Abstract
To study a mechanism of phrenic nerve preservation phenomena during a photosensitization reaction, we investigated an uptake of talaporfin sodium and photosensitization reaction effect on an electric propagation. Right phrenic nerve was completely preserved after superior vena cava isolations using the photosensitization reaction in canine animal experiments, in spite of adjacent myocardium was electrically blocked. We predicted that low drug uptake and/or low photosensitization reaction effect on the nerve might be a mechanism of that phenomena. To investigate uptake to various nerve tissue, a healthy extracted crayfish ventral nerve cord and an extracted porcine phrenic nerve were immersed in 20 μg/ml talaporfin sodium solution for 0-240 min. The mean talaporfin sodium fluorescence brightness increased depending on the immersion time. This brightness saturated around the immersion time of 120 min. We found that talaporfin sodium uptake inside the perineurium which directly related to the electric propagation function was lower than that of outside in the porcine phrenic nerve. To investigate photosensitization reaction effect on electric propagation, the crayfish nerve was immersed into the same solution for 15 min and irradiated by a 663 nm laser light with 120 mW/cm2. Since we found the action potential disappeared when the irradiation time was 25-65 s, we consider that the crayfish nerve does not tolerant to the photosensitization reaction on electric propagation function at atmospheric pressure. From these results, we think that the low uptake of talaporfin sodium inside the perineurium and low oxygen partial pressure of nerve might be the possible mechanism to preserve phrenic nerve in vivo.
| Original language | English |
|---|---|
| Title of host publication | Optical Methods for Tumor Treatment and Detection |
| Subtitle of host publication | Mechanisms and Techniques in Photodynamic Therapy XXVII |
| Publisher | SPIE |
| Volume | 10476 |
| ISBN (Electronic) | 9781510614376 |
| DOIs | |
| Publication status | Published - 2018 Jan 1 |
| Event | Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXVII 2018 - San Francisco, United States Duration: 2018 Jan 27 → 2018 Jan 29 |
Other
| Other | Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXVII 2018 |
|---|---|
| Country | United States |
| City | San Francisco |
| Period | 18/1/27 → 18/1/29 |
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Keywords
- oxygen partial pressure
- photosensitization reaction
- phrenic nerve
- talaporfin sodium
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Atomic and Molecular Physics, and Optics
- Radiology Nuclear Medicine and imaging
Cite this
Mechanism to preserve phrenic nerve function during photosensitization reaction : Drug uptake and photosensitization reaction effect on electric propagation. / Takahashi, Haruka; Hamada, Risa; Ogawa, Emiyu; Arai, Tsunenori.
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXVII. Vol. 10476 SPIE, 2018. 1047610.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Mechanism to preserve phrenic nerve function during photosensitization reaction
T2 - Drug uptake and photosensitization reaction effect on electric propagation
AU - Takahashi, Haruka
AU - Hamada, Risa
AU - Ogawa, Emiyu
AU - Arai, Tsunenori
PY - 2018/1/1
Y1 - 2018/1/1
N2 - To study a mechanism of phrenic nerve preservation phenomena during a photosensitization reaction, we investigated an uptake of talaporfin sodium and photosensitization reaction effect on an electric propagation. Right phrenic nerve was completely preserved after superior vena cava isolations using the photosensitization reaction in canine animal experiments, in spite of adjacent myocardium was electrically blocked. We predicted that low drug uptake and/or low photosensitization reaction effect on the nerve might be a mechanism of that phenomena. To investigate uptake to various nerve tissue, a healthy extracted crayfish ventral nerve cord and an extracted porcine phrenic nerve were immersed in 20 μg/ml talaporfin sodium solution for 0-240 min. The mean talaporfin sodium fluorescence brightness increased depending on the immersion time. This brightness saturated around the immersion time of 120 min. We found that talaporfin sodium uptake inside the perineurium which directly related to the electric propagation function was lower than that of outside in the porcine phrenic nerve. To investigate photosensitization reaction effect on electric propagation, the crayfish nerve was immersed into the same solution for 15 min and irradiated by a 663 nm laser light with 120 mW/cm2. Since we found the action potential disappeared when the irradiation time was 25-65 s, we consider that the crayfish nerve does not tolerant to the photosensitization reaction on electric propagation function at atmospheric pressure. From these results, we think that the low uptake of talaporfin sodium inside the perineurium and low oxygen partial pressure of nerve might be the possible mechanism to preserve phrenic nerve in vivo.
AB - To study a mechanism of phrenic nerve preservation phenomena during a photosensitization reaction, we investigated an uptake of talaporfin sodium and photosensitization reaction effect on an electric propagation. Right phrenic nerve was completely preserved after superior vena cava isolations using the photosensitization reaction in canine animal experiments, in spite of adjacent myocardium was electrically blocked. We predicted that low drug uptake and/or low photosensitization reaction effect on the nerve might be a mechanism of that phenomena. To investigate uptake to various nerve tissue, a healthy extracted crayfish ventral nerve cord and an extracted porcine phrenic nerve were immersed in 20 μg/ml talaporfin sodium solution for 0-240 min. The mean talaporfin sodium fluorescence brightness increased depending on the immersion time. This brightness saturated around the immersion time of 120 min. We found that talaporfin sodium uptake inside the perineurium which directly related to the electric propagation function was lower than that of outside in the porcine phrenic nerve. To investigate photosensitization reaction effect on electric propagation, the crayfish nerve was immersed into the same solution for 15 min and irradiated by a 663 nm laser light with 120 mW/cm2. Since we found the action potential disappeared when the irradiation time was 25-65 s, we consider that the crayfish nerve does not tolerant to the photosensitization reaction on electric propagation function at atmospheric pressure. From these results, we think that the low uptake of talaporfin sodium inside the perineurium and low oxygen partial pressure of nerve might be the possible mechanism to preserve phrenic nerve in vivo.
KW - oxygen partial pressure
KW - photosensitization reaction
KW - phrenic nerve
KW - talaporfin sodium
UR - http://www.scopus.com/inward/record.url?scp=85046251583&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85046251583&partnerID=8YFLogxK
U2 - 10.1117/12.2289200
DO - 10.1117/12.2289200
M3 - Conference contribution
AN - SCOPUS:85046251583
VL - 10476
BT - Optical Methods for Tumor Treatment and Detection
PB - SPIE
ER -