Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR
ABSTRACT Neurobrucellosis represents a severe complication of brucellosis, posing a considerable risk to human health and quality of life. This condition arises from an increased susceptibility to chronic Brucella infection, a significant clinical challenge. One key factor contributing to chronic ne...
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American Society for Microbiology
2025-03-01
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| Online Access: | https://journals.asm.org/doi/10.1128/msphere.00941-24 |
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| author | Zhao Wang Yanbai Wang Shulong Yang Zhenhai Wang Qian Yang |
| author_facet | Zhao Wang Yanbai Wang Shulong Yang Zhenhai Wang Qian Yang |
| author_sort | Zhao Wang |
| collection | DOAJ |
| description | ABSTRACT Neurobrucellosis represents a severe complication of brucellosis, posing a considerable risk to human health and quality of life. This condition arises from an increased susceptibility to chronic Brucella infection, a significant clinical challenge. One key factor contributing to chronic neurobrucellosis is the regulation of microglial apoptosis by Brucella; however, the exact molecular mechanisms remain largely unresolved. In this study, human microglial clone 3 (HMC3) cells were infected with Brucella suis vaccine strain S2 (B. suis S2) at varying multiplicity of infection (MOI) and durations to assess its effects on the IRE1/caspase-12/caspase-3 signaling pathway. Following the suppression of this pathway by B. suis S2, calreticulin (CALR) was identified through ubiquitin-modified proteomics (data accessible via ProteomeXchange, identifier PXD056006). To further investigate, CALR-overexpression and knockdown HMC3 cell lines were infected with B. suis S2 to elucidate the mechanism by which B. suis S2 inhibits apoptosis in HMC3 cells. In conclusion, our findings demonstrate that B. suis S2 suppresses HMC3 cell apoptosis via the IRE1/caspase-12/caspase-3 pathway by modulating CALR ubiquitination. This study provides a theoretical basis for exploring the mechanisms of neurobrucellosis and offers insights into its clinical treatment.IMPORTANCENeurobrucellosis is a severe complication impacting the central nervous system (CNS) due to neurological deficits caused by Brucella, with primary clinical features including meningitis, encephalitis, brain abscesses, and demyelinating lesions. These nonspecific symptoms often lead to misdiagnosis or delayed diagnosis, increasing the risk of recurrent or chronic neurobrucellosis infections. Consequently, persistent infection and relapse are critical challenges in the clinical management of neurobrucellosis, which are closely linked to Brucella’s survival and replication within microglia. Interestingly, Brucella may inhibit microglia apoptosis by mitigating endoplasmic reticulum (ER) stress, though the precise molecular mechanisms remain largely unexplored. Thus, this study will elucidate the specific mechanisms by which Brucella suppresses microglial apoptosis and provide deeper insights into the molecular pathogenesis and clinical treatment of neurobrucellosis. |
| format | Article |
| id | doaj-art-e4f98799fd0d4faa852c6d84f09eb8ea |
| institution | DOAJ |
| issn | 2379-5042 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | American Society for Microbiology |
| record_format | Article |
| series | mSphere |
| spelling | doaj-art-e4f98799fd0d4faa852c6d84f09eb8ea2025-08-20T02:40:33ZengAmerican Society for MicrobiologymSphere2379-50422025-03-0110310.1128/msphere.00941-24Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALRZhao Wang0Yanbai Wang1Shulong Yang2Zhenhai Wang3Qian Yang4Department of Experimental Surgery, The Second Affiliated Hospital of Air Force Medical University, Xi'an, ChinaDepartment of Neurology, The General Hospital of Ningxia Medical University, Yinchuan, ChinaDepartment of Orthopedics, The People’s Hospital of Wuhai, Wuhai, ChinaDepartment of Neurology, The General Hospital of Ningxia Medical University, Yinchuan, ChinaDepartment of Experimental Surgery, The Second Affiliated Hospital of Air Force Medical University, Xi'an, ChinaABSTRACT Neurobrucellosis represents a severe complication of brucellosis, posing a considerable risk to human health and quality of life. This condition arises from an increased susceptibility to chronic Brucella infection, a significant clinical challenge. One key factor contributing to chronic neurobrucellosis is the regulation of microglial apoptosis by Brucella; however, the exact molecular mechanisms remain largely unresolved. In this study, human microglial clone 3 (HMC3) cells were infected with Brucella suis vaccine strain S2 (B. suis S2) at varying multiplicity of infection (MOI) and durations to assess its effects on the IRE1/caspase-12/caspase-3 signaling pathway. Following the suppression of this pathway by B. suis S2, calreticulin (CALR) was identified through ubiquitin-modified proteomics (data accessible via ProteomeXchange, identifier PXD056006). To further investigate, CALR-overexpression and knockdown HMC3 cell lines were infected with B. suis S2 to elucidate the mechanism by which B. suis S2 inhibits apoptosis in HMC3 cells. In conclusion, our findings demonstrate that B. suis S2 suppresses HMC3 cell apoptosis via the IRE1/caspase-12/caspase-3 pathway by modulating CALR ubiquitination. This study provides a theoretical basis for exploring the mechanisms of neurobrucellosis and offers insights into its clinical treatment.IMPORTANCENeurobrucellosis is a severe complication impacting the central nervous system (CNS) due to neurological deficits caused by Brucella, with primary clinical features including meningitis, encephalitis, brain abscesses, and demyelinating lesions. These nonspecific symptoms often lead to misdiagnosis or delayed diagnosis, increasing the risk of recurrent or chronic neurobrucellosis infections. Consequently, persistent infection and relapse are critical challenges in the clinical management of neurobrucellosis, which are closely linked to Brucella’s survival and replication within microglia. Interestingly, Brucella may inhibit microglia apoptosis by mitigating endoplasmic reticulum (ER) stress, though the precise molecular mechanisms remain largely unexplored. Thus, this study will elucidate the specific mechanisms by which Brucella suppresses microglial apoptosis and provide deeper insights into the molecular pathogenesis and clinical treatment of neurobrucellosis.https://journals.asm.org/doi/10.1128/msphere.00941-24neurobrucellosisBrucella suis S2endoplasmic reticulum stressmicrogliaapoptosisIRE1/caspase-12/caspase-3 pathway |
| spellingShingle | Zhao Wang Yanbai Wang Shulong Yang Zhenhai Wang Qian Yang Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR mSphere neurobrucellosis Brucella suis S2 endoplasmic reticulum stress microglia apoptosis IRE1/caspase-12/caspase-3 pathway |
| title | Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR |
| title_full | Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR |
| title_fullStr | Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR |
| title_full_unstemmed | Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR |
| title_short | Brucella suis S2 strain inhibits IRE1/caspase-12/caspase-3 pathway-mediated apoptosis of microglia HMC3 by affecting the ubiquitination of CALR |
| title_sort | brucella suis s2 strain inhibits ire1 caspase 12 caspase 3 pathway mediated apoptosis of microglia hmc3 by affecting the ubiquitination of calr |
| topic | neurobrucellosis Brucella suis S2 endoplasmic reticulum stress microglia apoptosis IRE1/caspase-12/caspase-3 pathway |
| url | https://journals.asm.org/doi/10.1128/msphere.00941-24 |
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