease state Ⅳ H
2
O
2
generation (
P
<
0.01) and MDA content (
P
<
0.05,
P
<
0.01), and raise the activity of SOD and GSH-Px (
P
<
0.01).
Conclusion
2
By activating the CREB/PGC-1
α
pathway, Naoxin'an capsule can protect the structure and function of mitochondria, enhance the antioxidant capacity, and inhibit the mitochondrial dysfunction and oxidative damage induced by chronic cerebral ischemia, thus improving the VCI.
关键词
Keywords
references
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