Nano-neurotoxicity bio-marker composition based on intracellular aggregates which are biomarkers of degenerative brain diseases

1. A method of assessing neurotoxicity of nanoparticles comprising:

preparing a tissue or cell sample of mammal;

treating the tissue or cell sample with the nanoparticles;

analyzing polyamine metabolites including putrescine, N1-acetylspermidine, N8-acetylspermidine, N1-acetylspermine and spermine in the sample;

comparing an amount of the polyamine metabolites with that of a control; and

determining the neurotoxicity of nanoparticles of the sample, if:

an amount of the putrescine is increased at least twice compared to the control not treated with the nanoparticles; and

an amount of the N1-acetylspermidine, the N8-acetylspermidine, the N1-acetylspermine and the spermine is decreased less than ½ times compared to the control not treated with the nanoparticles.

2. The method of assessing neurotoxicity of nanoparticles of claim 1 , further comprising:

analyzing at least one gene selected from the group consisting of ornithine decarboxylase 1 (ODC1), spermidine/spermine N1 acetyltransferase 1 (SAT1), polyamine oxidase (PAOX) and spermidine synthase 1 (SRM1) in the sample, wherein the at least one gene is involved in polyamine metabolism; and

comparing expression degree of the gene with that of a control.

3. The method of assessing neurotoxicity of nanoparticles of claim 2 ,

wherein the sample is exposed to the nanoparticles if an expression of the ODC1 gene, the SAT1 gene, the PAOX gene and the SRM1 gene is increased compared to the control not treated with the nanoparticles.

4. The method of assessing neurotoxicity of nanoparticles of claim 1 , wherein the nanoparticles are MNPs@SiO 2 (RITC) particles.