The role of iron and copper molecules in the neuronal vulnerability of locus coeruleus and substantia nigra during aging.
In this study, a comparative analysis of metal-related neuronal vulnerability was performed in two brainstem nuclei, the locus coeruleus (LC) and substantia nigra (SN), known targets of the etiological noxae in Parkinson's disease and related disorders. LC and SN pars compacta neurons both degenerate in Parkinson's disease and other Parkinsonisms; however, LC neurons are comparatively less affected and with a variable degree of involvement. In this study, iron, copper, and their major molecular forms like ferritins, ceruloplasmin, neuromelanin (NM), manganese-superoxide dismutase (SOD), and copper/zinc-SOD were measured in LC and SN of normal subjects at different ages. Iron content in LC was much lower than that in SN, and the ratio heavy-chain ferritin/iron in LC was higher than in the SN. The NM concentration was similar in LC and SN, but the iron content in NM of LC was much lower than SN. In both regions, heavy- and light-chain ferritins were present only in glia and were not detectable in neurons. These data suggest that in LC neurons, the iron mobilization and toxicity is lower than that in SN and is efficiently buffered by NM. The bigger damage occurring in SN could be related to the higher content of iron. Ferritins accomplish the same function of buffering iron in glial cells. Ceruloplasmin levels were similar in LC and SN, but copper was higher in LC. However, the copper content in NM of LC was higher than that of SN, indicating a higher copper mobilization in LC neurons. Manganese-SOD and copper/zinc-SOD had similar age trend in LC and SN. These results may explain at least one of the reasons underlying lower vulnerability of LC compared to SN in Parkinsonian syndromes.
Zecca
Luigi
L
Institute of Biomedical Technologies, Italian National Research Council, 20090 Segrate, Italy. luigi.zecca@itb.cnr.it
Stroppolo
Antonella
A
Gatti
Alberto
A
Tampellini
Davide
D
Toscani
Marco
M
Gallorini
Mario
M
Giaveri
Giuseppe
G
Arosio
Paolo
P
Santambrogio
Paolo
P
Fariello
Ruggero G
RG
Karatekin
Erdem
E
Kleinman
Mark H
MH
Turro
Nicholas
N
Hornykiewicz
Oleh
O
Zucca
Fabio A
FA
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D002570:Ceruloplasmin / Q000378:metabolism; D003300:Copper / Q000378:metabolism*; D004578:Electron Spin Resonance Spectroscopy; D005260:Female; D005293:Ferritins / Q000378:metabolism; D006706:Homeostasis; D006801:Humans; D007501:Iron / Q000378:metabolism*; D007502:Iron Chelating Agents / Q000378:metabolism; D008125:Locus Coeruleus / Q000166:cytology / Q000378:metabolism*; D008297:Male; D008543:Melanins / Q000378:metabolism; D008875:Middle Aged; D009457:Neuroglia / Q000378:metabolism; D009474:Neurons / Q000378:metabolism*; D013378:Substantia Nigra / Q000166:cytology / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism
D007502:Iron Chelating Agents; D008543:Melanins; C014121:neuromelanin; D003300:Copper; D005293:Ferritins; D007501:Iron; D013482:Superoxide Dismutase; D002570:Ceruloplasmin