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Mammalian haloacid dehalogenase (HAD)-type phosphatases have evolved to dephosphorylate a wide range of small metabolites, but can also target macromolecules such as serine/threonine, tyrosine-, and histidine-phosphorylated proteins. To accomplish these tasks, HAD phosphatases are equipped with cap domains that control access to the active site and provide substrate specificity determinants. A number of capped HAD phosphatases impact protein phosphorylation, although structural data are consistent with small metabolite substrates rather than protein substrates. This review discusses the structures, functions and disease implications of the three closely related, capped HAD phosphatases pyridoxal phosphatase (PDXP or chronophin), phosphoglycolate phosphatase (PGP, also termed AUM or glycerol phosphatase) and phospholysine phosphohistidine inorganic pyrophosphate phosphatase (LHPP or HDHD2B). Evidence in support of small metabolite and protein phosphatase activity is discussed in the context of the diversity of their biological functions.
Pyridoxal 5′-phosphate (PLP) is an essential cofactor in the catalysis of ~140 different enzymatic reactions. A pharmacological elevation of cellular PLP concentrations is of interest in neuropsychiatric diseases, but whole-body consequences of higher intracellular PLP levels are unknown. To address this question, we have generated mice allowing a conditional ablation of the PLP phosphatase PDXP. Ubiquitous PDXP deletion increased PLP levels in brain, skeletal muscle and red blood cells up to 3-fold compared to control mice, demonstrating that PDXP acts as a major regulator of cellular PLP concentrations in vivo. Neurotransmitter analysis revealed that the concentrations of dopamine, serotonin, epinephrine and glutamate were unchanged in the brains of PDXP knockout mice. However, the levels of γ-aminobutyric acid (GABA) increased by ~20%, demonstrating that elevated PLP levels can drive additional GABA production. Behavioral phenotyping of PDXP knockout mice revealed improved spatial learning and memory, and a mild anxiety-like behavior. Consistent with elevated GABA levels in the brain, PDXP loss in neural cells decreased performance in motor tests, whereas PDXP-deficiency in skeletal muscle increased grip strength. Our findings suggest that PDXP is involved in the fine-tuning of GABA biosynthesis. Pharmacological inhibition of PDXP might correct the excitatory/inhibitory imbalance in some neuropsychiatric diseases.
Cancer is one of the leading causes of death worldwide. Toxic contaminants in human food or medicinal products, such as substances like pyrrolizidine alkaloids (PAs), have been thought to contribute to cancer incidence. PAs are found in many plant species as secondary metabolites, and they may affect humans through contaminated food sources, herbal medicines, and dietary supplements. Hundreds of compounds belonging to PAs have been identified, differing in their chemical structures, either in their necine base moiety or esterification at their necic acid moiety. PAs undergo hepatic metabolism, and after this process, they can induce hepatotoxicity, genotoxicity, and carcinogenicity. However, the mechanism of inducing genotoxicity and carcinogenicity is still unclear and warrants further investigation.
Therefore, the present study aims to investigate the mechanism of genotoxicity induced by selected PAs with different chemical structures in in vitro systems. Primarily, human hepatoma HepG2 cells were utilized, and in co-culture, metabolically active HepG2 cells were combined with non-metabolically active human cervical HeLa H2B-GFP cells.
First, the genotoxicity of the PAs europine, lycopsamine, retrorsine, riddelliine, seneciphylline, echimidine, and lasiocarpine was investigated in the cytokinesis-block micronucleus (CBMN) assay. All seven selected PAs caused the formation of micronuclei in a dose-dependent manner, with the maximal increase of micronucleus formation ranging from 1.64 to 2.0 fold. The lowest concentrations at which significant induction of micronuclei was found were 3.2 µM for lasiocarpine and riddelliine, 32 µM for retrorsine and echimidine, and 100 µM for seneciphylline, europine, and lycopsamine. These results confirmed previously published potency rankings in the micronucleus assay.
The same PAs, with the exception of seneciphylline, were also investigated in a crosslink-modified comet assay, and reduced tail formation after hydrogen peroxide treatment was found in all diester-type PAs. Meanwhile, an equimolar concentration of the monoesters europine and lycopsamine did not significantly reduce DNA migration. Thus, the crosslinking activity was related to the ester type.
Next, the role of metabolic enzymes and membrane transporters in PA-induced genotoxicity was assessed. Ketoconazole (CYP 450-3A4 inhibitor) prevented lasiocarpine-induced micronucleus formation completely, while furafylline (CYP 450-1A2 inhibitor) reduced lasiocarpine-induced micronucleus formation, but did not abolish it completely. This implies that the CYP 450 enzymes play an important role in PA-induced genotoxicity.
Carboxylesterase 2 enzyme (CES 2) is commonly known to be involved in the detoxification of xenobiotics. Loperamide (CES 2 inhibitor) yielded an increased formation of lasiocarpine-induced micronuclei, revealing a possible role of CES-mediated detoxification in the genotoxicity of lasiocarpine. Also, intracellular glutathione (GSH) plays an important role in the detoxification of xenobiotics or toxins in the cells. Cells which had been pretreated with L-buthionine sulfoximine (BSO) to reduce GSH content were significantly more sensitive for the induction of micronucleus formation by lasiocarpine revealing the importance of GSH in PA-induced genotoxicity.
Quinidine (Q) and nelfinavir (NFR) are OCT1 and OATP1B1 influx transporter inhibitors, respectively, which reduced micronucleus induction by lasiocarpine (only quinidine significantly), but not completely, pointing to a relevance of OCT1 for PA uptake in HepG2 cells. Verapamil (V) and benzbromarone (Bz) are MDR1 and MRP2 efflux transporter inhibitors, respectively, and they caused a slightly increased micronucleus induction by lasiocarpine (significant only for benzbromarone) thus, revealing the role of efflux transporters in PA-induced genotoxicity.
The mechanistic approach to PA-induced genotoxicity was further studied based on oxidative stress via the formation of reactive oxygen species (ROS) in HepG2 cells. Overproduction of ROS can cross-link cellular macromolecules such as DNA, leading to genomic damage. An equimolar concentration of 10 µM of lasiocarpine (open-diester PA), riddelliine (cyclic-diester PA), and europine (monoester) significantly induced ROS production, with the highest ROS generation observed after lasiocarpine treatment, followed by riddelliine and then europine. No significant increase in ROS production was found with lycopsamine (10 µM; monoester PA), even at a higher concentration (320 µM). The generation of ROS by these PAs was further analyzed for confirmation by using 5 mM of the thiol radical scavenger antioxidant N-acetyl cysteine (NAC) combined with lasiocarpine, riddelliine, or europine. This analysis yielded a significant decrease in ROS after combining NAC with lasiocarpine, riddelliine, and europine. In addition, lasiocarpine, riddelliine, and europine induced a loss of mitochondrial membrane potential, pointing to mitochondria as the source of ROS generation.
In vivo, hepatic sinusoidal epithelial cells (HSECs) are known to be damaged first by PAs after hepatic metabolization, but HSECs themselves do not express the required metabolic enzymes for activation of PAs. To mimic this situation, HepG2 cells were used to metabolically activate PA in a co-culture with HeLa H2B-GFP cells as non-metabolically active neighbours. Due to the green fluorescent GFP label the HeLa cells could be identified easily based in the co-culture. The PAs europine, riddelliine and lasiocarpine induced micronucleus formation in HepG2 cells, and in HeLa H2B-GFP cells co-cultured with HepG2 cells, but not in HeLa H2B-GFP cells cultured alone. Metabolic inhibition of CYP 450 enzymes with ketoconazole abrogated micronucleus formation induced by the same PAs tested in the co-culture. The efflux transporter inhibitors verapamil and benzbromarone reduced the micronucleus formation in the co-culture. Furthermore, mitotic disturbances as an additional genotoxic mechanism of action were observed in HepG2 cells and in HeLa H2B-GFP cells co-cultured with HepG2 cells, but not in HeLa H2B-GFP cells cultured alone. Overall, we were able to show that PAs were activated by HepG2 cells and the metabolites induced genomic damage in co-cultured non-metabolically active green HeLa cells.
Finally, in HepG2 cells as well as the co-culture, combinations of PAs lasiocarpine and riddelliine favoured an additive effect rather than synergism. Thus, this study therefore provides support that the assumption of dose-addition can be applied in the characterization of the genotoxicity risk of PAs present in a mixture.
Various experimental and computational techniques have been employed over the past decade to provide structural and thermodynamic insights into G Protein-Coupled Receptor (GPCR) dimerization. Here, we use multiple microsecond-long, coarse-grained, biased and unbiased molecular dynamics simulations (a total of ~4 milliseconds) combined with multi-ensemble Markov state models to elucidate the kinetics of homodimerization of a prototypic GPCR, the µ-opioid receptor (MOR), embedded in a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC)/cholesterol lipid bilayer. Analysis of these computations identifies kinetically distinct macrostates comprising several different short-lived dimeric configurations of either inactive or activated MOR. Calculated kinetic rates and fractions of dimers at different MOR concentrations suggest a negligible population of MOR homodimers at physiological concentrations, which is supported by acceptor photobleaching fluorescence resonance energy transfer (FRET) experiments. This study provides a rigorous, quantitative explanation for some conflicting experimental data on GPCR oligomerization.
Histone H3 serine 28 (H3S28) phosphorylation and de-repression of polycomb repressive complex (PRC)-mediated gene regulation is linked to stress conditions in mitotic and post-mitotic cells. To better understand the role of H3S28 phosphorylation in vivo, we studied a Drosophila strain with ectopic expression of constitutively-activated H3S28A, which prevents PRC2 binding at H3S28, thus mimicking H3S28 phosphorylation. H3S28A mutants showed prolonged life span and improved resistance against starvation and paraquat-induced oxidative stress. Morphological and functional analysis of heart tubes revealed smaller luminal areas and thicker walls accompanied by moderately improved cardiac function after acute stress induction. Whole-exome deep gene-sequencing from isolated heart tubes revealed phenotype-corresponding changes in longevity-promoting and myotropic genes. We also found changes in genes controlling mitochondrial biogenesis and respiration. Analysis of mitochondrial respiration from whole flies revealed improved efficacy of ATP production with reduced electron transport-chain activity. Finally, we analyzed posttranslational modification of H3S28 in an experimental heart failure model and observed increased H3S28 phosphorylation levels in HF hearts. Our data establish a critical role of H3S28 phosphorylation in vivo for life span, stress resistance, cardiac and mitochondrial function in Drosophila. These findings may pave the way for H3S28 phosphorylation as a putative target to treat stress-related disorders such as heart failure.
Increased sympathetic noradrenergic signaling is crucially involved in fear and anxiety as defensive states. MicroRNAs regulate dynamic gene expression during synaptic plasticity and genetic variation of microRNAs modulating noradrenaline transporter gene (SLC6A2) expression may thus lead to altered central and peripheral processing of fear and anxiety. In silico prediction of microRNA regulation of SLC6A2 was confirmed by luciferase reporter assays and identified hsa-miR-579-3p as a regulating microRNA. The minor (T)-allele of rs2910931 (MAFcases = 0.431, MAFcontrols = 0.368) upstream of MIR579 was associated with panic disorder in patients (pallelic = 0.004, ncases = 506, ncontrols = 506) and with higher trait anxiety in healthy individuals (pASI = 0.029, pACQ = 0.047, n = 3112). Compared to the major (A)-allele, increased promoter activity was observed in luciferase reporter assays in vitro suggesting more effective MIR579 expression and SLC6A2 repression in vivo (p = 0.041). Healthy individuals carrying at least one (T)-allele showed a brain activation pattern suggesting increased defensive responding and sympathetic noradrenergic activation in midbrain and limbic areas during the extinction of conditioned fear. Panic disorder patients carrying two (T)-alleles showed elevated heart rates in an anxiety-provoking behavioral avoidance test (F(2, 270) = 5.47, p = 0.005). Fine-tuning of noradrenaline homeostasis by a MIR579 genetic variation modulated central and peripheral sympathetic noradrenergic activation during fear processing and anxiety. This study opens new perspectives on the role of microRNAs in the etiopathogenesis of anxiety disorders, particularly their cardiovascular symptoms and comorbidities.
Dishevelled (DVL) is the key component of the Wnt signaling pathway. Currently, DVL conformational dynamics under native conditions is unknown. To overcome this limitation, we develop the Fluorescein Arsenical Hairpin Binder- (FlAsH-) based FRET in vivo approach to study DVL conformation in living cells. Using this single-cell FRET approach, we demonstrate that (i) Wnt ligands induce open DVL conformation, (ii) DVL variants that are predominantly open, show more even subcellular localization and more efficient membrane recruitment by Frizzled (FZD) and (iii) Casein kinase 1 ɛ (CK1ɛ) has a key regulatory function in DVL conformational dynamics. In silico modeling and in vitro biophysical methods explain how CK1ɛ-specific phosphorylation events control DVL conformations via modulation of the PDZ domain and its interaction with DVL C-terminus. In summary, our study describes an experimental tool for DVL conformational sampling in living cells and elucidates the essential regulatory role of CK1ɛ in DVL conformational dynamics.
In heart failure and atrial fibrillation, a persistent Na\(^+\) current (I\(_{NaL}\)) exerts detrimental effects on cellular electrophysiology and can induce arrhythmias. We have recently shown that Na\(_V\)1.8 contributes to arrhythmogenesis by inducing a I\(_{NaL}\). Genome-wide association studies indicate that mutations in the SCN10A gene (Na\(_V\)1.8) are associated with increased risk for arrhythmias, Brugada syndrome, and sudden cardiac death. However, the mediation of these Na\(_V\)1.8-related effects, whether through cardiac ganglia or cardiomyocytes, is still a subject of controversial discussion. We used CRISPR/Cas9 technology to generate homozygous atrial SCN10A-KO-iPSC-CMs. Ruptured-patch whole-cell patch-clamp was used to measure the I\(_{NaL}\) and action potential duration. Ca\(^{2+}\) measurements (Fluo 4-AM) were performed to analyze proarrhythmogenic diastolic SR Ca\(^{2+}\) leak. The I\(_{NaL}\) was significantly reduced in atrial SCN10A KO CMs as well as after specific pharmacological inhibition of Na\(_V\)1.8. No effects on atrial APD\(_{90}\) were detected in any groups. Both SCN10A KO and specific blockers of Na\(_V\)1.8 led to decreased Ca\(^{2+}\) spark frequency and a significant reduction of arrhythmogenic Ca\(^{2+}\) waves. Our experiments demonstrate that Na\(_V\)1.8 contributes to I\(_{NaL}\) formation in human atrial CMs and that Na\(_V\)1.8 inhibition modulates proarrhythmogenic triggers in human atrial CMs and therefore Na\(_V\)1.8 could be a new target for antiarrhythmic strategies.
Mutations in the mitochondrial-DNA or mitochondria related nuclear-encoded-DNA lead to various multisystemic disorders collectively termed mitochondrial diseases. One in three cases of mitochondrial disease affects the heart muscle, which is called mitochondrial cardiomyopathy (MCM) and is associated with hypertrophic, dilated, and noncompact cardiomyopathy. The heart is an organ with high energy demand, and mitochondria occupy 30%–40% of its cardiomyocyte-cell volume. Mitochondrial dysfunction leads to energy depletion and has detrimental effects on cardiac performance. However, disease development and progression in the context of mitochondrial and nuclear DNA mutations, remains incompletely understood. The system of induced pluripotent stem cell (iPSC)-derived cardiomyocytes (CM) is an excellent platform to study MCM since the unique genetic identity to their donors enables a robust recapitulation of the predicted phenotypes in a dish on a patient-specific level. Here, we focus on recent insights into MCM studied by patient-specific iPSC-CM and further discuss research gaps and advances in metabolic maturation of iPSC-CM, which is crucial for the study of mitochondrial dysfunction and to develop novel therapeutic strategies.
Vitamin B6 deficiency has been linked to cognitive impairment in human brain disorders for decades. Still, the molecular mechanisms linking vitamin B6 to these pathologies remain poorly understood, and whether vitamin B6 supplementation improves cognition is unclear as well. Pyridoxal phosphatase (PDXP), an enzyme that controls levels of pyridoxal 5’-phosphate (PLP), the co-enzymatically active form of vitamin B6, may represent an alternative therapeutic entry point into vitamin B6-associated pathologies. However, pharmacological PDXP inhibitors to test this concept are lacking. We now identify a PDXP and age-dependent decline of PLP levels in the murine hippocampus that provides a rationale for the development of PDXP inhibitors. Using a combination of small molecule screening, protein crystallography and biolayer interferometry, we discover and analyze 7,8-dihydroxyflavone (7,8-DHF) as a direct and potent PDXP inhibitor. 7,8-DHF binds and reversibly inhibits PDXP with low micromolar affinity and sub-micromolar potency. In mouse hippocampal neurons, 7,8-DHF increases PLP in a PDXP-dependent manner. These findings validate PDXP as a druggable target. Of note, 7,8-DHF is a well-studied molecule in brain disorder models, although its mechanism of action is actively debated. Our discovery of 7,8-DHF as a PDXP inhibitor offers novel mechanistic insights into the controversy surrounding 7,8-DHF-mediated effects in the brain.