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Xu Z, Kombe Kombe AJ, Deng S, Zhang H, Wu S, Ruan J, Zhou Y, Jin T. NLRP inflammasomes in health and disease. MOLECULAR BIOMEDICINE 2024; 5:14. [PMID: 38644450 PMCID: PMC11033252 DOI: 10.1186/s43556-024-00179-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Accepted: 03/20/2024] [Indexed: 04/23/2024] Open
Abstract
NLRP inflammasomes are a group of cytosolic multiprotein oligomer pattern recognition receptors (PRRs) involved in the recognition of pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs) produced by infected cells. They regulate innate immunity by triggering a protective inflammatory response. However, despite their protective role, aberrant NLPR inflammasome activation and gain-of-function mutations in NLRP sensor proteins are involved in occurrence and enhancement of non-communicating autoimmune, auto-inflammatory, and neurodegenerative diseases. In the last few years, significant advances have been achieved in the understanding of the NLRP inflammasome physiological functions and their molecular mechanisms of activation, as well as therapeutics that target NLRP inflammasome activity in inflammatory diseases. Here, we provide the latest research progress on NLRP inflammasomes, including NLRP1, CARD8, NLRP3, NLRP6, NLRP7, NLRP2, NLRP9, NLRP10, and NLRP12 regarding their structural and assembling features, signaling transduction and molecular activation mechanisms. Importantly, we highlight the mechanisms associated with NLRP inflammasome dysregulation involved in numerous human auto-inflammatory, autoimmune, and neurodegenerative diseases. Overall, we summarize the latest discoveries in NLRP biology, their forming inflammasomes, and their role in health and diseases, and provide therapeutic strategies and perspectives for future studies about NLRP inflammasomes.
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Affiliation(s)
- Zhihao Xu
- Center of Disease Immunity and Intervention, College of Medicine, Lishui University, Lishui, 323000, China
| | - Arnaud John Kombe Kombe
- Laboratory of Structural Immunology, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China
| | - Shasha Deng
- Laboratory of Structural Immunology, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China
| | - Hongliang Zhang
- Center of Disease Immunity and Intervention, College of Medicine, Lishui University, Lishui, 323000, China
| | - Songquan Wu
- Center of Disease Immunity and Intervention, College of Medicine, Lishui University, Lishui, 323000, China
| | - Jianbin Ruan
- Department of Immunology, University of Connecticut Health Center, Farmington, 06030, USA.
| | - Ying Zhou
- Department of Obstetrics and Gynecology, Core Facility Center, Division of Life Sciences and Medicine, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, 230001, Anhui, China.
| | - Tengchuan Jin
- Center of Disease Immunity and Intervention, College of Medicine, Lishui University, Lishui, 323000, China.
- Laboratory of Structural Immunology, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China.
- Department of Obstetrics and Gynecology, Core Facility Center, Division of Life Sciences and Medicine, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, 230001, Anhui, China.
- Institute of Health and Medicine, Hefei Comprehensive National Science Center, Hefei, Anhui, China.
- Biomedical Sciences and Health Laboratory of Anhui Province, University of Science & Technology of China, Hefei, 230027, China.
- Clinical Research Hospital of Chinese Academy of Sciences (Hefei), University of Science and Technology of China, Hefei, 230001, China.
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Qin G, Yu X, Zhao Y, Li X, Yu B, Peng H, Yang D. NLRP9 involved in antiviral innate immunity via binding VIM in IPEC-J2 cells. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2023; 147:104895. [PMID: 37473827 DOI: 10.1016/j.dci.2023.104895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 07/17/2023] [Accepted: 07/17/2023] [Indexed: 07/22/2023]
Abstract
BACKGROUND Nucleotide-binding oligomerization domain (NOD)-like receptors with a pyrin domain (PYD)-containing protein 9 (NLRP9) was the first nucleotide-binding region receptor (NLR) proposed to be expressed and function only in the reproductive system. Recent evidence suggests that NLRP9 is also capable of playing a role in infectious and inflammatory diseases. RESULTS AND CONCLUSIONS In this study, we examined the expression of NLRP9 in various tissues of piglets and IPEC-J2 cells. The results showed that high expression of NLRP9 mRNA and protein were detected in both intestine of piglets and IPEC-J2 cells. Both LPS and poly I:C significantly up-regulated NLRP9 protein levels in the IPEC-J2 cells. Besides, poly I:C upregulated the level of transcriptional elements NF-κB, IRF3, IRF7, ISG15, ISG56, OAS1, and IFNB1. Furthermore, interference with the NLRP9 gene in the presence of poly I:C strongly downregulated the expression of all the above genes. Moreover, we demonstrated for the first time that NLRP9 acts in combination with VIM (Vimentin). These results suggested that NLRP9 may participate in the antiviral innate immune by binding to VIM in the porcine intestine. The findings provide preliminary insights into the molecular mechanisms involved in the regulation of mucosal immunity in the porcine intestine by NLRP9.
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Affiliation(s)
- Ge Qin
- School of Animal Science and Technology, Hainan University, Hainan, Haikou, 570228, PR China; College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, PR China
| | - Xiang Yu
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, PR China
| | - Yuanjie Zhao
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, PR China
| | - Xiaoping Li
- School of Animal Science and Technology, Hainan University, Hainan, Haikou, 570228, PR China
| | - Beibei Yu
- School of Animal Science and Technology, Hainan University, Hainan, Haikou, 570228, PR China
| | - Hui Peng
- School of Animal Science and Technology, Hainan University, Hainan, Haikou, 570228, PR China.
| | - Diqi Yang
- School of Animal Science and Technology, Hainan University, Hainan, Haikou, 570228, PR China.
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Mullins B, Chen J. NLRP9 in innate immunity and inflammation. Immunology 2020; 162:262-267. [PMID: 33283292 DOI: 10.1111/imm.13290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 11/06/2020] [Accepted: 11/24/2020] [Indexed: 12/30/2022] Open
Abstract
The nucleotide-binding domain leucine-rich repeat containing receptors (NLRs) are a family of evolutionarily conserved proteins. Several members of NLRs, notably NLRP1, NLRP3 and NLRC4, are able to form cytosolic oligomeric signalling platforms termed inflammasomes to mediate immune response towards pathogens, damage and stress. However, the functions of many NLRs still remain elusive. In the past few years, a couple of less-characterized NLR members are emerging as important signalling molecules with fundamental functions in host defence and inflammation. Among them, NLRP9 is an NLR originally proposed to be expressed and function solely in the reproductive system. Recent evidence has suggested that NLRP9 is also capable of initiating inflammasome formation in the intestine to restrict replication and damage brought by rotavirus infection. Here, we highlight the latest progress in characterization of the role of NLRP9 in infectious and inflammatory diseases, as well as the newest crystallographic and biochemical studies on NLRP9. Finally, we discuss some important questions remained to be answered regarding the molecular and cellular mechanisms governing NLRP9's function in innate immunity and inflammation.
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Affiliation(s)
- Breanne Mullins
- Department of Microbiology, University of Chicago, Chicago, IL, USA
| | - Jueqi Chen
- Department of Microbiology, University of Chicago, Chicago, IL, USA
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Amoushahi M, Sunde L, Lykke-Hartmann K. The pivotal roles of the NOD-like receptors with a PYD domain, NLRPs, in oocytes and early embryo development†. Biol Reprod 2020; 101:284-296. [PMID: 31201414 DOI: 10.1093/biolre/ioz098] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/29/2019] [Accepted: 06/11/2019] [Indexed: 12/19/2022] Open
Abstract
Nucleotide-binding oligomerization domain (NOD)-like receptors with a pyrin domain (PYD), NLRPs, are pattern recognition receptors, well recognized for their important roles in innate immunity and apoptosis. However, several NLRPs have received attention for their new, specialized roles as maternally contributed genes important in reproduction and embryo development. Several NLRPs have been shown to be specifically expressed in oocytes and preimplantation embryos. Interestingly, and in line with divergent functions, NLRP genes reveal a complex evolutionary divergence. The most pronounced difference is the human-specific NLRP7 gene, not identified in rodents. However, mouse models have been extensively used to study maternally contributed NLRPs. The NLRP2 and NLRP5 proteins are components of the subcortical maternal complex (SCMC), which was recently identified as essential for mouse preimplantation development. The SCMC integrates multiple proteins, including KHDC3L, NLRP5, TLE6, OOEP, NLRP2, and PADI6. The NLRP5 (also known as MATER) has been extensively studied. In humans, inactivating variants in specific NLRP genes in the mother are associated with distinct phenotypes in the offspring, such as biparental hydatidiform moles (BiHMs) and preterm birth. Maternal-effect recessive mutations in KHDC3L and NLRP5 (and NLRP7) are associated with reduced reproductive outcomes, BiHM, and broad multilocus imprinting perturbations. The precise mechanisms of NLRPs are unknown, but research strongly indicates their pivotal roles in the establishment of genomic imprints and post-zygotic methylation maintenance, among other processes. Challenges for the future include translations of findings from the mouse model into human contexts and implementation in therapies and clinical fertility management.
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Affiliation(s)
| | - Lone Sunde
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
| | - Karin Lykke-Hartmann
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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Amoushahi M, Steffensen LL, Galieva A, Agger J, Heuck A, Siupka P, Ernst E, Nielsen MS, Sunde L, Lykke-Hartmann K. Maternally contributed Nlrp9b expressed in human and mouse ovarian follicles contributes to early murine preimplantation development. J Assist Reprod Genet 2020; 37:1355-1365. [PMID: 32399794 PMCID: PMC7311623 DOI: 10.1007/s10815-020-01767-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/27/2020] [Indexed: 02/03/2023] Open
Abstract
PURPOSE The aim of the study is to investigate presence and role of the gene encoding the maternally contributed nucleotide-binding oligomerization domain (NOD)-like receptors with a pyrin domain (PYD)-containing protein 9 (NLRP9) in human and mouse ovaries, respectively, and in preimplantation mouse embryo development by knocking down Nlrp9b. METHODS Expression levels of NLRP9 mRNA in human follicles were extracted from RNA sequencing data from previous studies. In this study, we performed a qPCR analysis of Nlpr9b mRNA in mouse oocytes and found it present. Intracellular ovarian distribution of NLRP9B protein was accomplished using immunohistochemistry. The distribution of NLRP9B was explored using a reporter gene approach, fusing NLRP9B to green fluorescent protein and microinjection of in vitro-generated mRNA. Nlrp9b mRNA function was knocked down by microinjection of short interference (si) RNA targeting Nlrp9b, into mouse pronuclear zygotes. Knockdown of the Nlrp9b mRNA transcript was confirmed by qPCR. RESULT We found that the human NLRP9 gene and its corresponding protein are highly expressed in human primordial and primary follicles. The NLRP9B protein is localized to the cytoplasm in the blastomeres of a 2-cell embryo in mice. SiRNA-mediated knockdown of Nlrp9b caused rapid elimination of endogenous Nlrp9b mRNA and premature embryo arrest at the 2- to 4-cell stages compared with that of the siRNA-scrambled control group. CONCLUSIONS These results suggest that mouse Nlrp9b, as a maternal effect gene, could contribute to mouse preimplantation embryo development. It remains to investigate whether NLRP9 have a crucial role in human preimplantation embryo and infertility.
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Affiliation(s)
| | | | - Adelya Galieva
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Jens Agger
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Anders Heuck
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Piotr Siupka
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Erik Ernst
- The Fertility Clinic, Horsens Hospital, Horsens, Denmark.,The Fertility Clinic, Aarhus University Hospital, 8200, Aarhus, Denmark
| | - Morten S Nielsen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Lundbeck Foundation Research Initiative on Brain Barriers and Drug Delivery, Aarhus, Denmark
| | - Lone Sunde
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
| | - Karin Lykke-Hartmann
- Department of Biomedicine, Aarhus University, Aarhus, Denmark. .,Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark. .,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
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Expression and localization of MYH11 in mouse tissues, oocytes and preimplantation embryos. Biologia (Bratisl) 2019. [DOI: 10.2478/s11756-019-00353-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Yanling Q, Xiaoning C, Fei B, Liyun F, Huizhong H, Daqing S. Inhibition of NLRP9b attenuates acute lung injury through suppressing inflammation, apoptosis and oxidative stress in murine and cell models. Biochem Biophys Res Commun 2018; 503:436-443. [PMID: 29655793 DOI: 10.1016/j.bbrc.2018.04.079] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 04/09/2018] [Indexed: 02/07/2023]
Abstract
Acute lung injury (ALI), known a severe disease along with high morbidity and mortality, is lacking of specific therapies. Inflammation, apoptosis and oxidative stress are critical pathologies that contribute to ALI. Recently, there is study indicated that NLRP9b, a NOD-like receptor (NLR) member, is critical in modulation of inflammatory response. However, the effects of NLRP9b on sepsis-associated ALI, and the underlying molecular mechanism have not been understood. In the present study, the wild type (WT) and NLRP9b-knockout (NLRP9b-/-) mice with C57B/L6 background were subjected to a cecal ligation and puncture (CLP) for ALI murine model establishment. The findings indicated that NLRP9b-/- improved the survival rate of CLP-induced ALI mice, and inhibited pulmonary histopathological alterations, inflammation, and apoptosis. NLRP9b-/- reduced the activation of inhibitor of κBα/nuclear factor kappa B (IκBα/NF-κB), apoptosis-associated speck-like protein containing a Caspase-recruitment domain (ASC)/Casapse-1 and Caspase-3/poly (ADP-ribose) polymerase (PARP) signaling pathways in CLP-challenged mice with ALI. In vitro, mouse epithelial cells (MLE-12) were incubated with lipopolysaccharide (LPS) or recombinant NLRP9b caused a significant increased of pro-inflammatory cytokines or chemokine, and reactive oxygen species (ROS) generation; however, these changes were markedly alleviated by NLRP9-knockdown using its specific siRNA sequence. Pre-treatment of MLE-12 cells with ROS scavenger of N-acetylcysteine (NAC) remarkably decreased lipopolysaccharide (LPS)- and rMuNLRP9-induced production of ROS, and the secretion of inflammatory cytokines or chemokine, as well as the activity of IκBα/NF-κB, ASC/Casapse-1 and Caspase-3/PARP signaling pathways. Together, the findings here suggested that NLRP9b played an essential role in lung inflammation, apoptosis and oxidative stress of sepsis-induced ALI animal model or in LPS-induced MLE-12 cells, providing that NLRP9b inhibition might be a potential therapeutic option for ALI.
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Affiliation(s)
- Qiu Yanling
- Department of Pediatric, Baoji Maternal and Child Health Hospital, Baoji City 721000, Shaanxi, China
| | - Cheng Xiaoning
- Department of Pediatric, The Second Affiliated Hospital, Shaanxi University of Traditional Chinese Medicine, Shanxi 712000, China
| | - Bai Fei
- Department of Child Healthcare, Northwest Women and Children Hospital, Xi'an, Shaanxi 710061, China
| | - Fang Liyun
- Department of Pediatric, Xi'an NO.3 Hospital, Xi'an, Shaanxi 710018, China
| | - Hu Huizhong
- Department of Pediatric, Xi'an NO.3 Hospital, Xi'an, Shaanxi 710018, China
| | - Sun Daqing
- Department of Pediatric, Xi'an NO.3 Hospital, Xi'an, Shaanxi 710018, China.
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Abstract
Inflammasome sensors recognize pathogens and danger signals and assemble an immune signaling complex, which induces the secretion of pro-inflammatory cytokines IL-1β and IL-18, and pyroptosis. A new study published in Nature now describes a new inflammasome sensor NLRP9b in intestinal epithelial cells, which in concert with the RNA sensor DHX9, recognize short dsRNA from Rotavirus.
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Peng H, Liu H, Liu F, Gao Y, Chen J, Huo J, Han J, Xiao T, Zhang W. NLRP2 and FAF1 deficiency blocks early embryogenesis in the mouse. Reproduction 2017. [PMID: 28630100 DOI: 10.1530/rep-16-0629] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nlrp2 is a maternal effect gene specifically expressed by mouse ovaries; deletion of this gene from zygotes is known to result in early embryonic arrest. In the present study, we identified FAF1 protein as a specific binding partner of the NLRP2 protein in both mouse oocytes and preimplantation embryos. In addition to early embryos, both Faf1 mRNA and protein were detected in multiple tissues. NLRP2 and FAF1 proteins were co-localized to both the cytoplasm and nucleus during the development of oocytes and preimplantation embryos. Co-immunoprecipitation assays were used to confirm the specific interaction between NLRP2 and FAF1 proteins. Knockdown of the Nlrp2 or Faf1 gene in zygotes interfered with the formation of a NLRP2-FAF1 complex and led to developmental arrest during early embryogenesis. We therefore conclude that NLRP2 interacts with FAF1 under normal physiological conditions and that this interaction is probably essential for the successful development of cleavage-stage mouse embryos. Our data therefore indicated a potential role for NLRP2 in regulating early embryo development in the mouse.
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Affiliation(s)
- Hui Peng
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Haijun Liu
- Tianjin Institute of Animal Science and Veterinary Medicine, Tianjin, People's Republic of China
| | - Fang Liu
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Yuyun Gao
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Jing Chen
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Jianchao Huo
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Jinglin Han
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Tianfang Xiao
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
| | - Wenchang Zhang
- College of Animal Science, Fujian Agriculture and Forestry University, Fujian, Fuzhou, People's Republic of China
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Kuchmiy AA, D'Hont J, Hochepied T, Lamkanfi M. NLRP2 controls age-associated maternal fertility. J Exp Med 2016; 213:2851-2860. [PMID: 27881734 PMCID: PMC5154945 DOI: 10.1084/jem.20160900] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 09/27/2016] [Accepted: 10/24/2016] [Indexed: 11/24/2022] Open
Abstract
Kuchmiy et al. show that Nlrp2, while dispensable for regulation of inflammasome activation, controls maternal fertility with progressing age, playing an unexpected and critical role in maintaining oocyte quality later in life. Nucleotide-binding domain and leucine-rich repeat (NLR) proteins are well-known for their key roles in the immune system. Ectopically expressed NLRP2 in immortalized cell lines assembles an inflammasome and inhibits activation of the proinflammatory transcription factor NF-κB, but the physiological roles of NLRP2 are unknown. Here, we show that Nlrp2-deficient mice were born with expected Mendelian ratios and that Nlrp2 was dispensable for innate and adaptive immunity. The observation that Nlrp2 was exclusively expressed in oocytes led us to explore the role of Nlrp2 in parthenogenetic activation of oocytes. Remarkably, unlike oocytes of young adult Nlrp2-deficient mice, activated oocytes of mature adult mice developed slower and largely failed to reach the blastocyst stage. In agreement, we noted strikingly declining reproductive rates in vivo with progressing age of female Nlrp2-deficient mice. This work identifies Nlrp2 as a critical regulator of oocyte quality and suggests that NLRP2 variants with reduced activity may contribute to maternal age-associated fertility loss in humans.
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Affiliation(s)
- Anna A Kuchmiy
- Inflammation Research Center, VIB, B-9052 Zwijnaarde, Belgium.,Department of Internal Medicine, Ghent University, B-9000 Ghent, Belgium
| | - Jinke D'Hont
- Inflammation Research Center, VIB, B-9052 Zwijnaarde, Belgium.,Department of Biomedical Molecular Biology, Ghent University, B-9000 Ghent, Belgium
| | - Tino Hochepied
- Inflammation Research Center, VIB, B-9052 Zwijnaarde, Belgium.,Department of Biomedical Molecular Biology, Ghent University, B-9000 Ghent, Belgium
| | - Mohamed Lamkanfi
- Inflammation Research Center, VIB, B-9052 Zwijnaarde, Belgium .,Department of Internal Medicine, Ghent University, B-9000 Ghent, Belgium
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