Micheliolide

The herbs of Michelia compressa

Micheliolide could effectively attenuate the high glucose-stimulated activation of NF-κB, the degradation of IκBα, and the expression of MCP-1, TGF-β1 and FN in rat mesangial cells (MCs).

References:
[1]. Jia QQ, et al. Sesquiterpene lactones and their derivatives inhibit high glucose-induced NF-κB activation and MCP-1 and TGF-β1 expression in rat mesangial cells. Molecules. 2013 Oct 21;18(10):13061-77.

Antineoplastic effects and mechanisms of micheliolide in acute myelogenous leukemia stem cells.[Pubmed:27542251]

Oncotarget. 2016 Oct 4;7(40):65012-65023.

Leukemic stem cells (LSCs) greatly contribute to the initiation, relapse, and multidrug resistance of leukemia. Current therapies targeting the cell cycle and rapidly growing leukemic cells, including conventional chemotherapy, have little effect due to the self-renewal and differentiated malignant cells replenishment ability of LSCs despite their scarce supply in the bone marrow. Micheliolide (MCL) is a natural guaianolide sesquiterpene lactone (GSL) which was discovered in michelia compressa and michelia champaca plants, and has been shown to exert selective cytotoxic effects on CD34+CD38- LSCs. In this study, we demonstrate that DMAMCL significantly prolongs the lifespan of a mouse model of human acute myelogenous leukemia (AML). Mechanistic investigations further revealed that MCL exerted its cytotoxic effects via inhibition of NF-kappaB expression and activity, and by generating intracellular reactive oxygen species (ROS). These results provide valuable insight into the mechanisms underlying MCL-induced cytotoxicity of LSCs, and support further preclinical investigations of MCL-related therapies for the treatment of AML.

New cytotoxic sesquiterpene lactones from Anthemis scrobicularis.[Pubmed:25227949]

J Asian Nat Prod Res. 2014;16(9):922-9.

Four new sesquiterpene lactones, 4alpha-hydroxy-guaia-10(14),11(13)-diene-12,6alpha-olide (1), 4alpha-hydroxy-9alpha-acetoxy-guaia-1(10),2-diene-12,6alpha-olide (4), 4alpha-hydroxy-9beta-acetoxy-guaia-1(10),2-diene-12,6alpha-olide (5), and 1alpha,4alpha-dihydroxy-9alpha-acetoxy-guaia-10(14),2-diene-12,6alpha-olide (6), were isolated from the aerial parts of Anthemis scrobicularis. Their structures were elucidated on the basis of their IR, NMR, and MS spectroscopic data. In addition, two known sesquiterpene lactones Micheliolide (2) and achillin (3) were also isolated. The cytotoxicity of some of the isolated compounds was tested against HCT 116, HepG-2, and MCF-7 cell lines. Micheliolide and 4alpha-hydroxy-guaia-10(14),11(13)-diene-12,6alpha-olide showed pronounced inhibitory activity while 4alpha-hydroxy-9alpha-acetoxy-guaia-1(10),2-diene-12,6alpha-olide showed weak activity.

Micheliolide suppresses LPS-induced neuroinflammatory responses.[Pubmed:29040306]

PLoS One. 2017 Oct 17;12(10):e0186592.

Microglia-involved neuroinflammation is thought to promote brain damage in various neurodegenerative disorders. Thus, inhibition of microglial over-activation may have a therapeutic benefit for the treatment of neurodegenerative disorders. Micheliolide (MCL) is a sesquiterpene lactone which inhibits various inflammatory response. However, whether MCL can inhibit neuroinflammation caused by LPS-activated BV2 microglia has not yet been explored. In this study, we demonstrated that treatment of BV2 cells with MCL significantly repressed LPS-stimulated nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) expression, as well as tumor necrosis factor-alpha (TNF-alpha), interleukin-6 (IL-6) and nitric oxide (NO) induction. MCL also attenuated mRNA levels of multiple pro-inflammatory cytokines and mediators such as iNOS, COX-2, TNF-alpha, IL-6 and IL-1beta. Mechanistic studies revealed that MCL suppressed LPS-stimulated the activation of IkappaBalpha/NF-kappaB pathway and Akt pathway. Moreover, MCL inhibited LPS-induced the activition of c-Jun N-terminal kinase (JNK), p38 MAPK kinase, and extracellular signal-regulated kinases 1/2 (ERK1/2). Meanwhile, MCL markedly promoted antioxidant protein heme oxygenase-1 (HO-1) expression by enhancing NF-E2-related factor 2 (Nrf2) activity. Together, our results imply that MCL may serve as a neuroprotective agent in neuroinflammation-related neurodegenerative disorders.

Micheliolide alleviates hepatic steatosis in db/db mice by inhibiting inflammation and promoting autophagy via PPAR-gamma-mediated NF-small ka, CyrillicB and AMPK/mTOR signaling.[Pubmed:29656210]

Int Immunopharmacol. 2018 Jun;59:197-208.

The anti-inflammatory, immunomodulatory, and anticancer effects of Micheliolide (MCL) isolated from Michelia champaca were previously reported, but its role and underlying mechanisms in relieving liver steatosis remain unclear. Herein, we investigated the effects of MCL on hepatic steatosis using a db/db mouse model and lipid mixture (LM)-induced AML12 and LO2 cells. The body and liver weights, food consumption, lipid content and liver aminotransferase levels in serum, the lipid content and inflammatory cytokine levels in liver tissue, and the extent of hepatic steatosis in db/db mice were increased compared with those in db/m mice, and these increases were reversed by MCL treatment. Similarly, MCL also attenuated the inflammatory responses and lipid accumulation in LM-treated AML12 and L02 cells by upregulating PPAR-gamma and decreasing p-Ismall ka, CyrillicBalpha and p-NF-kappaB/p65, thereby inhibiting the NF-kappaB pathway and reducing lipotoxicity. Furthermore, MCL administration increased LC3B, Atg7 and Beclin-1 expression and the LC3B-II/I ratio in db/db mouse livers and LM-treated AML12 and L02 cells, and these MCL-induced increases were mediated by the activation of PPAR-gamma and p-AMPK and inhibition of p-mTOR and induce autophagy. These effects were blocked by PPAR-gamma and AMPK inhibitors. Our findings suggest that MCL ameliorates liver steatosis by upregulating PPAR-gamma expression, thereby inhibiting NF-kappaB-mediated inflammation and activating AMPK/mTOR-dependent autophagy.

MCL Plays an Anti-Inflammatory Role in Mycobacterium tuberculosis-Induced Immune Response by Inhibiting NF-kappaB and NLRP3 Inflammasome Activation.[Pubmed:28642632]

Mediators Inflamm. 2017;2017:2432904.

Mycobacterium tuberculosis (Mtb) remains a significant menace to global health as it induces granulomatous lung lesions and systemic inflammatory responses during active tuberculosis (TB). Micheliolide (MCL), a sesquiterpene lactone, was recently reported to have a function of relieving LPS-induced inflammatory response, but the regulative role of MCL on the immunopathology of TB still remains unknown. In this experiment, we examined the inhibitory effect of MCL on Mtb-induced inflammatory response in mouse macrophage-like cell line Raw264.7 by downregulating the activation of nuclear factor kappa B (NF-kappaB) and NLRP3 inflammasome. Evidences showed that MCL decreased the secretion of Mtb-induced inflammatory cytokines (IL-1beta and TNF-alpha) in a dose-dependent manner. Meanwhile, MCL dramatically suppressed Mtb-induced activation of iNOS and COX2 as well as subsequent production of NO. Furthermore, MCL inhibited Mtb-induced phosphorylation of Akt (Ser 473) in Raw264.7. According to our results, MCL plays an important role in modulating Mtb-induced inflammatory response through PI3K/Akt/NF-kappaB pathway and subsequently downregulating the activation of NLRP3 inflammasome. Therefore, MCL may represent as a potential drug candidate in the adjuvant treatment of TB by regulating host immune response.

Sesquiterpene lactones and their derivatives inhibit high glucose-induced NF-kappaB activation and MCP-1 and TGF-beta1 expression in rat mesangial cells.[Pubmed:24152676]

Molecules. 2013 Oct 21;18(10):13061-77.

Diabetic nephropathy (DN) is one of the most common and serious chronic complications of diabetes mellitus, however, no efficient clinical drugs exist for the treatment of DN. We selected and synthesized several sesquiterpene lactones (SLs), and then used the MTT assay to detect rat mesangial cells (MCs) proliferation, ELISA to measure the expression level of monocyte chemoattractant protein-1 (MCP-1), transforming growth factor beta (TGF-beta1) and fibronectin(FN), real-time fluorescent quantitative PCR analysis to measure the MCP-1 and TGF-beta1 gene expression, western blot to detect the level of IkappaBalpha protein and EMSA to measure the activation of nuclear factor kappa B (NF-kappaB). We discovered that SLs, including parthenolide (PTL), Micheliolide (MCL), arglabin, and isoalantolactone (IAL), as well as several synthetic analogs of these molecules, could effectively attenuate the high glucose-stimulated activation of NF-kappaB, the degradation of IkappaBalpha, and the expression of MCP-1, TGF-beta1 and FN in rat mesangial cells (MCs). These findings suggest that SLs and their derivatives have potential as candidate drugs for the treatment of DN.

Micheliolide could effectively attenuate the high glucose-stimulated activation of NF-κB, the degradation of IκBα, and the expression of MCP-1, TGF-β1 and FN in rat mesangial cells (MCs).

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