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Piperine increases striatal levels of DA and TH and decreases α-syn and Aβ42 deposition in PDD mice by regulting autophagy: downexpression Beclin-1 and LC3B and upexpression p62
Applied Biological Chemistry ( IF 2.3 ) Pub Date : 2022-06-26 , DOI: 10.1186/s13765-022-00710-0
Liping Huang , Xiaoqin Zhong , Zhongliu Zhou , Yuanliang Cai , Minzhen Deng

Piperine, the major pharmacological ingredient of pepper, can delay the procession of neuropharmacological effects, but its effects and mechanisms on Parkinson's disease dementia (PDD) mice is still unclear, we investigated whether piperine could help treating PDD mice. Here, PDD mice were randomly divided into eight groups (n = 12/group): a normal control group, a PDD model group, a madopar group, an autophagy inhibitor group, an autophagy activator group, and groups receiving low, medium or high doses of piperine respectively. The normal control and PDD model mice were injected with saline. Treatments were administered to the mice once per day continuously for 30 days. The behavioral tests were assessed. Dopamine (DA), Monoamine Oxidase-B (MAO-B), DOPA decarboxylase (DDC), β-secretase, acetylcholinesterase (AChE), amyloid β42 (Aβ42), tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) levels were detected. α-synuclein (α-syn), tyrosine hydroxylase (TH), HSP90, Beclin-1, LC3B, p62 mRNA levels and miRNA-99a-5p expression were determined. Neuronal histology was observed. The behavior of PDD mice improved significantly after peperine treatment compared with the PDD model mice. In addition, our results also showed that peperine treatment increased DA, TH, DDC and p62 levels, decreased MAOB, β-secretase, AChE, Aβ42, TNF-α, IL-6, Beclin-1 and LC3B levels, and down-regulated α-syn, HSP90, Beclin-1, LC3B mRNA levels and miR-99a-5p expression. These findings suggest that piperine may reduce the expression of mmu-miR-99a-5p and autophagy-related factors (HSP90, Beclin-1, LC3B and p62) to alleviate the neurological impairment of PDD mice, which is shown to slow down the process of DA metabolism and Aβ production and resist neuroinflammation.

中文翻译:

胡椒碱通过调节自噬来增加 DA 和 TH 的纹状体水平并减少 PDD 小鼠的 α-syn 和 Aβ42 沉积:下调 Beclin-1 和 LC3B 的表达和上调 p62,胡椒碱通过调节自噬来增加 DA 和 TH 的纹状体水平并减少 PDD 小鼠的 α-syn 和 Aβ42 沉积:下调 Beclin-1 和 LC3B 的表达和上调 p62

胡椒的主要药理成分胡椒碱可以延缓神经药理作用的进程,但其对帕金森病痴呆(PDD)小鼠的作用和机制尚不清楚,我们研究了胡椒碱是否有助于治疗PDD小鼠。在这里,PDD 小鼠被随机分为 8 组(n = 12/组):正常对照组、PDD 模型组、madopar 组、自噬抑制剂组、自噬激活剂组以及接受低、中或高剂量组剂量的胡椒碱。正常对照和PDD模型小鼠注射生理盐水。每天对小鼠进行一次治疗,持续30天。对行为测试进行了评估。多巴胺 (DA)、单胺氧化酶-B (MAO-B)、多巴脱羧酶 (DDC)、β-分泌酶、乙酰胆碱酯酶 (AChE)、淀粉样蛋白 β42 (Aβ42)、检测肿瘤坏死因子-α(TNF-α)和白细胞介素-6(IL-6)水平。测定了 α-突触核蛋白 (α-syn)、酪氨酸羟化酶 (TH)、HSP90、Beclin-1、LC3B、p62 mRNA 水平和 miRNA-99a-5p 表达。观察到神经元组织学。与PDD模型小鼠相比,peperine治疗后PDD小鼠的行为显着改善。此外,我们的研究结果还表明,胡椒碱处理增加了 DA、TH、DDC 和 p62 水平,降低了 MAOB、β-分泌酶、AChE、Aβ42、TNF-α、IL-6、Beclin-1 和 LC3B 水平,并下调了α-syn、HSP90、Beclin-1、LC3B mRNA 水平和 miR-99a-5p 表达。这些发现表明,胡椒碱可能降低 mmu-miR-99a-5p 和自噬相关因子(HSP90、Beclin-1、LC3B 和 p62)的表达,从而减轻 PDD 小鼠的神经损伤,,胡椒的主要药理成分胡椒碱可以延缓神经药理作用的进程,但其对帕金森病痴呆(PDD)小鼠的作用和机制尚不清楚,我们研究了胡椒碱是否有助于治疗PDD小鼠。在这里,PDD 小鼠被随机分为 8 组(n = 12/组):正常对照组、PDD 模型组、madopar 组、自噬抑制剂组、自噬激活剂组以及接受低、中或高剂量组剂量的胡椒碱。正常对照和PDD模型小鼠注射生理盐水。每天对小鼠进行一次治疗,持续30天。对行为测试进行了评估。多巴胺 (DA)、单胺氧化酶-B (MAO-B)、多巴脱羧酶 (DDC)、β-分泌酶、乙酰胆碱酯酶 (AChE)、淀粉样蛋白 β42 (Aβ42)、检测肿瘤坏死因子-α(TNF-α)和白细胞介素-6(IL-6)水平。测定了 α-突触核蛋白 (α-syn)、酪氨酸羟化酶 (TH)、HSP90、Beclin-1、LC3B、p62 mRNA 水平和 miRNA-99a-5p 表达。观察到神经元组织学。与PDD模型小鼠相比,peperine治疗后PDD小鼠的行为显着改善。此外,我们的研究结果还表明,胡椒碱处理增加了 DA、TH、DDC 和 p62 水平,降低了 MAOB、β-分泌酶、AChE、Aβ42、TNF-α、IL-6、Beclin-1 和 LC3B 水平,并下调了α-syn、HSP90、Beclin-1、LC3B mRNA 水平和 miR-99a-5p 表达。这些发现表明,胡椒碱可能降低 mmu-miR-99a-5p 和自噬相关因子(HSP90、Beclin-1、LC3B 和 p62)的表达,从而减轻 PDD 小鼠的神经损伤,
更新日期:2022-06-27
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