Abstract
Intractable neuropathic pain following spinal cord injury (NP-SCI) reduces a patient’s quality of life. Excessive release of ATP into the extracellular space evokes neuroinflammation via purinergic receptor. Neuroinflammation plays an important role in the initiation and maintenance of NP. However, little is known about whether or not extracellular ATP cause NP-SCI. We found in the present study that excess of intracellular ATP at the lesion site evokes at-level NP-SCI. No significant differences in the body weight, locomotor function, or motor behaviors were found in groups that were negative and positive for at-level allodynia. The intracellular ATP level at the lesion site was significantly higher in the allodynia-positive mice than in the allodynia-negative mice. A metabolome analysis revealed that there were no significant differences in the ATP production or degradation between allodynia-negative and allodynia-positive mice. Dorsal horn neurons in allodynia mice were found to be inactivated in the resting state, suggesting that decreased ATP consumption due to neural inactivity leads to a build-up of intracellular ATP. In contrast to the findings in the resting state, mechanical stimulation increased the neural activity of dorsal horn and extracellular ATP release at lesion site. The forced production of intracellular ATP at the lesion site in non-allodynia mice induced allodynia. The inhibition of P2X4 receptors in allodynia mice reduced allodynia. These results suggest that an excess buildup of intracellular ATP in the resting state causes at-level NP-SCI as a result of the extracellular release of ATP with mechanical stimulation.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AKT:
-
Protein kinase B
- BDNF:
-
Brain-derived neurotrophic factor
- FRET:
-
Förster resonance energy transfer
- GABA:
-
Gamma-amino-butyric-acid
- JNK:
-
C-Jun N-terminal kinase
- KCC2:
-
K+–Cl− cotransporter 2
- MAPK:
-
Mitogen-activated protein kinase
- MRI:
-
Magnetic resonance imaging
- NLRP:
-
NOD-, LRR- and pyrin domain-containing protein
- NMDA:
-
N-methyl-D-aspartate
- NP:
-
Neuropathic pain
- P2X4:
-
P2X prinoreceptor 4
- SCI:
-
Spinal cord injury
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Acknowledgements
We thank Japan Medical Communications for the English-language proofreading. We also thank Y. Furuno and N. Saeki for supporting the experiments. This paper is dedicated to the memory of Dr. Hirofumi Sugano, who passed away on April 1, 2019.
Funding
This study was supported by JSPS KAKENHI Grant Number JP19K09527, JP22K09248, AMED/Research Project on Elucidation of Chronic Pain Grant Number JP20ek0610017.
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Supplementary file1 Fig. S1. Characterization of allodynia at the injury-level segment in SCI. (A–G) The positive response rate at the injury-level segment at each stimulation strength in the sham and 25 and 50 kdyn SCI groups. Sham, n=6; 25 kdyn, n=9; 50 kdyn, n=7. Error bars represent the mean±SD. (TIF 1096 kb)
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Supplementary file2 Fig. S2. Characterization of allodynia below the injury-site level in SCI. (A–G) The positive response rate below the injury level at each stimulation strength in the sham and 25 and 50 kdyn SCI groups. Sham, n=6; 25 kdyn, n=9; 50 kdyn, n=7. Error bars represent the mean±SD. (TIF 1081 kb)
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Supplementary file3 Fig. S3. Intracellular ATP at the injury site at three weeks after SCI. (A) The motor behavior in allodynia-negative and allodynia-positive mice. Sham, n=5; allodynia-negative, n=5; allodynia-positive, n=5. (B) Representative intracellular ATP images at 3 weeks after SCI. The maximum OFP/GFP value at 3.0 and the minimum value at 1.0. The right and left panels show the allodynia-negative and allodynia-positive groups, respectively. There was no significant difference between the allodynia-negative and allodynia-positive groups (p=0.137). Allodynia-negative, n=3; Allodynia-positive n=3. (C) A metabolomics analysis was conducted for the spinal cord segment at the injury site at three weeks after SCI. ATP, ADP, AMP, IMP. The tissue segmental ATP level did not differ between markedly the allodynia-negative and allodynia-positive groups. Allodynia-negative, n=3; Allodynia-positive n=3. Error bars represent the mean±SD. (TIF 24681 kb)
Supplementary file4 Supplementary movie 1. Positive response at the injury-level segment on the von Frey test. von Frey filaments were applied perpendicularly to the inferior half of the abdomen. Brisk withdrawal, shaking, lifting, or licking of the testing paw or abdomen were confirmed as positive responses. (MOV 16929 kb)
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Nakajima, N., Ohnishi, Y., Yamamoto, M. et al. Excess intracellular ATP causes neuropathic pain following spinal cord injury. Cell. Mol. Life Sci. 79, 483 (2022). https://doi.org/10.1007/s00018-022-04510-z
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DOI: https://doi.org/10.1007/s00018-022-04510-z