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Jiang L, Wang Q, Kang ZH, Wen JX, Yang YB, Lu XJ, Guo W, Zhao D. Novel Environmentally Friendly RNAi Biopesticides: Targeting V-ATPase in Holotrichia parallela Larvae Using Layered Double Hydroxide Nanocomplexes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:11381-11391. [PMID: 38728113 DOI: 10.1021/acs.jafc.4c00084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
RNA interference (RNAi)-based biopesticides offer an attractive avenue for pest control. Previous studies revealed high RNAi sensitivity in Holotrichia parallela larvae, showcasing its potential for grub control. In this study, we aimed to develop an environmentally friendly RNAi method for H. parallela larvae. The double-stranded RNA (dsRNA) of the V-ATPase-a gene (HpVAA) was loaded onto layered double hydroxide (LDH). The dsRNA/LDH nanocomplex exhibited increased environmental stability, and we investigated the absorption rate and permeability of dsRNA-nanoparticle complexes and explored the RNAi controlling effect. Silencing the HpVAA gene was found to darken the epidermis of H. parallela larvae, with growth cessation or death or mortality, disrupting the epidermis and midgut structure. Quantitative reverse transcription-polymerase chain reaction and confocal microscopy confirmed the effective absorption of the dsRNA/LDH nanocomplex by peanut plants, with distribution in roots, stems, and leaves. Nanomaterial-mediated RNAi silenced the target genes, leading to the death of pests. Therefore, these findings indicate the successful application of the nanomaterial-mediated RNAi system for underground pests, thus establishing a theoretical foundation for developing a green, safe, and efficient pest control strategy.
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Affiliation(s)
- Li Jiang
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Qian Wang
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Zhan-Hai Kang
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Jing-Xin Wen
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Yu-Bo Yang
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Xiu-Jun Lu
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
| | - Wei Guo
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100091, China
| | - Dan Zhao
- College of Plant Protection, Hebei Agricultural University, Baoding, Hebei 071001, China
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Li B, Lan S, Liu XR, Ji JJ, He YY, Zhang DM, Xu J, Sun H, Shi Z, Wang J, Tian Y. ATP6V1A variants are associated with childhood epilepsy with favorable outcome. Seizure 2024; 116:81-86. [PMID: 37574426 DOI: 10.1016/j.seizure.2023.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 08/03/2023] [Accepted: 08/06/2023] [Indexed: 08/15/2023] Open
Abstract
PURPOSE ATP6V1A variants have been identified in patients with highly variable phenotypes such as autosomal dominant epileptic encephalopathy and autosomal recessive cutis laxa. However, the mechanism underlying phenotype variation is unknown. We screened ATP6V1A variants in patients with epilepsy and analyzed the genotype-phenotype correlation to explain the mechanism underlying phenotypic variations. METHODS We performed trio-based whole-exome sequencing in people with epilepsy without acquired causes. All previously reported ATP6V1A variants were systematically retrieved from the HGMD and PubMed databases. RESULTS Three novel de novo ATP6V1A variants, including c.749G>C/p.Gly250Ala, c.782A>G/p.Gln261Arg, and c.1103T>C/p.Met368Thr, were identified in three unrelated cases with childhood focal (partial) epilepsy. None of the variants were listed in any public population database and evaluated as likely pathogenic according to the criteria of the American College of Medical Genetics and Genomics (ACMG). All persons showed good responses to anti-seizure medication and psychomotor development was normal. Further analysis showed that monoallelic missense variants were associated with epilepsy with variable severity, whereas biallelic variants resulted in developmental abnormalities of multisystem that may result in early lethality. CONCLUSION Childhood focal epilepsy with favorable outcome was probably a novel phenotype of ATP6V1A. ATP6V1A variants are associated with a range of phenotypes that correlate with genotypes. The relationship between phenotype severity and the genotype (genetic impairment) of ATP6V1A variants helps explain the phenotypic variations.
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Affiliation(s)
- Bin Li
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Song Lan
- Department of Neurology, Maoming People's Hospital, Maoming, China
| | - Xiao-Rong Liu
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Jing-Jing Ji
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Yun-Yan He
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Dong-Ming Zhang
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Jie Xu
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China
| | - Hui Sun
- Department of Neurology, the First Affiliated Hospital of Guangzhou Medical University
| | - Zhen Shi
- Department of Neurology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou, China
| | - Jie Wang
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China.
| | - Yang Tian
- Institute of Neuroscience and Department of Neurology of the Second Affiliated Hospital of Guangzhou Medical University, Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China, Guangzhou, China; Department of Neurology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou, China.
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Qiu S, Zhao W, Gao X, Li D, Wang W, Gao B, Han W, Yang S, Dai P, Cao P, Yuan Y. Syndromic Deafness Gene ATP6V1B2 Controls Degeneration of Spiral Ganglion Neurons Through Modulating Proton Flux. Front Cell Dev Biol 2021; 9:742714. [PMID: 34746137 PMCID: PMC8568048 DOI: 10.3389/fcell.2021.742714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/28/2021] [Indexed: 11/13/2022] Open
Abstract
ATP6V1B2 encodes the V1B2 subunit in V-ATPase, a proton pump responsible for the acidification of lysosomes. Mutations in this gene cause DDOD syndrome, DOORS syndrome, and Zimmermann-Laband syndrome, which share overlapping feature of congenital sensorineural deafness, onychodystrophy, and different extents of intellectual disability without or with epilepsy. However, the underlying mechanisms remain unclear. To investigate the pathological role of mutant ATP6V1B2 in the auditory system, we evaluated auditory brainstem response, distortion product otoacoustic emissions, in a transgenic line of mice carrying c.1516 C > T (p.Arg506∗) in Atp6v1b2, Atp6v1b2 Arg506*/Arg506* . To explore the pathogenic mechanism of neurodegeneration in the auditory pathway, immunostaining, western blotting, and RNAscope analyses were performed in Atp6v1b2Arg506*/Arg506* mice. The Atp6v1b2Arg506*/Arg506* mice showed hidden hearing loss (HHL) at early stages and developed late-onset hearing loss. We observed increased transcription of Atp6v1b1 in hair cells of Atp6v1b2Arg506*/Arg506* mice and inferred that Atp6v1b1 compensated for the Atp6v1b2 dysfunction by increasing its own transcription level. Genetic compensation in hair cells explains the milder hearing impairment in Atp6v1b2Arg506*/Arg506* mice. Apoptosis activated by lysosomal dysfunction and the subsequent blockade of autophagic flux induced the degeneration of spiral ganglion neurons and further impaired the hearing. Intraperitoneal administration of the apoptosis inhibitor, BIP-V5, improved both phenotypical and pathological outcomes in two live mutant mice. Based on the pathogenesis underlying hearing loss in Atp6v1b2-related syndromes, systemic drug administration to inhibit apoptosis might be an option for restoring the function of spiral ganglion neurons and promoting hearing, which provides a direction for future treatment.
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Affiliation(s)
- Shiwei Qiu
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China.,The Institute of Audiology and Balance Science, Artificial Auditory Laboratory of Jiangsu Province, Xuzhou Medical University, Xuzhou, China
| | - Weihao Zhao
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China.,Department of Otolaryngology General Hospital of Tibet Military Region, Lhasa, China
| | - Xue Gao
- Department of Otolaryngology, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Dapeng Li
- Department of Neurobiology, School of Basic Medical Sciences, Beijing Key Laboratory of Neural Regeneration and Repair, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Weiqian Wang
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Bo Gao
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Weiju Han
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Shiming Yang
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Pu Dai
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Peng Cao
- National Institute of Biological Sciences, Beijing, China
| | - Yongyi Yuan
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Genetic Testing Center for Deafness, Chinese PLA General Hospital; National Clinical Research Center for Otolaryngologic Diseases; Key Lab of Hearing Impairment Science of Ministry of Education; Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
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Wang C, Xiang Y, Qian D. Current progress in plant V-ATPase: From biochemical properties to physiological functions. JOURNAL OF PLANT PHYSIOLOGY 2021; 266:153525. [PMID: 34560396 DOI: 10.1016/j.jplph.2021.153525] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 09/12/2021] [Accepted: 09/12/2021] [Indexed: 06/13/2023]
Abstract
Vacuolar-type adenosine triphosphatase (V-ATPase, VHA) is a highly conserved, ATP-driven multisubunit proton pump that is widely distributed in all eukaryotic cells. V-ATPase consists of two domains formed by at least 13 different subunits, the membrane peripheral V1 domain responsible for ATP hydrolysis, and the membrane-integral V0 domain responsible for proton translocation. V-ATPase plays an essential role in energizing secondary active transport and is indispensable to plants. In addition to multiple stress responses, plant V-ATPase is also implicated in physiological processes such as growth, development, and morphogenesis. Based on the identification of distinct V-ATPase mutants and advances in luminal pH measurements in vivo, it has been revealed that this holoenzyme complex plays a pivotal role in pH homeostasis of the plant endomembrane system and endocytic and secretory trafficking. Here, we review recent progress in comprehending the biochemical properties and physiological functions of plant V-ATPase and explore the topics that require further elucidation.
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Affiliation(s)
- Chao Wang
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Yun Xiang
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Dong Qian
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China.
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Urbanavičiūtė I, Bonfiglioli L, Pagnotta MA. One Hundred Candidate Genes and Their Roles in Drought and Salt Tolerance in Wheat. Int J Mol Sci 2021; 22:ijms22126378. [PMID: 34203629 PMCID: PMC8232269 DOI: 10.3390/ijms22126378] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/03/2021] [Accepted: 06/09/2021] [Indexed: 12/31/2022] Open
Abstract
Drought and salinity are major constraints to agriculture. In this review, we present an overview of the global situation and the consequences of drought and salt stress connected to climatic changes. We provide a list of possible genetic resources as sources of resistance or tolerant traits, together with the previous studies that focused on transferring genes from the germplasm to cultivated varieties. We explained the morphological and physiological aspects connected to hydric stresses, described the mechanisms that induce tolerance, and discussed the results of the main studies. Finally, we described more than 100 genes associated with tolerance to hydric stresses in the Triticeae. These were divided in agreement with their main function into osmotic adjustment and ionic and redox homeostasis. The understanding of a given gene function and expression pattern according to hydric stress is particularly important for the efficient selection of new tolerant genotypes in classical breeding. For this reason, the current review provides a crucial reference for future studies on the mechanism involved in hydric stress tolerance and the use of these genes in mark assistance selection (MAS) to select the wheat germplasm to face the climatic changes.
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Zhou H, Huang W, Luo S, Hu H, Zhang Y, Zhang L, Li P. Genome-Wide Identification of the Vacuolar H +-ATPase Gene Family in Five Rosaceae Species and Expression Analysis in Pear ( Pyrus bretschneideri). PLANTS (BASEL, SWITZERLAND) 2020; 9:plants9121661. [PMID: 33261053 PMCID: PMC7761284 DOI: 10.3390/plants9121661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/22/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
Vacuolar H+-ATPases (V-ATPase) are multi-subunit complexes that function as ATP hydrolysis-driven proton pumps. They play pivotal roles in physiological processes, such as development, metabolism, stress, and growth. However, there have been very few studies on the characterisation of V-ATPase (VHA) genes in Rosaceae species. Therefore, in the present study, we performed a genome-wide analysis and identified VHA gene family members in five Rosaceae species (Pyrus bretschneideri, Malus domestica, Prunus persica, Fragaria vesca, and Prunus mume). A total of 159 VHA genes were identified, and were classified into 13 subfamilies according to the phylogenetic analysis. The structure of VHA proteins revealed high similarity among different VHA genes within the same subgroup. Gene duplication event analysis revealed that whole-genome duplications represented the major pathway for expansion of the Pyrus bretschneideri VHA genes (PbrVHA genes). The tissue-specific expression analysis of the pear showed that 36 PbrVHA genes were expressed in major tissues. Seven PbrVHA genes were significantly downregulated when the pollen tube growth stopped. Moreover, many PbrVHA genes were differentially expressed during fruit development and storage, suggesting that VHA genes play specific roles in development and senescence. The present study provides fundamental information for further elucidating the potential roles of VHA genes during development and senescence.
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Affiliation(s)
- Hongsheng Zhou
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
- Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Nanjing 210014, China
| | - Wen Huang
- Nanjing Institute of Vegetable Science, Nanjing 210042, China;
| | - Shufen Luo
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
| | - Huali Hu
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
| | - Yingtong Zhang
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
| | - Leigang Zhang
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Pengxia Li
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (H.Z.); (S.L.); (H.H.); (Y.Z.)
- Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Nanjing 210014, China
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
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Wang X, Bove AM, Simone G, Ma B. Molecular Bases of VEGFR-2-Mediated Physiological Function and Pathological Role. Front Cell Dev Biol 2020; 8:599281. [PMID: 33304904 PMCID: PMC7701214 DOI: 10.3389/fcell.2020.599281] [Citation(s) in RCA: 126] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/21/2020] [Indexed: 12/16/2022] Open
Abstract
The vascular endothelial growth factors (VEGFs) and their receptors (VEGFRs) play crucial roles in vasculogenesis and angiogenesis. Angiogenesis is an important mechanism in many physiological and pathological processes, and is involved in endothelial cell proliferation, migration, and survival, then leads to further tubulogenesis, and finally promotes formation of vessels. This series of signaling cascade pathways are precisely mediated by VEGF/VEGFR-2 system. The VEGF binding to the IgD2 and IgD3 of VEGFR-2 induces the dimerization of the receptor, subsequently the activation and trans-autophosphorylation of the tyrosine kinase, and then the initiation of the intracellular signaling cascades. Finally the VEGF-activated VEGFR-2 stimulates and mediates variety of signaling transduction, biological responses, and pathological processes in angiogenesis. Several crucial phosphorylated sites Tyr801, Try951, Try1175, and Try1214 in the VEGFR-2 intracellular domains mediate several key signaling processes including PLCγ-PKC, TSAd-Src-PI3K-Akt, SHB-FAK-paxillin, SHB-PI3K-Akt, and NCK-p38-MAPKAPK2/3 pathways. Based on the molecular structure and signaling pathways of VEGFR-2, the strategy of the VEGFR-2-targeted therapy should be considered to employ in the treatment of the VEGF/VEGFR-2-associated diseases by blocking the VEGF/VEGFR-2 signaling pathway, inhibiting VEGF and VEGFR-2 gene expression, blocking the binding of VEGF and VEGFR-2, and preventing the proliferation, migration, and survival of vascular endothelial cells expressing VEGFR-2.
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Affiliation(s)
- Xinrong Wang
- College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, China
| | | | | | - Binyun Ma
- Department of Medicine/Hematology, Keck School of Medicine of the University of Southern California, Los Angeles, CA, United States
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Wang S, Wong LY, Neumann D, Liu Y, Sun A, Antoons G, Strzelecka A, Glatz JF, Nabben M, Luiken JJ. Augmenting Vacuolar H +-ATPase Function Prevents Cardiomyocytes from Lipid-Overload Induced Dysfunction. Int J Mol Sci 2020; 21:ijms21041520. [PMID: 32102213 PMCID: PMC7073192 DOI: 10.3390/ijms21041520] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/17/2020] [Accepted: 02/21/2020] [Indexed: 12/14/2022] Open
Abstract
The diabetic heart is characterized by a shift in substrate utilization from glucose to lipids, which may ultimately lead to contractile dysfunction. This substrate shift is facilitated by increased translocation of lipid transporter CD36 (SR-B2) from endosomes to the sarcolemma resulting in increased lipid uptake. We previously showed that endosomal retention of CD36 is dependent on the proper functioning of vacuolar H+-ATPase (v-ATPase). Excess lipids trigger CD36 translocation through inhibition of v-ATPase function. Conversely, in yeast, glucose availability is known to enhance v-ATPase function, allowing us to hypothesize that glucose availability, via v-ATPase, may internalize CD36 and restore contractile function in lipid-overloaded cardiomyocytes. Increased glucose availability was achieved through (a) high glucose (25 mM) addition to the culture medium or (b) adenoviral overexpression of protein kinase-D1 (a kinase mediating GLUT4 translocation). In HL-1 cardiomyocytes, adult rat and human cardiomyocytes cultured under high-lipid conditions, each treatment stimulated v-ATPase re-assembly, endosomal acidification, endosomal CD36 retention and prevented myocellular lipid accumulation. Additionally, these treatments preserved insulin-stimulated GLUT4 translocation and glucose uptake as well as contractile force. The present findings reveal v-ATPase functions as a key regulator of cardiomyocyte substrate preference and as a novel potential treatment approach for the diabetic heart.
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Affiliation(s)
- Shujin Wang
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
| | - Li-Yen Wong
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
- Department of Clinical Genetics, Maastricht University Medical Center+, 6200-MD Maastricht, The Netherlands
| | - Dietbert Neumann
- Departments of Pathology, CARIM School for Cardiovascular Diseases, Maastricht University, 6200-MD Maastricht, The Netherlands;
| | - Yilin Liu
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
| | - Aomin Sun
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
| | - Gudrun Antoons
- Departments of Physiology, CARIM School for Cardiovascular Diseases, Maastricht University, 6200-MD Maastricht, The Netherlands;
| | - Agnieszka Strzelecka
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
| | - Jan F.C. Glatz
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
- Department of Clinical Genetics, Maastricht University Medical Center+, 6200-MD Maastricht, The Netherlands
| | - Miranda Nabben
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
| | - Joost J.F.P. Luiken
- Department of Genetics & Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University, 6200-MD Maastricht, The Netherlands; (S.W.); (L.-Y.W.); (Y.L.); (A.S.); (A.S.); (M.N.)
- Correspondence: ; Tel.: +31-43 3881209
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Saddala MS, Lennikov A, Bouras A, Huang H. RNA-Seq reveals differential expression profiles and functional annotation of genes involved in retinal degeneration in Pde6c mutant Danio rerio. BMC Genomics 2020; 21:132. [PMID: 32033529 PMCID: PMC7006399 DOI: 10.1186/s12864-020-6550-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 01/31/2020] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Retinal degenerative diseases affect millions of people and represent the leading cause of vision loss around the world. Retinal degeneration has been attributed to a wide variety of causes, such as disruption of genes involved in phototransduction, biosynthesis, folding of the rhodopsin molecule, and the structural support of the retina. The molecular pathogenesis of the biological events in retinal degeneration is unclear; however, the molecular basis of the retinal pathological defect can be potentially determined by gene-expression profiling of the whole retina. In the present study, we analyzed the differential gene expression profile of the retina from a wild-type zebrafish and phosphodiesterase 6c (pde6c) mutant. RESULTS The datasets were downloaded from the Sequence Read Archive (SRA), and adaptors and unbiased bases were removed, and sequences were checked to ensure the quality. The reads were further aligned to the reference genome of zebrafish, and the gene expression was calculated. The differentially expressed genes (DEGs) were filtered based on the log fold change (logFC) (±4) and p-values (p < 0.001). We performed gene annotation (molecular function [MF], biological process [BP], cellular component [CC]), and determined the functional pathways Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway for the DEGs. Our result showed 216 upregulated and 3527 downregulated genes between normal and pde6c mutant zebrafish. These DEGs are involved in various KEGG pathways, such as the phototransduction (12 genes), mRNA surveillance (17 genes), phagosome (25 genes), glycolysis/gluconeogenesis (15 genes), adrenergic signaling in cardiomyocytes (29 genes), ribosome (20 genes), the citrate cycle (TCA cycle; 8 genes), insulin signaling (24 genes), oxidative phosphorylation (20 genes), and RNA transport (22 genes) pathways. Many more of all the pathway genes were down-regulated, while fewer were up-regulated in the retina of pde6c mutant zebrafish. CONCLUSIONS Our data strongly indicate that, among these genes, the above-mentioned pathways' genes as well as calcium-binding, neural damage, peptidase, immunological, and apoptosis proteins are mostly involved in the retinal and neural degeneration that cause abnormalities in photoreceptors or retinal pigment epithelium (RPE) cells.
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Affiliation(s)
- Madhu Sudhana Saddala
- School of Medicine, Department Ophthalmology, Mason Eye Institute, University of Missouri-Columbia, One Hospital Drive, MA102C, Columbia, MO, 65212, USA
- Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Anton Lennikov
- School of Medicine, Department Ophthalmology, Mason Eye Institute, University of Missouri-Columbia, One Hospital Drive, MA102C, Columbia, MO, 65212, USA
- Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA
| | - Adam Bouras
- School of Medicine, Department Ophthalmology, Mason Eye Institute, University of Missouri-Columbia, One Hospital Drive, MA102C, Columbia, MO, 65212, USA
| | - Hu Huang
- School of Medicine, Department Ophthalmology, Mason Eye Institute, University of Missouri-Columbia, One Hospital Drive, MA102C, Columbia, MO, 65212, USA.
- Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USA.
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10
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The Inhibitory Effect of Celangulin V on the ATP Hydrolytic Activity of the Complex of V-ATPase Subunits A and B in the Midgut of Mythimna separata. Toxins (Basel) 2019; 11:toxins11020130. [PMID: 30813232 PMCID: PMC6409644 DOI: 10.3390/toxins11020130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 02/16/2019] [Accepted: 02/18/2019] [Indexed: 11/17/2022] Open
Abstract
Celangulin V (CV) is a compound isolated from Celastrus angulatus Max that has a toxic activity against agricultural insect pests. CV can bind to subunits a, H, and B of the vacuolar ATPase (V-ATPase) in the midgut epithelial cells of insects. However, the mechanism of action of CV is still unclear. In this study, the soluble complex of the V-ATPase A subunit mutant TSCA which avoids the feedback inhibition by the hydrolysate ADP and V-ATPase B subunit were obtained and then purified using affinity chromatography. The H⁺K⁺-ATPase activity of the complex and the inhibitory activity of CV on ATP hydrolysis were determined. The results suggest that CV inhibits the ATP hydrolysis, resulting in an insecticidal effect. Additionally, the homology modeling of the AB complex and molecular docking results indicate that CV can competitively bind to the AB complex at the ATP binding site, which inhibits ATP hydrolysis. These findings suggest that the AB subunits complex is one of the potential targets for CV and is important for understanding the mechanism of interaction between CV and V-ATPase.
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11
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Ip YK, Hiong KC, Lim LJ, Choo CY, Boo MV, Wong WP, Neo ML, Chew SF. Molecular characterization, light-dependent expression, and cellular localization of a host vacuolar-type H + -ATPase (VHA) subunit A in the giant clam, Tridacna squamosa , indicate the involvement of the host VHA in the uptake of inorganic carbon and its supply to the symbiotic zooxanthellae. Gene 2018; 659:137-148. [DOI: 10.1016/j.gene.2018.03.054] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 03/13/2018] [Accepted: 03/16/2018] [Indexed: 10/17/2022]
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12
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Lv S, Jiang P, Tai F, Wang D, Feng J, Fan P, Bao H, Li Y. The V-ATPase subunit A is essential for salt tolerance through participating in vacuolar Na + compartmentalization in Salicornia europaea. PLANTA 2017; 246:1177-1187. [PMID: 28825133 DOI: 10.1007/s00425-017-2762-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 08/15/2017] [Indexed: 05/25/2023]
Abstract
The V-ATPase subunit A participates in vacuolar Na + compartmentalization in Salicornia europaea regulating V-ATPase and V-PPase activities. Na+ sequestration into the vacuole is an efficient strategy in response to salinity in many halophytes. However, it is not yet fully understood how this process is achieved. Particularly, the role of vacuolar H+-ATPase (V-ATPase) in this process is controversial. Our previous proteomic investigation in the euhalophyte Salicornia europaea L. found a significant increase of the abundance of V-ATPase subunit A under salinity. Here, the gene encoding this subunit named SeVHA-A was characterized, and its role in salt tolerance was demonstrated by RNAi directed downregulation in suspension-cultured cells of S. europaea. The transcripts of genes encoding vacuolar H+-PPase (V-PPase) and vacuolar Na+/H+ antiporter (SeNHX1) also decreased significantly in the RNAi cells. Knockdown of SeVHA-A resulted in a reduction in both V-ATPase and vacuolar H+-PPase (V-PPase) activities. Accordingly, the SeVHA-A-RNAi cells showed increased vacuolar pH and decreased cell viability under different NaCl concentrations. Further Na+ staining showed the reduced vacuolar Na+ sequestration in RNAi cells. Taken together, our results evidenced that SeVHA-A participates in vacuolar Na+ sequestration regulating V-ATPase and V-PPase activities and thereby vacuolar pH in S. europaea. The possible mechanisms underlying the reduction of vacuolar V-PPase activity in SeVHA-A-RNAi cells were also discussed.
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Affiliation(s)
- Sulian Lv
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Ping Jiang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Fang Tai
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Duoliya Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Juanjuan Feng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Pengxiang Fan
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Hexigeduleng Bao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Yinxin Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China.
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13
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Liu Y, Steinbusch LKM, Nabben M, Kapsokalyvas D, van Zandvoort M, Schönleitner P, Antoons G, Simons PJ, Coumans WA, Geomini A, Chanda D, Glatz JFC, Neumann D, Luiken JJFP. Palmitate-Induced Vacuolar-Type H +-ATPase Inhibition Feeds Forward Into Insulin Resistance and Contractile Dysfunction. Diabetes 2017; 66:1521-1534. [PMID: 28302654 DOI: 10.2337/db16-0727] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 03/13/2017] [Indexed: 11/13/2022]
Abstract
Dietary fat overconsumption leads to myocardial lipid accumulation through mechanisms that are incompletely resolved. Previously, we identified increased translocation of the fatty acid transporter CD36 from its endosomal storage compartment to the sarcolemma as the primary mechanism of excessive myocellular lipid import. Here, we show that increased CD36 translocation is caused by alkalinization of endosomes resulting from inhibition of proton pumping activity of vacuolar-type H+-ATPase (v-ATPase). Endosomal alkalinization was observed in hearts from rats fed a lard-based high-fat diet and in rodent and human cardiomyocytes upon palmitate overexposure, and appeared as an early lipid-induced event preceding the onset of insulin resistance. Either genetic or pharmacological inhibition of v-ATPase in cardiomyocytes exposed to low palmitate concentrations reduced insulin sensitivity and cardiomyocyte contractility, which was rescued by CD36 silencing. The mechanism of palmitate-induced v-ATPase inhibition involved its dissociation into two parts: the cytosolic V1 and the integral membrane V0 subcomplex. Interestingly, oleate also inhibits v-ATPase function, yielding triacylglycerol accumulation but not insulin resistance. In conclusion, lipid oversupply increases CD36-mediated lipid uptake that directly impairs v-ATPase function. This feeds forward to enhanced CD36 translocation and further increased lipid uptake. In the case of palmitate, its accelerated uptake ultimately precipitates into cardiac insulin resistance and contractile dysfunction.
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Affiliation(s)
- Yilin Liu
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Laura K M Steinbusch
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Miranda Nabben
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Dimitris Kapsokalyvas
- Department of Molecular Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Marc van Zandvoort
- Department of Molecular Cell Biology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Patrick Schönleitner
- Department of Physiology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Gudrun Antoons
- Department of Physiology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | | | - Will A Coumans
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Amber Geomini
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Dipanjan Chanda
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Jan F C Glatz
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Dietbert Neumann
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
| | - Joost J F P Luiken
- Department of Molecular Genetics, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
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14
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Tsukuba T, Sakai E, Nishishita K, Kadowaki T, Okamoto K. New functions of lysosomes in bone cells. J Oral Biosci 2017. [DOI: 10.1016/j.job.2017.01.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Granja S, Tavares-Valente D, Queirós O, Baltazar F. Value of pH regulators in the diagnosis, prognosis and treatment of cancer. Semin Cancer Biol 2017; 43:17-34. [PMID: 28065864 DOI: 10.1016/j.semcancer.2016.12.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 12/15/2016] [Accepted: 12/29/2016] [Indexed: 02/07/2023]
Abstract
Altered metabolism, associated with acidification of the extracellular milieu, is one of the major features of cancer. As pH regulation is crucial for the maintenance of all biological functions, cancer cells rely on the activity of lactate exporters and proton transporters to regulate their intracellular pH. The major players in cancer pH regulation are proton pump ATPases, sodium-proton exchangers (NHEs), monocarboxylate transporters (MCTs), carbonic anhydrases (CAs) and anion exchangers (AEs), which have been shown to be upregulated in several human malignancies. Thanks to the activity of the proton pumps and transporters, tumours acidify their microenvironment, becoming more aggressive and resistant to therapy. Thus, targeting tumour pH may contribute to more effective anticancer strategies for controlling tumour progression and therapeutic resistance. In the present study, we review the role of the main pH regulators expressed in human cancer cells, including their diagnostic and prognostic value, as well as their usefulness as therapeutic targets.
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Affiliation(s)
- Sara Granja
- Life and Health Sciences Research Institute (ICVS)/School of Medicine/University of Minho, Campus de Gualtar, Braga, 4710-057, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Diana Tavares-Valente
- Life and Health Sciences Research Institute (ICVS)/School of Medicine/University of Minho, Campus de Gualtar, Braga, 4710-057, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal; IINFACTS - Institute of Research and Advanced Training in Health Sciences and Technologies, Department of Sciences, University Institute of Health Sciences (IUCS), CESPU, CRL, Gandra, Portugal
| | - Odília Queirós
- IINFACTS - Institute of Research and Advanced Training in Health Sciences and Technologies, Department of Sciences, University Institute of Health Sciences (IUCS), CESPU, CRL, Gandra, Portugal; CBMA - Center of Molecular and Environmental Biology/Department of Biology/University of Minho, Campus de Gualtar, Braga, 4710-057, Portugal
| | - Fátima Baltazar
- Life and Health Sciences Research Institute (ICVS)/School of Medicine/University of Minho, Campus de Gualtar, Braga, 4710-057, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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16
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Molloy EM, Tietz JI, Blair PM, Mitchell DA. Biological characterization of the hygrobafilomycin antibiotic JBIR-100 and bioinformatic insights into the hygrolide family of natural products. Bioorg Med Chem 2016; 24:6276-6290. [PMID: 27234886 PMCID: PMC5108699 DOI: 10.1016/j.bmc.2016.05.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/08/2016] [Accepted: 05/13/2016] [Indexed: 01/04/2023]
Abstract
The hygrolides, a family of 16-member-ring-containing plecomacrolides produced by Actinobacteria, exhibit numerous reported bioactivities. Using HR-MS/MS, nucleophilic 1,4-addition-based labeling, NMR, and bioinformatic analysis, we identified Streptomyces varsoviensis as a novel producer of JBIR-100, a fumarate-containing hygrolide, and elucidated the previously unknown stereochemistry of the natural product. We investigated the antimicrobial activity of JBIR-100, with preliminary insight into mode of action indicating that it perturbs the membrane of Bacillus subtilis. S. varsoviensis is known to produce compounds from multiple hygrolide sub-families, namely hygrobafilomycins (JBIR-100 and hygrobafilomycin) and bafilomycins (bafilomycin C1 and D). In light of this, we identified the biosynthetic gene cluster for JBIR-100, which, to our knowledge, represents the first reported for a hygrobafilomycin. Finally, we performed a bioinformatic analysis of the hygrolide family, describing clusters from known and predicted producers. Our results indicate that potential remains for the Actinobacteria to yield novel hygrolide congeners, perhaps with differing biological activities.
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Affiliation(s)
- Evelyn M Molloy
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Jonathan I Tietz
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Patricia M Blair
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Douglas A Mitchell
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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17
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Metabolic Adaptations of Intracellullar Bacterial Pathogens and their Mammalian Host Cells during Infection ("Pathometabolism"). Microbiol Spectr 2016; 3. [PMID: 26185075 DOI: 10.1128/microbiolspec.mbp-0002-2014] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Several bacterial pathogens that cause severe infections in warm-blooded animals, including humans, have the potential to actively invade host cells and to efficiently replicate either in the cytosol or in specialized vacuoles of the mammalian cells. The interaction between these intracellular bacterial pathogens and the host cells always leads to multiple physiological changes in both interacting partners, including complex metabolic adaptation reactions aimed to promote proliferation of the pathogen within different compartments of the host cells. In this chapter, we discuss the necessary nutrients and metabolic pathways used by some selected cytosolic and vacuolar intracellular pathogens and--when available--the links between the intracellular bacterial metabolism and the expression of the virulence genes required for the intracellular bacterial replication cycle. Furthermore, we address the growing evidence that pathogen-specific factors may also trigger metabolic responses of the infected mammalian cells affecting the carbon and nitrogen metabolism as well as defense reactions. We also point out that many studies on the metabolic host cell responses induced by the pathogens have to be scrutinized due to the use of established cell lines as model host cells, as these cells are (in the majority) cancer cells that exhibit a dysregulated primary carbon metabolism. As the exact knowledge of the metabolic host cell responses may also provide new concepts for antibacterial therapies, there is undoubtedly an urgent need for host cell models that more closely reflect the in vivo infection conditions.
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18
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Liu J, Ji Y, Zhou J, Xing D. Phosphatidylinositol 3-Kinase Promotes Activation and Vacuolar Acidification and Delays Methyl Jasmonate-Induced Leaf Senescence. PLANT PHYSIOLOGY 2016; 170:1714-31. [PMID: 26739232 PMCID: PMC4775102 DOI: 10.1104/pp.15.00744] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 01/05/2016] [Indexed: 05/09/2023]
Abstract
PI3K and its product PI3P are both involved in plant development and stress responses. In this study, the down-regulation of PI3K activity accelerated leaf senescence induced by methyl jasmonate (MeJA) and suppressed the activation of vacuolar H(+)-ATPase (V-ATPase). Yeast two-hybrid analyses indicated that PI3K bound to the V-ATPase B subunit (VHA-B). Analysis of bimolecular fluorescence complementation in tobacco guard cells showed that PI3K interacted with VHA-B2 in the tonoplasts. Through the use of pharmacological and genetic tools, we found that PI3K and V-ATPase promoted vacuolar acidification and stomatal closure during leaf senescence. Vacuolar acidification was suppressed by the PIKfyve inhibitor in 35S:AtVPS34-YFP Arabidopsis during MeJA-induced leaf senescence, but the decrease was lower than that in YFP-labeled Arabidopsis. These results suggest that PI3K promotes V-ATPase activation and consequently induces vacuolar acidification and stomatal closure, thereby delaying MeJA-induced leaf senescence.
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Affiliation(s)
- Jian Liu
- MOE Key Laboratory of Laser Life Science, and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China (J.L., Y.J., J.Z., D. X.)
| | - Yingbin Ji
- MOE Key Laboratory of Laser Life Science, and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China (J.L., Y.J., J.Z., D. X.)
| | - Jun Zhou
- MOE Key Laboratory of Laser Life Science, and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China (J.L., Y.J., J.Z., D. X.)
| | - Da Xing
- MOE Key Laboratory of Laser Life Science, and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China (J.L., Y.J., J.Z., D. X.).
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19
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Nakadera E, Yamashina S, Izumi K, Inami Y, Sato T, Fukushima H, Kon K, Ikejima K, Ueno T, Watanabe S. Inhibition of mTOR improves the impairment of acidification in autophagic vesicles caused by hepatic steatosis. Biochem Biophys Res Commun 2015; 469:1104-10. [PMID: 26687947 DOI: 10.1016/j.bbrc.2015.12.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/03/2015] [Indexed: 11/27/2022]
Abstract
Recent investigations revealed that dysfunction of autophagy involved in the progression of chronic liver diseases such as alcoholic and nonalcoholic steatohepatitis and hepatocellular neoplasia. Previously, it was reported that hepatic steatosis disturbs autophagic proteolysis via suppression of both autophagic induction and lysosomal function. Here, we demonstrate that autophagic acidification was altered by a decrease in lysosomal proton pump vacuolar-ATPase (V-ATPase) in steatohepatitis. The number of autophagic vesicles was increased in hepatocytes from obese KKAy mice as compared to control. Similarly, autophagic membrane protein LC3-II and lysosomal protein LAMP-2 expression were enhanced in KKAy mice liver. Nevertheless, both phospho-mTOR and p62 expression were augmented in KKAy mice liver. More than 70% of autophagosomes were stained by LysoTracker Red (LTR) in hepatocytes from control mice; however, the percentage of acidic autolysosomes was decreased in hepatocytes from KKAy mice significantly (40.1 ± 3.48%). Both protein and RNA level of V-ATPase subunits ATP6v1a, ATP6v1b, ATP6v1d in isolated lysosomes were suppressed in KKAy mice as compared to control. Interestingly, incubation with mTOR inhibitor rapamycin increased in the rate of LTR-positive autolysosomes in hepatocytes from KKAy mice and suppressed p62 accumulation in the liver from KKAy mice which correlated to an increase in the V-ATPase subunits expression. These results indicate that down-regulation of V-ATPase due to hepatic steatosis causes autophagic dysfunction via disruption of lysosomal and autophagic acidification. Moreover, activation of mTOR plays a pivotal role on dysregulation of lysosomal and autophagic acidification by modulation of V-ATPase expression and could therefore be a useful therapeutic target to ameliorate dysfunction of autophagy in NAFLD.
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Affiliation(s)
- Eisuke Nakadera
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Shunhei Yamashina
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan.
| | - Kousuke Izumi
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Yoshihiro Inami
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Toshifumi Sato
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Hirofumi Fukushima
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Kazuyoshi Kon
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Kenichi Ikejima
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Takashi Ueno
- Division of Proteomics and Biomolecular Science, Juntendo University, School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Sumio Watanabe
- Department of Gastroenterology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan
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20
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Morel N, Poëa-Guyon S. The membrane domain of vacuolar H(+)ATPase: a crucial player in neurotransmitter exocytotic release. Cell Mol Life Sci 2015; 72:2561-73. [PMID: 25795337 PMCID: PMC11113229 DOI: 10.1007/s00018-015-1886-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 03/10/2015] [Accepted: 03/12/2015] [Indexed: 12/31/2022]
Abstract
V-ATPases are multimeric enzymes made of two sectors, a V1 catalytic domain and a V0 membrane domain. They accumulate protons in various intracellular organelles. Acidification of synaptic vesicles by V-ATPase energizes the accumulation of neurotransmitters in these storage organelles and is therefore required for efficient synaptic transmission. In addition to this well-accepted role, functional studies have unraveled additional hidden roles of V0 in neurotransmitter exocytosis that are independent of the transport of protons. V0 interacts with SNAREs and calmodulin, and perturbing these interactions affects neurotransmitter release. Here, we discuss these data in relation with previous results obtained in reconstituted membranes and on yeast vacuole fusion. We propose that V0 could be a sensor of intra-vesicular pH that controls the exocytotic machinery, probably regulating SNARE complex assembly during the synaptic vesicle priming step, and that, during the membrane fusion step, V0 might favor lipid mixing and fusion pore stability.
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Affiliation(s)
- Nicolas Morel
- Centre de Neurosciences Paris-Sud, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8195 and Université Paris-Sud, 91405, Orsay, France,
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21
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Shibata H, Tsuchikawa H, Hayashi T, Matsumori N, Murata M, Usui T. Modification of Bafilomycin Structure to Efficiently Synthesize Solid-State NMR Probes that Selectively Bind to Vacuolar-Type ATPase. Chem Asian J 2015; 10:915-24. [DOI: 10.1002/asia.201403299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Indexed: 01/05/2023]
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22
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Parsons LM, Portela M, Grzeschik NA, Richardson HE. Lgl regulates Notch signaling via endocytosis, independently of the apical aPKC-Par6-Baz polarity complex. Curr Biol 2014; 24:2073-2084. [PMID: 25220057 DOI: 10.1016/j.cub.2014.07.075] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 07/01/2014] [Accepted: 07/28/2014] [Indexed: 12/17/2022]
Abstract
BACKGROUND The Drosophila melanogaster junctional neoplastic tumor suppressor, Lethal-2-giant larvae (Lgl), is a regulator of apicobasal cell polarity and tissue growth. We have previously shown in the developing Drosophila eye epithelium that, without affecting cell polarity, depletion of Lgl results in ectopic cell proliferation and blockage of developmental cell death due to deregulation of the Hippo signaling pathway. RESULTS Here, we show that Notch signaling is increased in lgl-depleted eye tissue, independently of Lgl's function in apicobasal cell polarity. The upregulation of Notch signaling is ligand dependent and correlates with accumulation of cleaved Notch. Concomitant with higher cleaved Notch levels in lgl- tissue, early endosomes (Avalanche [Avl+]), recycling endosomes (Rab11+), early multivesicular bodies (Hrs+), and acidified vesicles, but not late endosomal markers (Car+ and Rab7+), accumulate. Colocalization studies revealed that Lgl associates with early to late endosomes and lysosomes. Upregulation of Notch signaling in lgl- tissue requires dynamin- and Rab5-mediated endocytosis and vesicle acidification but is independent of Hrs/Stam or Rab11 activity. Furthermore, Lgl regulates Notch signaling independently of the aPKC-Par6-Baz apical polarity complex. CONCLUSIONS Altogether, our data show that Lgl regulates endocytosis to restrict vesicle acidification and prevent ectopic ligand-dependent Notch signaling. This Lgl function is independent of the aPKC-Par6-Baz polarity complex and uncovers a novel attenuation mechanism of ligand-activated Notch signaling during Drosophila eye development.
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Affiliation(s)
- Linda M Parsons
- Cell Cycle and Development Laboratory, Research Division, Peter MacCallum Cancer Centre, 7 St. Andrew's Place, East Melbourne, Melbourne, VIC 3002, Australia; Department of Genetics, University of Melbourne, 1-100 Grattan Street, Parkville, Melbourne, VIC 3010, Australia
| | - Marta Portela
- Cell Cycle and Development Laboratory, Research Division, Peter MacCallum Cancer Centre, 7 St. Andrew's Place, East Melbourne, Melbourne, VIC 3002, Australia
| | - Nicola A Grzeschik
- Cell Cycle and Development Laboratory, Research Division, Peter MacCallum Cancer Centre, 7 St. Andrew's Place, East Melbourne, Melbourne, VIC 3002, Australia
| | - Helena E Richardson
- Cell Cycle and Development Laboratory, Research Division, Peter MacCallum Cancer Centre, 7 St. Andrew's Place, East Melbourne, Melbourne, VIC 3002, Australia; Sir Peter MacCallum Department of Oncology, Peter MacCallum Cancer Centre, 7 St. Andrew's Place, East Melbourne, Melbourne, VIC 3002, Australia; Department of Biochemistry and Molecular Biology, University of Melbourne, 1-100 Grattan Street, Parkville, Melbourne, VIC 3010, Australia; Department of Anatomy and Neuroscience, University of Melbourne, 1-100 Grattan Street, Parkville, Melbourne, VIC 3010, Australia.
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Figliuolo VR, Chaves SP, Santoro GF, Coutinho CMLM, Meyer-Fernandes JR, Rossi-Bergmann B, Coutinho-Silva R. Periodate-oxidized ATP modulates macrophage functions during infection with Leishmania amazonensis. Cytometry A 2014; 85:588-600. [PMID: 24804957 DOI: 10.1002/cyto.a.22449] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 11/30/2013] [Accepted: 01/27/2014] [Indexed: 12/11/2022]
Abstract
Previously, we showed that treating macrophages with ATP impairs the intracellular growth of Leishmania amazonensis, and that the P2X7 purinergic receptor is overexpressed during leishmaniasis. In the present study, we directly evaluated the effect of periodate-oxidized ATP (oATP) on parasite control in Leishmania-infected macrophages. We found that oATP impaired the attachment/entrance of L. amazonensis promastigotes to C57BL/6 mouse macrophages in a P2X7 receptor-independent manner, as macrophages from P2X7(-/-) mice were similarly affected. Although oATP directly inhibited the growth of axenic promastigotes in culture, promoted rapid ultrastructural alterations, and impaired Leishmania internalization by macrophages, it did not affect intracellular parasite multiplication. Upon infection, phagosomal acidification was diminished in oATP-treated macrophages, accompanied by reduced endosomal proteolysis. Likewise, MHC class II molecules expression and ectoATPase activity was decreased by oATP added to macrophages at the time of parasite infection. These inhibitory effects were not due to a cytotoxic effect, as no additional release of lactate dehydrogenase was detected in culture supernatants. Moreover, the capacity of macrophages to produce nitric oxide and reactive oxygen species was not affected by the presence of oATP during infection. We conclude that oATP directly affects extracellular parasite integrity and macrophage functioning.
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Affiliation(s)
- V R Figliuolo
- Laboratório de Imunofisiologia, Instituto de Biofísica Carlos Chagas Filho-IBCCF, Universidade Federal do Rio de Janeiro, RJ, Brazil; Instituto Nacional para Pesquisa Translacional em Saúde e Ambiente na Região Amazônica, Conselho Nacional de Desenvolvimento Científico e Tecnológico/MCT, Brasil
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24
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Shibata H, Tsuchikawa H, Matsumori N, Murata M, Usui T. Design and Synthesis of 24-Fluorinated Bafilomycin Analogue as an NMR Probe with Potent Inhibitory Activity to Vacuolar-type ATPase. CHEM LETT 2014. [DOI: 10.1246/cl.131099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Hajime Shibata
- Graduate School of Science, Osaka University
- ERATO, Lipid Active Structure Project, Japan Science and Technology Agency
| | | | | | - Michio Murata
- Graduate School of Science, Osaka University
- ERATO, Lipid Active Structure Project, Japan Science and Technology Agency
| | - Takeo Usui
- Faculty of Life and Environmental Sciences, University of Tsukuba
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25
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Vibrio effector protein, VopQ, forms a lysosomal gated channel that disrupts host ion homeostasis and autophagic flux. Proc Natl Acad Sci U S A 2013; 110:11559-64. [PMID: 23798441 DOI: 10.1073/pnas.1307032110] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Defects in normal autophagic pathways are implicated in numerous human diseases--such as neurodegenerative diseases, cancer, and cardiomyopathy--highlighting the importance of autophagy and its proper regulation. Herein we show that Vibrio parahaemolyticus uses the type III effector VopQ (Vibrio outer protein Q) to alter autophagic flux by manipulating the partitioning of small molecules and ions in the lysosome. This effector binds to the conserved Vo domain of the vacuolar-type H(+)-ATPase and causes deacidification of the lysosomes within minutes of entering the host cell. VopQ forms a gated channel ∼18 Å in diameter that facilitates outward flux of ions across lipid bilayers. The electrostatic interactions of this type 3 secretion system effector with target membranes dictate its preference for host vacuolar-type H(+)-ATPase-containing membranes, indicating that its pore-forming activity is specific and not promiscuous. As seen with other effectors, VopQ is exploiting a eukaryotic mechanism, in this case manipulating lysosomal homeostasis and autophagic flux through transmembrane permeation.
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26
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Kartner N, Yao Y, Bhargava A, Manolson MF. Topology, glycosylation and conformational changes in the membrane domain of the vacuolar H+-ATPaseasubunit. J Cell Biochem 2013; 114:1474-87. [DOI: 10.1002/jcb.24489] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Accepted: 12/21/2012] [Indexed: 11/08/2022]
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27
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The zebrafish mutants for the V-ATPase subunits d, ac45, E, H and c and their variable pigment dilution phenotype. BMC Res Notes 2013; 6:39. [PMID: 23375000 PMCID: PMC3599454 DOI: 10.1186/1756-0500-6-39] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Accepted: 01/23/2013] [Indexed: 11/10/2022] Open
Abstract
Background The V-ATPase is a proton pump that creates an acidic medium, necessary for lysosome function and vesicular traffic. It is also essential for several developmental processes. Many enzymes, like the V-ATPase, are assemblies of multiple subunits, in which each one performs a specific function required to achieve full activity. In the zebrafish V-ATPase 15 different subunits form this multimeric complex and mutations in any of these subunits induce hypopigmentation or pigment dilution phenotype. We have previously found variability in the pigment dilution phenotype among five of the V-ATPase zebrafish mutants. This work presents additional information about such differences and is an update from a previous report. Findings We describe the variable phenotype severity observed among zebrafish V-ATPase pigment dilution mutants studying mRNA expression levels from their corresponding genes. At the same time we carried out phylogenetic analysis for this genes. Conclusions Based in the similarities between different pigment dilution mutants we suggest that there is an essential role for V-ATPases in melanosome biogenesis and melanocyte survival. Neither variable expression levels for the different V-ATPase subunits studied here or the presence of duplicated genes seems to account for the variable phenotype severity from this group of mutants. We believe there are some similarities between the pigment dilution phenotype from zebrafish V-ATPase insertional mutants and pigment mutants obtained in a chemical screening (“Tubingen pigmentation mutants”). As for some of these “Tubingen mutants” the mutated gene has not been found we suggest that mutations in V-ATPase genes may be inducing their defects.
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28
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Thomas C. Bundling actin filaments from membranes: some novel players. FRONTIERS IN PLANT SCIENCE 2012; 3:188. [PMID: 22936939 PMCID: PMC3426786 DOI: 10.3389/fpls.2012.00188] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 08/01/2012] [Indexed: 05/04/2023]
Abstract
Progress in live-cell imaging of the cytoskeleton has significantly extended our knowledge about the organization and dynamics of actin filaments near the plasma membrane of plant cells. Noticeably, two populations of filamentous structures can be distinguished. On the one hand, fine actin filaments which exhibit an extremely dynamic behavior basically characterized by fast polymerization and prolific severing events, a process referred to as actin stochastic dynamics. On the other hand, thick actin bundles which are composed of several filaments and which are comparatively more stable although they constantly remodel as well. There is evidence that the actin cytoskeleton plays critical roles in trafficking and signaling at both the cell cortex and organelle periphery but the exact contribution of actin bundles remains unclear. A common view is that actin bundles provide the long-distance tracks used by myosin motors to deliver their cargo to growing regions and accordingly play a particularly important role in cell polarization. However, several studies support that actin bundles are more than simple passive highways and display multiple and dynamic roles in the regulation of many processes, such as cell elongation, polar auxin transport, stomatal and chloroplast movement, and defense against pathogens. The list of identified plant actin-bundling proteins is ever expanding, supporting that plant cells shape structurally and functionally different actin bundles. Here I review the most recently characterized actin-bundling proteins, with a particular focus on those potentially relevant to membrane trafficking and/or signaling.
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Affiliation(s)
- Clément Thomas
- Laboratory of Molecular and Cellular Oncology, Department of Oncology, Public Research Centre for Health (CRP-Santé)Luxembourg, Luxembourg
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29
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Toro EJ, Zuo J, Ostrov DA, Catalfamo D, Bradaschia-Correa V, Arana-Chavez V, Caridad AR, Neubert JK, Wronski TJ, Wallet SM, Holliday LS. Enoxacin directly inhibits osteoclastogenesis without inducing apoptosis. J Biol Chem 2012; 287:17894-17904. [PMID: 22474295 DOI: 10.1074/jbc.m111.280511] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Enoxacin has been identified as a small molecule inhibitor of binding between the B2-subunit of vacuolar H+-ATPase (V-ATPase) and microfilaments. It inhibits bone resorption by calcitriol-stimulated mouse marrow cultures. We hypothesized that enoxacin acts directly and specifically on osteoclasts by disrupting the interaction between plasma membrane-directed V-ATPases, which contain the osteoclast-selective a3-subunit of V-ATPase, and microfilaments. Consistent with this hypothesis, enoxacin dose-dependently reduced the number of multinuclear cells expressing tartrate-resistant acid phosphatase (TRAP) activity produced by RANK-L-stimulated osteoclast precursors. Enoxacin (50 μM) did not induce apoptosis as measured by TUNEL and caspase-3 assays. V-ATPases containing the a3-subunit, but not the "housekeeping" a1-subunit, were isolated bound to actin. Treatment with enoxacin reduced the association of V-ATPase subunits with the detergent-insoluble cytoskeleton. Quantitative PCR revealed that enoxacin triggered significant reductions in several osteoclast-selective mRNAs, but levels of various osteoclast proteins were not reduced, as determined by quantitative immunoblots, even when their mRNA levels were reduced. Immunoblots demonstrated that proteolytic processing of TRAP5b and the cytoskeletal protein L-plastin was altered in cells treated with 50 μM enoxacin. Flow cytometry revealed that enoxacin treatment favored the expression of high levels of DC-STAMP on the surface of osteoclasts. Our data show that enoxacin directly inhibits osteoclast formation without affecting cell viability by a novel mechanism that involves changes in posttranslational processing and trafficking of several proteins with known roles in osteoclast function. We propose that these effects are downstream to blocking the binding interaction between a3-containing V-ATPases and microfilaments.
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Affiliation(s)
- Edgardo J Toro
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - Jian Zuo
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - David A Ostrov
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida 32610
| | - Dana Catalfamo
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - Vivian Bradaschia-Correa
- Laboratory of Oral Biology, Department of Dental Materials, School of Dentistry, University of São Paulo, 05508-900 São Paulo SP, Brazil
| | - Victor Arana-Chavez
- Laboratory of Oral Biology, Department of Dental Materials, School of Dentistry, University of São Paulo, 05508-900 São Paulo SP, Brazil
| | - Aliana R Caridad
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - John K Neubert
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - Thomas J Wronski
- Department of Physiological Sciences, University of Florida, Gainesville, Florida 32610
| | - Shannon M Wallet
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida 32610
| | - L Shannon Holliday
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, Florida 32610; Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, Florida 32610.
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30
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Ma B, Qian D, Nan Q, Tan C, An L, Xiang Y. Arabidopsis vacuolar H+-ATPase (V-ATPase) B subunits are involved in actin cytoskeleton remodeling via binding to, bundling, and stabilizing F-actin. J Biol Chem 2012; 287:19008-17. [PMID: 22371505 DOI: 10.1074/jbc.m111.281873] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Vacuolar H(+)-ATPase (V-ATPase) is a membrane-bound multisubunit enzyme complex composed of at least 14 different subunits. The complex regulates the physiological processes of a cell by controlling the acidic environment, which is necessary for certain activities and the interaction with the actin cytoskeleton through its B and C subunits in both humans and yeast. Arabidopsis V-ATPase has three B subunits (AtVAB1, AtVAB2, and AtVAB3), which share 97.27% sequence identity and have two potential actin-binding sites, indicating that these AtVABs may have crucial functions in actin cytoskeleton remodeling and plant cell development. However, their biochemical functions are poorly understood. In this study, we demonstrated that AtVABs bind to and co-localize with F-actin, bundle F-actin to form higher order structures, and stabilize actin filaments in vitro. In addition, the AtVABs also show different degrees of activities in capping the barbed ends but no nucleating activities, and these activities were not regulated by calcium. The functional similarity and differences of the AtVABs implied that they may play cooperative and distinct roles in Arabidopsis cells.
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Affiliation(s)
- Binyun Ma
- School of life Sciences, Lanzhou University, Lanzhou 730070, China
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31
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Chouabe C, Eyraud V, Da Silva P, Rahioui I, Royer C, Soulage C, Bonvallet R, Huss M, Gressent F. New mode of action for a knottin protein bioinsecticide: pea albumin 1 subunit b (PA1b) is the first peptidic inhibitor of V-ATPase. J Biol Chem 2011; 286:36291-6. [PMID: 21890633 PMCID: PMC3196078 DOI: 10.1074/jbc.m111.281055] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Revised: 09/01/2011] [Indexed: 11/06/2022] Open
Abstract
PA1b (for pea albumin 1 subunit b) is a plant bioinsecticide lethal to several pests that are important in agriculture or human health. PA1b belongs to the inhibitory cystine knot family or knottin family. Originating from a plant (the garden pea) commonly eaten by humans without any known toxic or allergic effects, PA1b is a candidate for transgenic applications and is one of the most promising biopesticides for pest control. Using whole-cell patch-clamp techniques on Sf9 PA1b-sensitive lepidopteran insect cells, we discovered that PA1b reversibly blocked ramp membrane currents in a dose-dependent manner (EC(50) = 0.52 μM). PA1b had the same effect as bafilomycin, a specific inhibitor of the vacuolar proton pump (V-type H(+)-ATPase), and the PA1b-sensitive current depended on the internal proton concentration. Biochemical assays on purified V-ATPase from the lepidopteran model Manduca sexta showed that PA1b inhibited the V(1)V(0)-type H(+)-ATPase holoenzyme activity (IC(50) ∼ 70 nM) by interacting with the membrane-bound V(0) part of the V-ATPase. V-ATPase is a complex protein that has been studied increasingly because of its numerous physiological roles. In the midgut of insects, V-ATPase activity is essential for energizing nutrient absorption, and the results reported in this work explain the entomotoxic properties of PA1b. Targeting V-ATPase is a promising means of combating insect pests, and PA1b represents the first peptidic V-ATPase inhibitor. The search for V-ATPase inhibitors is currently of great importance because it has been demonstrated that V-ATPase plays a role in so many physiological processes.
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Affiliation(s)
- Christophe Chouabe
- From UMR CNRS 5534, Centre de Génétique et de Physiologie Moléculaires et Cellulaires, Université de Lyon, F-69622 Villeurbanne, France
| | - Vanessa Eyraud
- INSA-Lyon (Institut National des Sciences Appliquées), INRA (Institut National pour la Recherche Agronomique), UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Université de Lyon, F-69621 Villeurbanne, France
| | - Pedro Da Silva
- INSA-Lyon (Institut National des Sciences Appliquées), INRA (Institut National pour la Recherche Agronomique), UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Université de Lyon, F-69621 Villeurbanne, France
| | - Isabelle Rahioui
- INSA-Lyon (Institut National des Sciences Appliquées), INRA (Institut National pour la Recherche Agronomique), UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Université de Lyon, F-69621 Villeurbanne, France
| | - Corinne Royer
- INSA-Lyon (Institut National des Sciences Appliquées), INRA (Institut National pour la Recherche Agronomique), UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Université de Lyon, F-69621 Villeurbanne, France
| | - Christophe Soulage
- INSA-Lyon, CarMeN, INSERM U1060, Université de Lyon 1, F-69621 Villeurbanne, France, and
| | - Robert Bonvallet
- From UMR CNRS 5534, Centre de Génétique et de Physiologie Moléculaires et Cellulaires, Université de Lyon, F-69622 Villeurbanne, France
| | - Markus Huss
- the Abteilung Tierphysiologie, Fachbereich Biologie/Chemie, Universität Osnabrück, 49069 Osnabrück, Germany
| | - Frédéric Gressent
- INSA-Lyon (Institut National des Sciences Appliquées), INRA (Institut National pour la Recherche Agronomique), UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Université de Lyon, F-69621 Villeurbanne, France
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