Related Experiment Videos
Neuroprotective effect of the iron chelator desferrioxamine against MPP+ toxicity on striatal dopaminergic terminals
M Santiago1, E R Matarredona, L Granero
1Departamento de Bioquímica, Bromatología y Toxicología, Facultad de Farmacia, Universidad de Sevilla, Spain.
Abstract:
Microdialysis was used to evaluate the effect of desferrioxamine (DES) against 1-methyl-4-phenylpyridinium (MPP+) toxicity. The presence of DES (40 fmol-40 nmol/15 min for a total of 90 min) in the Ringer solution, coperfused with MPP+ (40 nmol/15 min) on day 1, produced on day 2 a higher extracellular dopamine output after perfusion of MPP+ than in control MPP+ perfusion experiments, in which no DES was administered on day 1. Both Ringer perfusion alone (control Ringer) and coperfusion of 40 nmol DES with 40 nmol MPP+ on day 1 produced on day 2 similar increases in extracellular dopamine output after a second MPP+ perfusion. In the control Ringer experiment, note that the MPP+ on day 2 is the first MPP+ perfusion. Perfusion of 800 fmol FeCl3/15 min along with 40 nmol MPP+ and 400 fmol DES on day 1 completely abolished on day 2 the neuroprotective effect found with 40 nmol MPP+ and 400 fmol DES; 800 fmol FeCl3 did not increase the neurotoxic effect of 40 nmol MPP+ perfusion. The ability of DES to protect against MPP+ toxicity may indicate a therapeutic strategy in the treatment of diseases when iron is implicated.
Insights
Desferrioxamine (DES) protects against 1-methyl-4-phenylpyridinium (MPP+) neurotoxicity by increasing dopamine output. Iron (FeCl3) addition abolished this neuroprotective effect, suggesting DES as a therapeutic strategy for iron-related diseases.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- 1-methyl-4-phenylpyridinium (MPP+) is a neurotoxin that causes dopaminergic neuron damage.
- Iron dysregulation is implicated in neurodegenerative diseases.
- Desferrioxamine (DES) is an iron chelator with potential neuroprotective properties.
Purpose of the Study:
- To evaluate the neuroprotective effect of desferrioxamine (DES) against MPP+ induced toxicity.
- To investigate the role of iron in mediating MPP+ toxicity and DES's neuroprotection.
Main Methods:
- Microdialysis was employed to measure extracellular dopamine levels in vivo.
- Experimental groups received varying concentrations of DES and MPP+ with or without FeCl3.
- Neuroprotection was assessed by measuring dopamine output after subsequent MPP+ challenge.
Main Results:
- DES treatment significantly increased extracellular dopamine output following MPP+ challenge, indicating neuroprotection.
- Co-perfusion with iron (FeCl3) abolished the neuroprotective effect of DES against MPP+ toxicity.
- FeCl3 alone did not exacerbate MPP+ neurotoxicity.
Conclusions:
- Desferrioxamine demonstrates significant neuroprotective effects against MPP+ toxicity.
- Iron appears to play a critical role in mediating MPP+ neurotoxicity and counteracting DES's protective effects.
- DES holds therapeutic potential for neurodegenerative conditions associated with iron dysregulation.