Deletion of Herpud1 Enhances Heme Oxygenase-1 Expression in a Mouse Model of Parkinson’s Disease

الملخص EN

Herp is an endoplasmic reticulum- (ER-) resident membrane protein that plays a role in ER-associated degradation.

We studied the expression of Herp and its effect on neurodegeneration in a mouse model of Parkinson’s disease (PD), in which both the oxidative stress and the ER stress are evoked.

Eight hours after administering a PD-related neurotoxin, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), to mice, the expression of Herp increased at both the mRNA and the protein levels.

Experiments using Herpud1 +/+ and Herpud1 −/− mice revealed that the status of acute degeneration of nigrostriatal neurons and reactive astrogliosis was comparable between two genotypes after MPTP injection.

However, the expression of a potent antioxidant, heme oxygenase-1 (HO-1), was detected to a higher degree in the astrocytes of Herpud1 −/− mice than in the astrocytes of Herpud1 +/+ mice 24 h after MPTP administration.

Further experiments using cultured astrocytes revealed that the stress response against MPP+, an active form of MPTP, and hydrogen peroxide, both of which cause oxidative stress, was comparable between the two genotypes.

These results suggest that deletion of Herpud1 may cause a slightly higher level of initial damage in the nigrastrial neurons after MPTP administration but is compensated for by higher induction of antioxidants such as HO-1 in astrocytes.