1
|
Huang Y, Xu R, Liu Q, Zhang X, Mao Y, Yang Y, Gu X, Liu Y, Ma Z. Glucose competition between endothelial cells in the blood-spinal cord barrier and infiltrating regulatory T cells is linked to sleep restriction-induced hyperalgesia. BMC Med 2024; 22:189. [PMID: 38715017 PMCID: PMC11077863 DOI: 10.1186/s12916-024-03413-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 04/29/2024] [Indexed: 05/12/2024] Open
Abstract
BACKGROUND Sleep loss is a common public health problem that causes hyperalgesia, especially that after surgery, which reduces the quality of life seriously. METHODS The 48-h sleep restriction (SR) mouse model was created using restriction chambers. In vivo imaging, transmission electron microscopy (TEM), immunofluorescence staining and Western blot were performed to detect the status of the blood-spinal cord barrier (BSCB). Paw withdrawal mechanical threshold (PWMT) was measured to track mouse pain behavior. The role of infiltrating regulatory T cells (Tregs) and endothelial cells (ECs) in mouse glycolysis and BSCB damage were analyzed using flow cytometry, Western blot, CCK-8 assay, colorimetric method and lactate administration. RESULTS The 48-h SR made mice in sleep disruption status and caused an acute damage to the BSCB, resulting in hyperalgesia and neuroinflammation in the spinal cord. In SR mice, the levels of glycolysis and glycolysis enzymes of ECs in the BSCB were found significantly decreased [CON group vs. SR group: CD31+Glut1+ cells: p < 0.001], which could cause dysfunction of ECs and this was confirmed in vitro. Increased numbers of infiltrating T cells [p < 0.0001] and Treg population [p < 0.05] were detected in the mouse spinal cord after 48-h SR. In the co-cultured system of ECs and Tregs in vitro, the competition of Tregs for glucose resulted in the glycolysis disorder of ECs [Glut1: p < 0.01, ENO1: p < 0.05, LDHα: p < 0.05; complete tubular structures formed: p < 0.0001; CCK8 assay: p < 0.001 on 24h, p < 0.0001 on 48h; glycolysis level: p < 0.0001]. An administration of sodium lactate partially rescued the function of ECs and relieved SR-induced hyperalgesia. Furthermore, the mTOR signaling pathway was excessively activated in ECs after SR in vivo and those under the inhibition of glycolysis or co-cultured with Tregs in vitro. CONCLUSIONS Affected by glycolysis disorders of ECs due to glucose competition with infiltrating Tregs through regulating the mTOR signaling pathway, hyperalgesia induced by 48-h SR is attributed to neuroinflammation and damages to the barriers, which can be relieved by lactate supplementation.
Collapse
Affiliation(s)
- Yulin Huang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Rui Xu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Qi Liu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Xiao Zhang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Yanting Mao
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Yan Yang
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China
| | - Xiaoping Gu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China.
| | - Yue Liu
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China.
| | - Zhengliang Ma
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hospital Medical School, Nanjing University, No. 321 of Zhongshan Road, Nanjing, 210008, China.
| |
Collapse
|
2
|
Xiong M, Feng Y, Luo C, Guo J, Zeng J, Deng L, Xiao Q. Teriparatide: an innovative and promising strategy for protecting the blood-spinal cord barrier following spinal cord injury. Front Pharmacol 2024; 15:1386565. [PMID: 38770002 PMCID: PMC11103009 DOI: 10.3389/fphar.2024.1386565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 04/22/2024] [Indexed: 05/22/2024] Open
Abstract
The blood-spinal cord barrier (BSCB) is disrupted within minutes of spinal cord injury, leading to increased permeability and secondary spinal cord injury, resulting in more severe neurological damage. The preservation of blood-spinal cord barrier following spinal cord injury plays a crucial role in determining the prognosis. Teriparatide, widely used in clinical treatment for osteoporosis and promoting fracture healing, has been found in our previous study to have the effect of inhibiting the expression of MMP9 and alleviating blood-brain barrier disruption after ischemic stroke, thereby improving neurological damage symptoms. However, there are limited research on whether it has the potential to improve the prognosis of spinal cord injury. This article summarizes the main pathological mechanisms of blood-spinal cord barrier disruption after spinal cord injury and its relationship with Teriparatide, and explores the therapeutic potential of Teriparatide in improving the prognosis of spinal cord injury by reducing blood-spinal cord barrier disruption.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Qiang Xiao
- Department of Orthopedics, Jiangxi Provincial People’s Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang, China
| |
Collapse
|
3
|
Kim IY, Park CS, Seo KJ, Lee JY, Yune TY. TRPM7 Mediates Neuropathic Pain by Activating mTOR Signaling in Astrocytes after Spinal Cord Injury in Rats. Mol Neurobiol 2024:10.1007/s12035-023-03888-6. [PMID: 38180616 DOI: 10.1007/s12035-023-03888-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 12/14/2023] [Indexed: 01/06/2024]
Abstract
In this study, we investigated whether transient receptor melastatin 7 (TRPM7), known as a non-selective cation channel, inhibits neuropathic pain after spinal cord injury (SCI) and how TRPM7 regulates neuropathic pain. Neuropathic pain was developed 4 weeks after moderate contusive SCI and TRPM7 was markedly upregulated in astrocytes in the lamina I and II of L4-L5 dorsal horn. In addition, both mechanical allodynia and thermal hyperalgesia were significantly alleviated by a TRPM7 inhibitor, carvacrol. In particular, carvacrol treatment inhibited mechanistic target of rapamycin (mTOR) signaling, which was activated in astrocytes. When rats were treated with rapamycin, an inhibitor of mTOR signaling, neuropathic pain was significantly inhibited. Furthermore, blocking TRPM7 and mTOR signaling by carvacrol and rapamycin inhibited astrocyte activation in lamina I and II of dorsal spinal cord and reduced the level of p-JNK and p-c-Jun, which are known to be activated in astrocytes. Finally, inhibiting TRPM7/mTOR signaling also downregulated the production of pain-related factors such as tumor necrosis factor-α, interleukin-6, interleukin-1β, chemokine (C-C motif) ligand (CCL) 2, CCL-3, CCL-4, CCL-20, chemokine C-X-C motif ligand 1, and matrix metalloproteinase 9 which are known to be involved in the induction and/or maintenance of neuropathic pain after SCI. These results suggest an important role of TRPM7-mediated mTOR signaling in astrocyte activation and thereby induction and/or maintenance of neuropathic pain after SCI.
Collapse
Affiliation(s)
- In Yi Kim
- Age-Related and Brain Diseases Research Center, Kyung Hee University, Medical Building 10th Floor, Dongdaemun-Gu, Hoegi-Dong 1, Seoul, 02447, Republic of Korea
- Department of Biomedical Science, Kyung Hee University, Seoul, 02447, Republic of Korea
- Biomedical Science Institute, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Chan Sol Park
- Age-Related and Brain Diseases Research Center, Kyung Hee University, Medical Building 10th Floor, Dongdaemun-Gu, Hoegi-Dong 1, Seoul, 02447, Republic of Korea
- Department of Biomedical Science, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Kyung Jin Seo
- Age-Related and Brain Diseases Research Center, Kyung Hee University, Medical Building 10th Floor, Dongdaemun-Gu, Hoegi-Dong 1, Seoul, 02447, Republic of Korea
- Department of Biomedical Science, Kyung Hee University, Seoul, 02447, Republic of Korea
- Biomedical Science Institute, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Jee Youn Lee
- Age-Related and Brain Diseases Research Center, Kyung Hee University, Medical Building 10th Floor, Dongdaemun-Gu, Hoegi-Dong 1, Seoul, 02447, Republic of Korea.
| | - Tae Young Yune
- Age-Related and Brain Diseases Research Center, Kyung Hee University, Medical Building 10th Floor, Dongdaemun-Gu, Hoegi-Dong 1, Seoul, 02447, Republic of Korea.
- Department of Biomedical Science, Kyung Hee University, Seoul, 02447, Republic of Korea.
- Biomedical Science Institute, Kyung Hee University, Seoul, 02447, Republic of Korea.
- Department of Biochemistry and Molecular Biology, School of Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea.
| |
Collapse
|