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A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway [II]

ABSTRACT: AMP-activated protein kinase (AMPK) stabilizes tubular cell metabolism and protects against renal fibrosis through promoting autophagy and mitochondrial homeostasis. Liver kinase B1 (LKB1) is the key regulator for AMPK activation. However, the direct activators of LKB1 are scarce in commercial. In this study, we report a novel LKB1 activator, the piericidin analogue S14 (PA-S14), which was isolated from the culture broth of a marine-derived Streptomyces strain by our group. PA-S14 binds with residue D176 in LKB1 kinase domain, and then induces LKB1 phosphorylated activation and its complex formation with MO25 and STRADα. Furthermore, PA-S14 promotes AMPK activation to enhance LC3B-II/LC3B-I ratio, trigger autophagosome formation and increase autophagic flux. PA-S14 exhibits perfect protective effects on stabilizing mitochondrial homeostasis, inhibiting tubular cell senescence, and retarding fibrogenesis in various CKD models (UUO, UIRI and adriamycin nephropathy models) and TGF-β-stimulated tubular cell culture. Transcriptomics sequencing and site-specific mutation analysis further prove that PA-S14 is a novel lead compound of LKB1 activator, which perfectly protects against renal fibrosis through inducing AMPK-mediated autophagy and mitochondrial homeostasis.

ORGANISM(S): Mus musculus

PROVIDER: GSE193072 | GEO | 2022/10/26

REPOSITORIES: GEO

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A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway [I]

Project description:AMP-activated protein kinase (AMPK) stabilizes tubular cell metabolism and protects against renal fibrosis through promoting autophagy and mitochondrial homeostasis. Liver kinase B1 (LKB1) is the key regulator for AMPK activation. However, the direct activators of LKB1 are scarce in commercial. In this study, we report a novel LKB1 activator, the piericidin analogue S14 (PA-S14), which was isolated from the culture broth of a marine-derived Streptomyces strain by our group. PA-S14 binds with residue D176 in LKB1 kinase domain, and then induces LKB1 phosphorylated activation and its complex formation with MO25 and STRADα. Furthermore, PA-S14 promotes AMPK activation to enhance LC3B-II/LC3B-I ratio, trigger autophagosome formation and increase autophagic flux. PA-S14 exhibits perfect protective effects on stabilizing mitochondrial homeostasis, inhibiting tubular cell senescence, and retarding fibrogenesis in various CKD models (UUO, UIRI and adriamycin nephropathy models) and TGF-β-stimulated tubular cell culture. Transcriptomics sequencing and site-specific mutation analysis further prove that PA-S14 is a novel lead compound of LKB1 activator, which perfectly protects against renal fibrosis through inducing AMPK-mediated autophagy and mitochondrial homeostasis.

2022-10-26 | GSE193067 | GEO

AMPK activator O304 protects against kidney aging through promoting energy metabolism and autophagy

Project description:Energy homeostasis plays a key role in retarding aging, and mitochondria are responsible for energy production.AMPK plays a central role in maintaining energy homeostasis and mitochondrial homeostasis, and commands autophagy, a clearing and recycling process to maintain cellular homeostasis. However, the effect of AMPK activators on kidney aging has not been fully elucidated. We testified the effects of O304, a novel direct AMPK activator, in naturally aging mice model and D-galactose (D-gal)-treated renal tubular cell culture. We identified that O304 perfectly protects against cellular senescence and aged-related fibrosis in kidneys. Also, O304 restored energy metabolism, promoted autophagy, and preserved mitochondrial homeostasis. Transcriptomic sequencing also proved that O304 induced fatty acid metabolism, mitochondrial biogenesis and ATP process, and downregulated cell aging, DNA damage response and collagen organization. All these results suggest that O304 has a strong potential to retard aged kidney injury through regulating AMPK-induced multiple pathways.

2022-01-27 | GSE192512 | GEO

A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway

Project description:A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway

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Gene expression profiles of Lkb1 WT and KO hematopoietic stem cells (HSCs)

Project description:LKB1 encodes a Ser/Thr kinase and acts as an evolutionarily conserved sensor of cellular energy status in eukaryotic cells. LKB1 functions as the major upstream kinase to phosphorylate AMPK and 12 other AMPK-related kinases, which is required for their activation in many cellular contexts. Once activated, AMPK and AMPK-related kinases phosphorylate a diverse array of downstream effectors to switch on ATP-generating catabolic processes and switch off ATP-consuming anabolic processes, thus restoring energy balance during periods of energetic stress. To study the role and mechanisms of Lkb1 in the regulation of hematopoietic stem cell (HSC) biology, we performed transcriptome analysis of sorted LSK (Lin-, Sca-1+, c-Kit+) cells from Lkb1 WT and KO bone marrows at 1 day post-completing tamoxifen injection (DPI). To identify more proximal molecular effects, we chose 1 DPI due to the modest phenotypes in Lkb1 KO mice, yet documentation of efficient Lkb1 deletion in LSK cells at this very early time point. We treated Lkb1 L/L rosa26CreERT2 and Lkb1 L/L mice (C57BL/Ka-CD45.2:Thy-1.1 background) with Tamoxifen for 5 days to somatically delete Lkb1 in adult mice, and generated Lkb1 WT and KO mice. At 1 DPI, we prepared single-cell suspensions from bone marrow (from femoral and tibial bones), and stained and sorted LSK populations using FACSAria (Becton Dickinson, Mountain View, CA). The RNA was extracted from sorted LSK cells, amplified and subjected to gene profiling. The samples include 3 Lkb1 WT (Lkb1 WT 5-7) and 4 Lkb1 KO (Lkb1 KO 4-7) replicates.

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IKK Promotes Cytokine-Induced and Cancer-Associated AMPK Activity and Attenuates Phenformin-Induced Cell Death in LKB1-Deficient Cells

Project description:The 5' AMP-activated protein kinase (AMPK) is a master energy sensing kinase that is regulated by phosphorylation of Thr172 in its activation loop. Three kinases can phosphorylate AMPK at Thr172: the tumor suppressor LKB1, CAMKK2 and TAK1. While LKB1- and CAMKK2-mediated AMPK Thr172 phosphorylation have been well-characterized, much less is known about TAK1-dependent AMPK phosphorylation. An important target of TAK1 is IκB kinase (IKK) which controls NF-B transcription factor activation. Here, we tested the hypothesis that IKK acted downstream of TAK1 to activate AMPK by phosphorylating Thr172. IKK was required for phosphorylation of Thr172 in AMPK in response to treatment with IL-1 or TNF- treatment or by TAK1 overexpression. Additionally, IKK regulated basal AMPK Thr172 phosphorylation in several cancer cell types independently of TAK1, indicating that other modes of IKK activation could lead to AMPK activation. We found that IKK directly phosphorylated AMPK at Thr172 independently of LKB1 or energy stress. This finding indicated that while LKB1 activates AMPK as a sensor of energetic stress, IKK activated AMPK in response to extracellular inflammatory signals and through distinct pathways downstream of IKK activation. Accordingly, in LKB1-deficient cells, IKK inhibition caused a reduction in AMPK Thr172 phosphorylation in response to the mitochondrial inhibitor phenformin. This response led to enhanced apoptosis and suggests that IKK inhibition in combination with phenformin could be used clinically to treat patients with LKB1-deficient cancers.

2018-07-16 | PXD009897 | Pride

A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway [II]

| PRJNA794724 | ENA

A new LKB1 activator, Piericidin Analogue S14, attenuates tubular cell senescence and renal fibrosis through promoting AMPK-induced autophagy and mitochondrial homeostasis pathway [I]

| PRJNA794352 | ENA

The LKB1/AMPK pathway is a central mediator of the hepatic xenobiotic response

Project description:The serine/threonine kinase LKB1 is a tumor suppressor gene which also plays key roles in metabolic function in peripheral tissues through its direct phosphorylation and activation of the AMP-activated protein kinase (AMPK). The LKB1/AMPK pathway plays key roles in the liver in suppressing transcriptional programs of gluconeogenesis and lipogenesis, and hepatic LKB1 is required for the ability of the type 2 diabetes agent metformin to lower blood glucose levels in mice. To more broadly define how the LKB1/AMPK pathway controls hepatic metabolism, transcriptional profiling was employed using mice with an inducible liver-specific deletion of Lkb1. Unexpectedly, LKB1/AMPK signaling broadly controls the expression of many phase I xenobiotic metabolism genes, including several members of the cytochrome P450 family. In particular, expression of CYP2E1, an important mediator of drug detoxification, was markedly reduced upon LKB1 loss. LKB1 liver-specific knockout mice exposed to hepatocarcinogens, exhibited marked resistance to carcinogen-induced hepatocyte apoptosis, proliferation, senescence, and liver fibrosis and tumorigenesis.

2019-05-01 | GSE21984 | GEO

Gene expression profiles of Lkb1 WT and KO hematopoietic stem cells (HSCs)

2010-12-01 | GSE24765 | GEO

LKB1 expressed in dendritic cells governs the development and expansion of thymus-derived regulatory T cells

Project description:Liver Kinase B1 (LKB1) plays a key role in cellular metabolism by controlling AMPK activation. However, its function in dendritic cell (DC) biology has not been addressed. Here, we find that LKB1 functions as a critical brake on DC immunogenicity, and when lost, leads to reduced mitochondrial fitness and increased maturation, migration, and T cell priming of peripheral DCs. Concurrently, loss of LKB1 in DCs enhances their capacity to promote output of regulatory T cells (Tregs) from the thymus, which dominates the outcome of peripheral immune responses, as suggested by increased resistance to asthma and higher susceptibility to cancer in CD11cΔLKB1 mice. Mechanistically, we find that loss of LKB1 specifically primes thymic CD11b+ DCs to facilitate thymic Treg development and expansion, which is independent from AMPK signalling, but dependent on mTOR and enhanced phospholipase C β1-driven CD86 expression. Together, our results identify LKB1 as a critical regulator of DC-driven effector T cell and Treg responses both in the periphery and the thymus.

2020-05-07 | GSE149941 | GEO

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