Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice
Chuang Lyu,1,2 Gong-Wei Lyu,3 Aurora Martinez,4 Tie-Jun Sten Shi4 1State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin, People’s Republic of China; 2Department of Neuroscience, Karolinska Institutet, Sto...
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| Format: | Article |
| Language: | English |
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Dove Medical Press
2017-08-01
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| Series: | Journal of Pain Research |
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| Online Access: | https://www.dovepress.com/effect-of-nerve-injury-on-the-number-of-dorsal-root-ganglion-neurons-a-peer-reviewed-article-JPR |
| _version_ | 1811242374359154688 |
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| author | Lyu C Lyu GW Martinez A Shi TJS |
| author_facet | Lyu C Lyu GW Martinez A Shi TJS |
| author_sort | Lyu C |
| collection | DOAJ |
| description | Chuang Lyu,1,2 Gong-Wei Lyu,3 Aurora Martinez,4 Tie-Jun Sten Shi4 1State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin, People’s Republic of China; 2Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden; 3Department of Neurology, 1st Hospital of Harbin Medical University, Harbin, People’s Republic of China; 4Department of Biomedicine, University of Bergen, Bergen, Norway Background: The proapoptotic molecule BAX, plays an important role in mitochondrial apoptotic pathway. Dorsal root ganglion (DRG) neurons depend on neurotrophic factors for survival at early developmental stages. Withdrawal of neurotrophic factors will induce apoptosis in DRG neurons, but this type of cell death can be delayed or prevented in neonatal Bax knockout (KO) mice. In adult animals, evidence also shows that DRG neurons are less dependent upon neurotrophic factors for survival. However, little is known about the effect of Bax deletion on the survival of normal and denervated DRG neurons in adult mice. Methods: A unilateral sciatic nerve transection was performed in adult Bax KO mice and wild-type (WT) littermates. Stereological method was employed to quantify the number of lumbar-5 DRG neurons 1 month post-surgery. Nerve injury-induced autotomy behavior was also examined on days 1, 3, and 7 post-surgery. Results: There were significantly more neurons in contralateral DRGs of KO mice as compared with WT mice. The number of neurons was reduced in ipsilateral DRGs in both KO and WT mice. No changes in size distributions of DRG neuron profiles were detected before or after nerve injury. Injury-induced autotomy behavior developed much earlier and was more serious in KO mice. Conclusion: Although postnatal death or loss of DRG neurons is partially prevented by Bax deletion, this effect cannot interfere with long-term nerve injury-induced neuronal loss. The exaggerated self-amputation behavior observed in the mutant mice indicates that Bax deficiency may enhance the development of spontaneous pain following nerve injury. Keywords: apoptosis, axotomy, cell death, chronic pain, unbiased counting method, sensory neurons |
| first_indexed | 2024-04-12T13:50:21Z |
| format | Article |
| id | doaj.art-6ca5a16b8193413fbf7ba307521004a0 |
| institution | Directory Open Access Journal |
| issn | 1178-7090 |
| language | English |
| last_indexed | 2024-04-12T13:50:21Z |
| publishDate | 2017-08-01 |
| publisher | Dove Medical Press |
| record_format | Article |
| series | Journal of Pain Research |
| spelling | doaj.art-6ca5a16b8193413fbf7ba307521004a02022-12-22T03:30:33ZengDove Medical PressJournal of Pain Research1178-70902017-08-01Volume 102079208734498Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient miceLyu CLyu GWMartinez AShi TJSChuang Lyu,1,2 Gong-Wei Lyu,3 Aurora Martinez,4 Tie-Jun Sten Shi4 1State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin, People’s Republic of China; 2Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden; 3Department of Neurology, 1st Hospital of Harbin Medical University, Harbin, People’s Republic of China; 4Department of Biomedicine, University of Bergen, Bergen, Norway Background: The proapoptotic molecule BAX, plays an important role in mitochondrial apoptotic pathway. Dorsal root ganglion (DRG) neurons depend on neurotrophic factors for survival at early developmental stages. Withdrawal of neurotrophic factors will induce apoptosis in DRG neurons, but this type of cell death can be delayed or prevented in neonatal Bax knockout (KO) mice. In adult animals, evidence also shows that DRG neurons are less dependent upon neurotrophic factors for survival. However, little is known about the effect of Bax deletion on the survival of normal and denervated DRG neurons in adult mice. Methods: A unilateral sciatic nerve transection was performed in adult Bax KO mice and wild-type (WT) littermates. Stereological method was employed to quantify the number of lumbar-5 DRG neurons 1 month post-surgery. Nerve injury-induced autotomy behavior was also examined on days 1, 3, and 7 post-surgery. Results: There were significantly more neurons in contralateral DRGs of KO mice as compared with WT mice. The number of neurons was reduced in ipsilateral DRGs in both KO and WT mice. No changes in size distributions of DRG neuron profiles were detected before or after nerve injury. Injury-induced autotomy behavior developed much earlier and was more serious in KO mice. Conclusion: Although postnatal death or loss of DRG neurons is partially prevented by Bax deletion, this effect cannot interfere with long-term nerve injury-induced neuronal loss. The exaggerated self-amputation behavior observed in the mutant mice indicates that Bax deficiency may enhance the development of spontaneous pain following nerve injury. Keywords: apoptosis, axotomy, cell death, chronic pain, unbiased counting method, sensory neuronshttps://www.dovepress.com/effect-of-nerve-injury-on-the-number-of-dorsal-root-ganglion-neurons-a-peer-reviewed-article-JPRapoptosisaxotomycell deathchronic painunbiased counting methodsensory neurons |
| spellingShingle | Lyu C Lyu GW Martinez A Shi TJS Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice Journal of Pain Research apoptosis axotomy cell death chronic pain unbiased counting method sensory neurons |
| title | Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice |
| title_full | Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice |
| title_fullStr | Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice |
| title_full_unstemmed | Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice |
| title_short | Effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult Bax-deficient mice |
| title_sort | effect of nerve injury on the number of dorsal root ganglion neurons and autotomy behavior in adult bax deficient mice |
| topic | apoptosis axotomy cell death chronic pain unbiased counting method sensory neurons |
| url | https://www.dovepress.com/effect-of-nerve-injury-on-the-number-of-dorsal-root-ganglion-neurons-a-peer-reviewed-article-JPR |
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