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Assessing the axonal translocation of CeO2 and SiO2 nanoparticles in the sciatic nerve fibers of the frog: an ex vivo electrophysiological study.

Kastrinaki G, Samsouris C, Kosmidis EK, Papaioannou E, Konstandopoulos AG, Theophilidis G - Int J Nanomedicine (2015)

Bottom Line: For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity.The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate.Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

View Article: PubMed Central - PubMed

Affiliation: Aerosol and Particle Technology Laboratory (APTL), CERTH/CPERI, Thessaloniki, Greece.

ABSTRACT
The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is investigated. The study was conducted on frog sciatic nerve fibers in an ex vivo preparation. Nanoparticles were applied at the proximal end of the excised nerve. A nerve stimulation protocol was followed for over 35 hours. Nerve vitality curve comparison between control and exposed nerves showed that CeO2 has no neurotoxic effect at the concentrations tested. After exposure, specimens were fixed and then screen scanned every 1 mm along their length for nanoparticle presence by means of Fourier transform infrared microscopy. We demonstrated that both nanoparticles translocate within the nerve by formation of narrow bands in the Fourier transform infrared spectrum. For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity. The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate. Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

No MeSH data available.


Related in: MedlinePlus

FTIR traces from different regions of CeO2-treated sciatic nerve of the frog.Notes: Arrows indicate CeO2 presence compared to control (CeO2 NP). Peaks approximately 1,640 cm−1 are attributed to the ν2′ band of the hydrogen bond of water.Abbreviations: FTIR, Fourier transform infrared microscopy; NP, nanoparticle.
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f3-ijn-10-7089: FTIR traces from different regions of CeO2-treated sciatic nerve of the frog.Notes: Arrows indicate CeO2 presence compared to control (CeO2 NP). Peaks approximately 1,640 cm−1 are attributed to the ν2′ band of the hydrogen bond of water.Abbreviations: FTIR, Fourier transform infrared microscopy; NP, nanoparticle.

Mentions: Another less typical set of recordings is demonstrated in Figure 3, where it seems that NPs reached the beginning of the distal region (1–2 m, according to Figure 1B), far from their usual position at the 15–20 mm region of the middle part, while a bundle of NPs is also located at the far distal part (at 4–5 mm).


Assessing the axonal translocation of CeO2 and SiO2 nanoparticles in the sciatic nerve fibers of the frog: an ex vivo electrophysiological study.

Kastrinaki G, Samsouris C, Kosmidis EK, Papaioannou E, Konstandopoulos AG, Theophilidis G - Int J Nanomedicine (2015)

FTIR traces from different regions of CeO2-treated sciatic nerve of the frog.Notes: Arrows indicate CeO2 presence compared to control (CeO2 NP). Peaks approximately 1,640 cm−1 are attributed to the ν2′ band of the hydrogen bond of water.Abbreviations: FTIR, Fourier transform infrared microscopy; NP, nanoparticle.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664516&req=5

f3-ijn-10-7089: FTIR traces from different regions of CeO2-treated sciatic nerve of the frog.Notes: Arrows indicate CeO2 presence compared to control (CeO2 NP). Peaks approximately 1,640 cm−1 are attributed to the ν2′ band of the hydrogen bond of water.Abbreviations: FTIR, Fourier transform infrared microscopy; NP, nanoparticle.
Mentions: Another less typical set of recordings is demonstrated in Figure 3, where it seems that NPs reached the beginning of the distal region (1–2 m, according to Figure 1B), far from their usual position at the 15–20 mm region of the middle part, while a bundle of NPs is also located at the far distal part (at 4–5 mm).

Bottom Line: For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity.The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate.Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

View Article: PubMed Central - PubMed

Affiliation: Aerosol and Particle Technology Laboratory (APTL), CERTH/CPERI, Thessaloniki, Greece.

ABSTRACT
The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is investigated. The study was conducted on frog sciatic nerve fibers in an ex vivo preparation. Nanoparticles were applied at the proximal end of the excised nerve. A nerve stimulation protocol was followed for over 35 hours. Nerve vitality curve comparison between control and exposed nerves showed that CeO2 has no neurotoxic effect at the concentrations tested. After exposure, specimens were fixed and then screen scanned every 1 mm along their length for nanoparticle presence by means of Fourier transform infrared microscopy. We demonstrated that both nanoparticles translocate within the nerve by formation of narrow bands in the Fourier transform infrared spectrum. For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity. The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate. Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

No MeSH data available.


Related in: MedlinePlus