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Nucleotide oligomerization domain (NOD)-like receptors (NLRs) are critical cytoplasmic pattern-recognition receptors (PRRs) that play an important role in the host innate immune response and immunity homeostasis. There are 23 NLR family members in humans and at least 34 NLR genes in mice. NLRs are expressed in many cell types including immune cells and epithelial cells, although certain NLR family members are expressed primarily in phagocytes including macrophages and neutrophils. The NLR family are most commonly classified according to their N-terminal domain, falling into one of four subfamilies; NLRA, NLRB, NLRC and NLRP.
The NLRs recognize various ligands from microbial pathogens (peptidoglycan, flagellin, viral RNA, fungal hyphae, etc.), host cells (ATPs, cholesterol crystals, uric acid, etc.), and environmental sources (alum, asbestos, silica, alloy particles, UV radiation, skin irritants, etc.). Most NLRs act as PRRs, recognizing the above ligands and activate inflammatory responses. However, some NLRs may not act as PRRs but instead respond to cytokines such as interferons. The activated NLRs show various functions that can be divided into four broad categories: inflammasome formation, signaling transduction, transcription activation, and autophagy.
NOD-like Receptor (NLR) Isoform Specific Products:
Mouse Serum Albumin is most abundant protein in plasma, which leaks into the brain parenchyma when the blood-brain barrier (BBB) is impaired. Mouse Serum Albumin induces astrocytes to A1 phenotype to remarkably increase levels of Elovl1. Mouse Serum Albumin promotes VLSFAs secretion and causes neuronal lippoapoptosis through endoplasmic reticulum stress response pathway. MSA-activated microglia triggeres remarkable tau phosphorylation at multiple sites (Ser202/Thr205) through NLRP3 inflammasome pathway. Mouse Serum Albumin decreases the spatial learning and memory abilities in mice. Mouse Serum Albumin can be used for the study of neurodegenerative diseases like Alzheimer’s disease (AD) and frontotemporal dementia (FTD).
Plantainoside D, a phenylethanoid glycosides, is a IKK-β inhibitor with diverse biological activities. Plantainoside D shows inhibitory activity of angiotensin-converting enzyme (ACE) with an IC50 of 2.17 mM. Plantainoside D significantly reduces the release of glutamate from nerve terminals in the cerebral cortex of rats by inhibiting the voltage-dependent calcium channel (VDCCs) and protein kinase C (PKC) signaling cascade. Plantainoside D significantly alleviates cell apoptosis by inhibiting the generation of ROS and the activation of NF-κB. Plantainoside D significantly improves acute lung injury (ALI) induced by sepsis by regulating the Sirt3/NLRP3 signaling pathway. Plantainoside D can be used for the study of neuroprotection, antioxidant, anti-inflammation, antihypertension.
Ofirnoflastum (Ofirnoflast) is an orally active first-in-class allosteric NEK7 inhibitor with an IC50 of 46 nM. Ofirnoflastum binds an allosteric site adjacent to NEK7’s ATP-binding pocket, induces conformational shifts, disrupts NEK7-NLRP3 binding, blocks NLRP3 inflammasome assembly, spares NEK7’s physiological functions, and suppresses caspase-1, caspase-8, NF-κB, and TNF activity. Ofirnoflastum reduces pro-inflammatory cytokine production, suppresses ASC specks, IL-1β release, pyroptotic cell death, and leukemic burden, induces apoptosis and erythroid differentiation, restores hematopoiesis, and improves outcomes in colitis models. Ofirnoflastum can be used for the research of myelodysplastic syndromes, chronic myelomonocytic leukemia, and acute myeloid leukemia.
Thiolutin (Acetopyrrothin) is a sulfur-containing antibiotic, which is a potent inhibitor of bacterial and yeast RNA polymerases. Thiolutin can be produced by Streptomyces. Thiolutin inhibits AMSH (IC50 = 4 μM) and Rpn11 (IC50 = 0.53 μM). Thiolutin is a dual inhibitor of BRCC36 and the NLRP3 inflammasome, exhibiting anti-inflammatory effects. Thiolutin effectively suppresses the interaction between BRCC36 and HMGCR, leading to the inhibition of HCC growth. Thiolutin attenuates pyroptosis and NLRP3 inflammasome activation. Thiolutin markedly alleviates renal injury and inflammatory process in IgAN. Thiolutin is an anti-angiogenic compound which can ease Doxorubicin-induced cardiotoxicity (DOXIC)[1][2][3][4][5].
NP3-253 is an orally active and brain-penetranted NLRP3 inflammasome inhibitor. NP3-253 functions as a molecular glue that prevents NACHT-subdomain rearrangements, locking NLRP3 in an inactive conformation. NP3-253 inhibits production of pro-inflammatory cytokines IL-1β and IL-18. NP3-253 can be used for the research of inflammation and neurological disease, suah as peritonitis.
CVN293 is a selective and brain permeable potassium ion (K+) channel KCNK13 inhibtor with IC50s of 41 nM and 28 nM for hKCNK13 and mKCNK13, respectively. CVN293 potently inhibits the NLRP3-inflammasome mediated production of the proinflammatory cytokine IL-1β in microglia.
NOD-IN-1 is a potent mixed inhibitor of nucleotide-binding oligomerization domain (NOD)-like receptors, NOD1 and NOD2, with IC50 of 5.74 μM and 6.45 μM, respectively.
Dexpramipexole ((R)-Pramipexole) dihydrochloride is an orally active, blood-brain barrier permeable mitochondrial protective agent. Dexpramipexole dihydrochloride upregulates the expression of Parkin, PINK1, GPX4 and FSP1; binds to mitochondrial F1/Fo-ATP synthase; blocks the Nav1.8 sodium channel; and inhibits the activation of the NLRP3 inflammasome. Dexpramipexole dihydrochloride induces mitophagy, inhibits ferroptosis, pyroptosis, apoptosis, neuroinflammation and eosinophilopoiesis; maintains mitochondrial function and redox homeostasis; reduces reactive oxygen species production; and decreases myocardial infarct size. Dexpramipexole dihydrochloride is applicable to studies on eosinophilic asthma, myocardial ischemia/reperfusion injury, sepsis-associated encephalopathy, analgesia, and more.
(S)-(+)-Carvone is an orally active natural product. (S)-(+)-Carvone increases the activity of antioxidant enzymes (SOD, CAT) and ROS, reduces the levels of oxidative stress markers (MDA, AChE), reduces the secretion of proinflammatory cytokines (IL-1β, IL-4, IL-6, IL-10), and downregulates NLRP3. (S)-(+)-Carvone increases the activities of caspase-8, -9 and -3. (S)-(+)-Carvone induces apoptotic death. (S)-(+)-Carvone has antimanic-like effect, liver protection and anticancer activity against skin cancer. (S)-(+)-Carvone improves memory and arthritis.
Dehydrodiisoeugenol is an orally active anti-inflammatory and anti-tumor agent. Dehydrodiisoeugenol inhibits the proliferation of colorectal cancer cells, and induces apoptosis, autophagy, endoplasmic reticulum stress and cell cycle arrest. Dehydrodiisoeugenol also exerts anti-inflammatory effects by inhibiting the activation of NF-κB and the expression of COX-2. Dehydrodiisoeugenol can be used in the research related to colorectal cancer, inflammatory diseases and ulcerative colitis.
NK7-902 diTFA is a selective and orally active CRBN-dependent NEK7 molecular glue degrader with Kd values of 1.5 and 2.6 μM for hNEK7 and mNEK7. NK7-902 diTFA fully degrades NEK7 in human primary monocytes and whole blood but only partially inhibits NLRP3-dependent IL-1β production. NK7-902 diTFA shows activity in murine systems and induces a profound and long-lasting NEK7 degradation but only transiently blocks NLRP3 inflammasome activation. NK7-902 diTFA can be used for the research of inflammation, such as cryopyrin-associated periodic syndromes.
Arglabin ((+)-Arglabin), a natural product isolated from Artemisia glabella, is a NLRP3 inflammasome inhibitor. Arglabin shows anti-inflammatory and antitumor activities. The antitumor activity of Arglabin proceeds through its inhibition of farnesyl transferase which leads to the activation of RAS proto-oncogene.
Epimedin A, one of the main flavonoid active components in Herba Epimedii, is orally active. Epimedin A can inhibit osteoclastogenesis, differentiation, and bone resorption. Epimedin A also possesses anti-inflammatory activity. Epimedin A can be used in the research of osteoporosis and inflammatory diseases.
(+)-Magnoflorine (α-Magnoflorine) iodide is an orally active aporphine alkaloid with multiple biological activities. (+)-Magnoflorine iodide promotes Parkin/PINK1 -mediated mitochondrial autophagy, inhibits the activation of NLRP3/Caspase-1 pathway, regulates the intestinal microbiota, and exhibits significant anti-inflammatory and immunomodulatory activities. (+)-Magnoflorine iodide inhibits JNK and TLR4/NF-κB signaling pathways, activates Sirt1/AMPK pathway, alleviates neuronal oxidative stress and apoptosis. Magnoflorine upregulates miR-410-3p, inhibits HMGB1/NF-κB pathway, and has anti-tumor activity. (+)-Magnoflorine iodide also has significant antifungal activity.
Gypenoside XLIX is a multifunctional bioactive compound that can be isolated from Gynostemma pentaphyllum, with a Ka value of 1.58 μM for its binding to SIRT1. Gypenoside XLIX acts as a PPAR-α agonist. It inhibits the activation of TLR4-mediated NF-κB signaling pathway by activating the Sirt1/Nrf2 signaling pathway, reduces ROS accumulation, and alleviates hepatic inflammatory injury in mice with sepsis-induced liver disease. Gypenoside XLIX targets SIRT1 to block YAP-NLRP3 activation and improve sepsis-induced cardiomyopathy. Gypenoside XLIX inhibits apoptosis (Apoptosis), pyroptosis (Pyroptosis), autophagy (Autophagy), lipid peroxidation, pro-inflammatory cytokines and anti-inflammatory cytokines. Gypenoside XLIX alleviates sepsis-induced splenic injury by inhibiting inflammation and oxidative stress, and mitigates sepsis-associated encephalopathy by targeting PPAR-α. Gypenoside XLIX prevents acute kidney injury by inhibiting IGFBP7/IGF1R-mediated programmed cell death and inflammation. Gypenoside XLIX inhibits the expression and activity of vascular cell adhesion molecule-1 in cytokine-induced human endothelial cells. Gypenoside XLIX is applicable to research related to acute liver injury, lung injury, cardiomyopathy, acute splenic injury, sepsis-associated encephalopathy, acute kidney injury, atherosclerosis and chronic inflammation.
BAL-0028 is a reversible inhibitor of NLRP3 activation with an IC50 value of 25 nM. BAL-0028 binds closely to the NACHT domain of the NLRP3 with KD values of 104-123 nM. BAL-0028 can inhibit the secretion of IL-1β and has anti-inflammatory activity.
(-)-Maackiain is a pterocarpan phytoalexin produced from Sophora flavescens. (-)-Maackiain is toxic to several genera of fungal pathogens of legume and non legume hosts. (-)-Maackiain enhances the activation of NLRP3 inflammasome, inhibits the activation of NF-κB pathway, exhibiting thereby immunostimulatory and anti-inflammatory activities. (-)-Maackiain is orally active.
NP-1815-PX sodium is an orally active dual inhibitor of P2X4 and prostaglandin TP receptors, with an IC50 of 0.26 μM against human P2X4 receptors. NP-1815-PX sodium specifically inhibits ATP-mediated prostaglandin production, TP receptor-induced calcium elevation, and the canonical/non-canonical NLRP3 inflammasome signaling pathway. NP-1815-PX sodium selectively blocks smooth muscle contractions induced by ATP, U46619 (HY-108566) and prostaglandin F2α. NP-1815-PX sodium not only produces anti-allodynic effects in vivo, but also significantly alleviates symptoms of DNBS (HY-W324435)-induced colitis (such as weight loss and tissue damage). NP-1815-PX sodium exerts anti-inflammatory effects by downregulating IL-1β levels and Caspase-1 activity. NP-1815-PX sodium is used in studies related to asthma and inflammatory bowel disease (colitis).
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