Parkin- and PINK1-dependent mitophagy in neurons: will the real pathway please stand up?

被引:101
|
作者
Grenier, Karl [1 ]
McLelland, Gian-Luca [1 ]
Fon, Edward A. [1 ]
机构
[1] McGill Univ, Montreal Neurol Inst, Dept Neurol & Neurosurg, McGill Parkinson Program, Montreal, PQ H3A 2B4, Canada
来源
FRONTIERS IN NEUROLOGY | 2013年 / 4卷
关键词
autophagy; Mitochondria; mitophagy; neurons; parkin; Parkinson's disease; PINK1; DIFFERENTIATION-ASSOCIATED PROTEIN-1; MITOCHONDRIAL-DNA DELETIONS; DAMAGED MITOCHONDRIA; QUALITY-CONTROL; NITRIC-OXIDE; EARLY-ONSET; PINK1; DISEASE; DEGRADATION; AUTOPHAGY;
D O I
10.3389/fneur.2013.00100
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Parkinson's disease (PD) is characterized by massive degeneration of dopaminergic neurons in the substantia nigra. Whereas the majority of PD cases are sporadic, about 5-10% of cases are familial and associated with genetic factors. The loss of parkin or PINK1, two such factors, leads to an early onset form of PD. Importantly, recent studies have shown that parkin functions downstream of PINK1 in a common genetic pathway affecting mitochondrial homeostasis. More precisely, parkin has been shown to mediate the autophagy of damaged mitochondria (mitophagy) in a PINK1-dependent manner. However, much of the work characterizing this pathway has been carried out in immortalized cell lines overexpressing high levels of parkin. In contrast, whether or how endogenous parkin and PINK1 contribute to mitophagy in neurons is much less clear. Here we review recent work addressing the role of parkin/PINK1-dependent mitophagy in neurons. Clearly, it appears that mitophagy pathways differ spatially and kinetically in neurons and immortalized cells, and therefore might diverge in their ultimate outcome and function. While evidence suggests that parkin can translocate to mitochondria in neurons, the function and mechanism of mitophagy downstream of parkin recruitment in neurons remains to be clarified. Moreover, it is noteworthy that most work has focused on the downstream signaling events in parkin/PINK1 mitophagy, whereas the upstream signaling pathways remain comparatively poorly characterized. Identifying the upstream signaling mechanisms that trigger parkin/PINK1 mitophagy will help to explain the nature of the insults affecting mitochondrial function in PD, and a better understanding of these pathways in neurons will be the key in identifying new therapeutic targets in PD.
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页数:8
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