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Pizzo F, Mangione MR, Librizzi F, Manno M, Martorana V, Noto R, Vilasi S. The Possible Role of the Type I Chaperonins in Human Insulin Self-Association. Life (Basel) 2022; 12:life12030448. [PMID: 35330199 PMCID: PMC8949404 DOI: 10.3390/life12030448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/11/2022] [Accepted: 03/16/2022] [Indexed: 11/16/2022] Open
Abstract
Insulin is a hormone that attends to energy metabolism by regulating glucose levels in the bloodstream. It is synthesised within pancreas beta-cells where, before being released into the serum, it is stored in granules as hexamers coordinated by Zn2+ and further packaged in microcrystalline structures. The group I chaperonin cpn60, known for its assembly-assisting function, is present, together with its cochaperonin cpn10, at each step of the insulin secretory pathway. However, the exact function of the heat shock protein in insulin biosynthesis and processing is still far from being understood. Here we explore the possibility that the molecular machine cpn60/cpn10 could have a role in insulin hexameric assembly and its further crystallization. Moreover, we also evaluate their potential protective effect in pathological insulin aggregation. The experiments performed with the cpn60 bacterial homologue, GroEL, in complex with its cochaperonin GroES, by using spectroscopic methods, microscopy and hydrodynamic techniques, reveal that the chaperonins in vitro favour insulin hexameric organisation and inhibit its aberrant aggregation. These results provide new details in the field of insulin assembly and its related disorders.
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Caruso Bavisotto C, Marino Gammazza A, Campanella C, Bucchieri F, Cappello F. Extracellular heat shock proteins in cancer: From early diagnosis to new therapeutic approach. Semin Cancer Biol 2021; 86:36-45. [PMID: 34563652 DOI: 10.1016/j.semcancer.2021.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 09/10/2021] [Accepted: 09/19/2021] [Indexed: 02/08/2023]
Abstract
In cancer, human cells lose the ability to properly control the series of events that occur constantly during cell growth and division, including protein expression, stability, and dynamics. Heat shock proteins (Hsps) are key molecules in these events, constitutively expressed at high levels and could furthermore be induced by the response to cancer-induced stress. In tumor cells, Hsps have been shown to be implicated in the regulation of apoptosis, immune responses, angiogenesis and metastasis; in some cases, they can be overexpressed and dysregulated, representing important cancer hallmarks. In the past few years, it has been demonstrated that Hsps can be released by tumor cells through several secreting pathways, including the extracellular vesicles (EVs), thus modulating the tumor microenvironment as well as long-distance intercellular communication and metastatization. In this review, we discuss the role of extracellular Hsps in cancer, with a particular interest in Hsps in EVs. We would also like to highlight the importance of fully understanding of the role of extracellular Hsps released by EVs and encourage further research in this field the use of Hsps as early cancer biomarkers and therapeutic targets.
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Affiliation(s)
- Celeste Caruso Bavisotto
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), Institute of Anatomy and Histology, University of Palermo, Palermo, Italy; Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Antonella Marino Gammazza
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), Institute of Anatomy and Histology, University of Palermo, Palermo, Italy
| | - Claudia Campanella
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), Institute of Anatomy and Histology, University of Palermo, Palermo, Italy
| | - Fabio Bucchieri
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), Institute of Anatomy and Histology, University of Palermo, Palermo, Italy
| | - Francesco Cappello
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), Institute of Anatomy and Histology, University of Palermo, Palermo, Italy; Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy.
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Gu W, Yang Y, Ning C, Wang Y, Hu J, Zhang M, Kuang S, Sun Y, Li Y, Zhang Y, Sun J, Ying D, Xu S. Identification and characteristics of insulin-like growth factor system in the brain, liver, and gonad during development of a seasonal breeding teleost, Pampus argenteus. Gen Comp Endocrinol 2021; 300:113645. [PMID: 33058908 DOI: 10.1016/j.ygcen.2020.113645] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 08/31/2020] [Accepted: 10/06/2020] [Indexed: 12/12/2022]
Abstract
Reproductive activity is closely related to the development and function of the brain and liver in teleosts, particularly in seasonal breeding teleosts. This study measured the involvement of the insulin-like growth factor (IGF) system in controlling the reproduction of the silver pomfret Pampus argenteus, a seasonal breeding tropical to temperate commercial fish. We cloned and characterized the cDNAs of igfs (igf2 and igf3) and igfrs (igf1ra, igf1rb, and igf2r) and examined their transcript levels in relation to seasonal reproduction. Phylogenetic analyses revealed that two types of IGFs (IGF-1 and IGF-2) and three types of IGFRs (IGF1RA, IGF1RB, and IGF2R) of the silver pomfret were clustered with those of teleosts; however, IGF-3 was a transmembrane protein different with the IGF-3 of other teleosts. The expression of IGF-3 was gonad-specific in the silver pomfret. The transcript levels of igf1 in the female brain were the highest, and the levels of igfrs in both sexes' brains increased during gametogenesis. Meanwhile, igfs and igfrs maintained high transcript levels in both sexes' liver and gonad during vitellogenesis and spermatogonia proliferation. We concluded that the development and activities of brain, liver, and gonad were related to the IGF system (IGFs and IGFRs). And the IGFs were mainly expressed in the liver. Nevertheless, gonadal development, especially vitellogenesis and spermatogonia proliferation, were related with IGFs in this species.
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Affiliation(s)
- Weiwei Gu
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Yang Yang
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China.
| | - Chao Ning
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Yajun Wang
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China.
| | - Jiabao Hu
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Man Zhang
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Siwen Kuang
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Yibo Sun
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Yaya Li
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Youyi Zhang
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Jiachu Sun
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
| | - Dongxu Ying
- Ningbo Xiangshangang Aquatic Product Introduction and Breeding Co. Ltd., Ningbo, China
| | - Shanliang Xu
- College of Marine Science, Ningbo University, Ningbo, China; Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, Ningbo, China; Collaborative Innovation Center for Zhejiang Marine High-efficiency and Healthy Aquaculture, Ningbo, China; Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ministry of Education, Ningbo, China
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Cserép C, Pósfai B, Dénes Á. Shaping Neuronal Fate: Functional Heterogeneity of Direct Microglia-Neuron Interactions. Neuron 2020; 109:222-240. [PMID: 33271068 DOI: 10.1016/j.neuron.2020.11.007] [Citation(s) in RCA: 110] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 10/13/2020] [Accepted: 11/06/2020] [Indexed: 12/11/2022]
Abstract
The functional contribution of microglia to normal brain development, healthy brain function, and neurological disorders is increasingly recognized. However, until recently, the nature of intercellular interactions mediating these effects remained largely unclear. Recent findings show microglia establishing direct contact with different compartments of neurons. Although communication between microglia and neurons involves intermediate cells and soluble factors, direct membrane contacts enable a more precisely regulated, dynamic, and highly effective form of interaction for fine-tuning neuronal responses and fate. Here, we summarize the known ultrastructural, molecular, and functional features of direct microglia-neuron interactions and their roles in brain disease.
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Affiliation(s)
- Csaba Cserép
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Balázs Pósfai
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary; Szentágothai János Doctoral School of Neurosciences, Semmelweis University, Üllői út 26, 1085 Budapest, Hungary
| | - Ádám Dénes
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary.
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Abstract
The complement system consists of more than 30 plasma as well as cell surface proteins that together constitute a major arm of the immune system. The long-held belief is that most of the complement components are synthesized by hepatocytes in the liver and then secreted into the blood. However, there is also substantial evidence that several if not all of the complement proteins are synthesized extrahepatically by a wide range of cell types, including polymorphonuclear leukocytes, monocytes, macrophages, dendritic cells, lymphocytes, epithelial cells, fibroblasts, and neuronal cells. However, despite the proven evidence that complement proteins indeed could be synthesized non-hepatic cells and even found in unexpected places, the recent finding that certain complement proteins could be activated in intracellular spaces nonetheless has opened up a new debate. In fact, some in the field unfortunately seem to be in favor of rejecting this notion rather vehemently on the untenable and myopic grounds that complement proteins could not be found in intracellular compartments despite evidence to the contrary. Therefore, this opinion article is meant to remind colleagues in the field that new discoveries with the potential to shift established functional paradigms should be encouraged and celebrated even if, at first glance, they seem to defy the odds.
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Affiliation(s)
- Berhane Ghebrehiwet
- Department of Medicine, Stony Brook University, Stony Brook, New York, 11794-0001, USA
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6
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Mohamed D, Amin R. Involvement of heat shock proteins 60 in acetyl salicylic acid radioprotection of Albino rat submandibular salivary gland. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2019. [DOI: 10.1016/j.jrras.2015.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- D.G. Mohamed
- Oral Biology Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - R.M. Amin
- Oral Biology Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
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Barna J, Dimén D, Puska G, Kovács D, Csikós V, Oláh S, Udvari EB, Pál G, Dobolyi Á. Complement component 1q subcomponent binding protein in the brain of the rat. Sci Rep 2019; 9:4597. [PMID: 30872665 PMCID: PMC6418184 DOI: 10.1038/s41598-019-40788-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 02/19/2019] [Indexed: 12/17/2022] Open
Abstract
Complement component 1q subcomponent binding protein (C1qbp) is a multifunctional protein involved in immune response, energy homeostasis of cells as a plasma membrane receptor, and a nuclear, cytoplasmic or mitochondrial protein. Recent reports suggested its neuronal function, too, possibly in axon maintenance, synaptic function, and neuroplasticity. Therefore, we addressed to identify C1qbp in the rat brain using in situ hybridization histochemistry and immunolabelling at light and electron microscopic level. C1qbp has a topographical distribution in the brain established by the same pattern of C1qbp mRNA-expressing and protein-containing neurons with the highest abundance in the cerebral cortex, anterodorsal thalamic nucleus, hypothalamic paraventricular (PVN) and arcuate nuclei, spinal trigeminal nucleus. Double labelling of C1qbp with the neuronal marker NeuN, with the astrocyte marker S100, and the microglia marker Iba1 demonstrated the presence of C1qbp in neurons but not in glial cells in the normal brain, while C1qbp appeared in microglia following their activation induced by focal ischemic lesion. Only restricted neurons expressed C1qbp, for example, in the PVN, magnocellular neurons selectively contained C1qbp. Further double labelling by using the mitochondria marker Idh3a antibody suggested the mitochondrial localization of C1qbp in the brain, confirmed by correlated light and electron microscopy at 3 different brain regions. Post-embedding immunoelectron microscopy also suggested uneven C1qbp content of mitochondria in different brain areas but also heterogeneity within single neurons. These data suggest a specific function of C1qbp in the brain related to mitochondria, such as the regulation of local energy supply in neuronal cells.
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Affiliation(s)
- János Barna
- Department of Anatomy, Histology and Embryology, Semmelweis University, Budapest, Hungary
| | - Diána Dimén
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Gina Puska
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Dávid Kovács
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Vivien Csikós
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Szilvia Oláh
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Edina B Udvari
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary
| | - Gabriella Pál
- Hungarian Defence Forces Military Hospital, Budapest, Hungary
| | - Árpád Dobolyi
- MTA-ELTE Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Hungarian Academy of Sciences and Eötvös Loránd University, Budapest, Hungary.
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8
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Cappello F, Conway de Macario E, Rappa F, Zummo G, Macario AJL. Immunohistochemistry of Human Hsp60 in Health and Disease: From Autoimmunity to Cancer. Methods Mol Biol 2018; 1709:293-305. [PMID: 29177667 DOI: 10.1007/978-1-4939-7477-1_21] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Hsp60 (also called Cpn60) is a chaperonin with essential functions for cell physiology and survival. Additionally, its involvement in the pathogenesis of a variety of diseases (e.g., some autoimmune disorders and cancer) is becoming evident with new research. For example, the distribution and levels of Hsp60 in cells and tissues have been found altered in many pathologic conditions, and the significance of these alterations is being investigated in a number of laboratories. The aim of this ongoing research is to determine the meaning of these Hsp60 alterations with regard to pathogenetic mechanisms, diagnosis, classification of lesions, and assessing prognosis and response to treatment.Hsp60 occurs in the mitochondria, i.e., its typical residence according to classic knowledge, and also in other locales, such as the cytosol, the cell membrane, the intercellular space, and biological fluids (e.g., blood and cerebrospinal fluid). Detection and quantitative determinations in all these locations are becoming essential components of laboratory pathology in clinics and research. Consequently, immunohistochemistry targeting Hsp60 is also becoming essential for pathologists and researchers interested in disorders involving this chaperonin.In this chapter, we summarize some recent discoveries on the participation of Hsp60 in the pathogenesis of human diseases, and describe in detail how to perform immunohistochemical reactions for detecting the chaperonin, determining its location, and measuring its quantitative levels.
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Affiliation(s)
- Francesco Cappello
- Human Anatomy Section, Department of Experimental Biomedicine and Clinical Neurosciences, University of Palermo, Palermo, Italy.,Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Everly Conway de Macario
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy.,Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore, and IMET; Columbus Center, 701 East Pratt Street, Baltimore, MD, 21202, USA
| | - Francesca Rappa
- Human Anatomy Section, Department of Experimental Biomedicine and Clinical Neurosciences, University of Palermo, Palermo, Italy.,Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Giovanni Zummo
- Human Anatomy Section, Department of Experimental Biomedicine and Clinical Neurosciences, University of Palermo, Palermo, Italy
| | - Alberto J L Macario
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy. .,Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore, and IMET; Columbus Center, 701 East Pratt Street, Baltimore, MD, 21202, USA.
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McRobb LS, Lee VS, Simonian M, Zhao Z, Thomas SG, Wiedmann M, Raj JVA, Grace M, Moutrie V, McKay MJ, Molloy MP, Stoodley MA. Radiosurgery Alters the Endothelial Surface Proteome: Externalized Intracellular Molecules as Potential Vascular Targets in Irradiated Brain Arteriovenous Malformations. Radiat Res 2017; 187:66-78. [PMID: 28054837 DOI: 10.1667/rr14518.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Stereotactic radiosurgery (SRS) is an established treatment for brain arteriovenous malformations (AVMs) that drives blood vessel closure through cellular proliferation, thrombosis and fibrosis, but is limited by a delay to occlusion of 2-3 years and a maximum treatable size of 3 cm. In this current study we used SRS as a priming tool to elicit novel protein expression on the endothelium of irradiated AVM vessels, and these proteins were then targeted with prothrombotic conjugates to induce rapid thrombosis and vessel closure. SRS-induced protein changes on the endothelium in an animal model of AVM were examined using in vivo biotin labeling of surface-accessible proteins and comparative proteomics. LC-MS/MS using SWATH acquisition label-free mass spectrometry identified 280 proteins in biotin-enriched fractions. The abundance of 56 proteins increased after irradiation of the rat arteriovenous fistula (20 Gy, ≥1.5-fold). A large proportion of intracellular proteins were present in this subset: 29 mitochondrial and 9 cytoskeletal. Three of these proteins were chosen for further validation based on previously published evidence for surface localization and a role in autoimmune stimulation: cardiac troponin I (TNNI3); manganese superoxide dismutase (SOD2); and the E2 subunit of the pyruvate dehydrogenase complex (PDCE2). Immunostaining of AVM vessels confirmed an increase in abundance of PDCE2 across the vessel wall, but not a measurable increase in TNNI3 or SOD2. All three proteins co-localized with the endothelium after irradiation, however, more detailed subcellular distribution could not be accurately established. In vitro, radiation-stimulated surface translocation of all three proteins was confirmed in nonpermeabilized brain endothelial cells using immunocytochemistry. Total protein abundance increased modestly after irradiation for PDCE2 and SOD2 but decreased for TNNI3, suggesting that radiation primarily affects subcellular distribution rather than protein levels. The novel identification of these proteins as surface exposed in response to radiation raises important questions about their potential role in radiation-induced inflammation, fibrosis and autoimmunity, but may also provide unique candidates for vascular targeting in brain AVMs and other vascular tissues.
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Affiliation(s)
- Lucinda S McRobb
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Vivienne S Lee
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Margaret Simonian
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia.,c Department of Biological Chemistry, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, California
| | - Zhenjun Zhao
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Santhosh George Thomas
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Markus Wiedmann
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Jude V Amal Raj
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Michael Grace
- d Genesis Cancer Care, Macquarie University Hospital, Sydney, New South Wales, Australia
| | - Vaughan Moutrie
- d Genesis Cancer Care, Macquarie University Hospital, Sydney, New South Wales, Australia
| | - Matthew J McKay
- b Australian Proteome Analysis Facility, Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Mark P Molloy
- b Australian Proteome Analysis Facility, Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Marcus A Stoodley
- a Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
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10
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Dos Santos-Pinto JRA, Garcia AMC, Arcuri HA, Esteves FG, Salles HC, Lubec G, Palma MS. Silkomics: Insight into the Silk Spinning Process of Spiders. J Proteome Res 2016; 15:1179-93. [PMID: 26923066 DOI: 10.1021/acs.jproteome.5b01056] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The proteins from the silk-producing glands were identified using both a bottom-up gel-based proteomic approach as well as from a shotgun proteomic approach. Additionally, the relationship between the functions of identified proteins and the spinning process was studied. A total of 125 proteins were identified in the major ampullate, 101 in the flagelliform, 77 in the aggregate, 75 in the tubuliform, 68 in the minor ampullate, and 23 in aciniform glands. On the basis of the functional classification using Gene Ontology, these proteins were organized into seven different groups according to their general function: (i) web silk proteins-spidroins, (ii) proteins related to the folding/conformation of spidroins, (iii) proteins that protect silk proteins from oxidative stress, (iv) proteins involved in fibrillar preservation of silks in the web, (v) proteins related to ion transport into and out of the glands during silk fiber spinning, (vi) proteins involved in prey capture and pre-digestion, and (vii) housekeeping proteins from all of the glands. Thus, a general mechanism of action for the identified proteins in the silk-producing glands from the Nephila clavipes spider was proposed; the current results also indicate that the webs play an active role in prey capture.
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Affiliation(s)
- José Roberto Aparecido Dos Santos-Pinto
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil.,Department of Pediatrics, Medical University of Vienna , Vienna 1090, Austria
| | - Ana Maria Caviquioli Garcia
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil
| | - Helen Andrade Arcuri
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil
| | - Franciele Grego Esteves
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil
| | - Heliana Clara Salles
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil
| | - Gert Lubec
- Department of Pediatrics, Medical University of Vienna , Vienna 1090, Austria
| | - Mario Sergio Palma
- Center of Study of Social Insects, Department of Biology, Institute of Biosciences of Rio Claro, São Paulo State University (UNESP) , Rio Claro, São Paulo 13500, Brazil
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11
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Ravera S, Bartolucci M, Garbati P, Ferrando S, Calzia D, Ramoino P, Balestrino M, Morelli A, Panfoli I. Evaluation of the Acquisition of the Aerobic Metabolic Capacity by Myelin, during its Development. Mol Neurobiol 2015; 53:7048-7056. [PMID: 26676569 DOI: 10.1007/s12035-015-9575-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 11/29/2015] [Indexed: 12/15/2022]
Abstract
Our previous reports indicate that the electron transfer chain and FoF1-ATP synthase are functionally expressed in myelin sheath, performing an extra-mitochondrial oxidative phosphorylation (OXPHOS), which would provide energy to the nerve axon. This supports the idea that myelin plays a trophic role for the axon. Although the four ETC complexes and ATP synthase are considered exquisite mitochondrial proteins, they are found ectopically expressed in several membranous structures. This study was designed to understand when and how the mitochondrial OXPHOS machinery is embedded in myelin, following myelinogenesis in the rat, which starts at birth and continues until the first month of age. Rats were sacrificed at different time points (from day 5 to 90 post birth). Western blot, immunofluorescence microscopy, luminometric, and oximetric analyses show that the isolated myelin starts to show OXPHOS components around the 11th day after birth and increases proportionally to the rat age, becoming similar to those of adult rat around the 30-third day. Interestingly, WB data show the same temporal relationship between myelinogenesis and appearance of proteins involved in mitochondrial fusion and cellular trafficking. It may be speculated that the OXPHOS complexes may be transferred to the endoplasmic reticulum membrane (known to interact with mitochondria) and from there through the Golgi apparatus to the forming myelin membrane.
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Affiliation(s)
- Silvia Ravera
- Department of Pharmacy (DIFAR), Biochemistry Laboratory, University of Genova, Viale Benedetto XV 3, 16132, Genova, Italy.
| | - Martina Bartolucci
- Department of Pharmacy (DIFAR), Biochemistry Laboratory, University of Genova, Viale Benedetto XV 3, 16132, Genova, Italy
| | - Patrizia Garbati
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Via de Toni 5, 16132, Genova, Italy
| | - Sara Ferrando
- DISTAV, University of Genova, C.so Europa 26, 16132, Genova, Italy
| | - Daniela Calzia
- Department of Pharmacy (DIFAR), Biochemistry Laboratory, University of Genova, Viale Benedetto XV 3, 16132, Genova, Italy
| | - Paola Ramoino
- DISTAV, University of Genova, C.so Europa 26, 16132, Genova, Italy
| | - Maurizio Balestrino
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Via de Toni 5, 16132, Genova, Italy
| | - Alessandro Morelli
- Department of Pharmacy (DIFAR), Biochemistry Laboratory, University of Genova, Viale Benedetto XV 3, 16132, Genova, Italy
| | - Isabella Panfoli
- Department of Pharmacy (DIFAR), Biochemistry Laboratory, University of Genova, Viale Benedetto XV 3, 16132, Genova, Italy
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Panfoli I, Ravera S, Podestà M, Cossu C, Santucci L, Bartolucci M, Bruschi M, Calzia D, Sabatini F, Bruschettini M, Ramenghi LA, Romantsik O, Marimpietri D, Pistoia V, Ghiggeri G, Frassoni F, Candiano G. Exosomes from human mesenchymal stem cells conduct aerobic metabolism in term and preterm newborn infants. FASEB J 2015; 30:1416-24. [PMID: 26655706 DOI: 10.1096/fj.15-279679] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 11/23/2015] [Indexed: 01/13/2023]
Abstract
Exosomes are secreted nanovesicles that are able to transfer RNA and proteins to target cells. The emerging role of mesenchymal stem cell (MSC) exosomes as promoters of aerobic ATP synthesis restoration in damaged cells, prompted us to assess whether they contain an extramitochondrial aerobic respiration capacity. Exosomes were isolated from culture medium of human MSCs from umbilical cord of ≥37-wk-old newborns or between 28- to 30-wk-old newborns (i.e.,term or preterm infants). Characterization of samples was conducted by cytofluorometry. Oxidative phosphorylation capacity was assessed by Western blot analysis, oximetry, and luminometric and fluorometric analyses. MSC exosomes express functional respiratory complexes I, IV, and V, consuming oxygen. ATP synthesis was only detectable in exosomes from term newborns, suggestive of a specific mechanism that is not completed at an early gestational age. Activities are outward facing and comparable to those detected in mitochondria isolated from term MSCs. MSC exosomes display an unsuspected aerobic respiratory ability independent of whole mitochondria. This may be relevant for their ability to rescue cell bioenergetics. The differential oxidative metabolism of pretermvs.term exosomes sheds new light on the preterm newborn's clinical vulnerability. A reduced ability to repair damaged tissue and an increased capability to cope with anoxic environment for preterm infants can be envisaged.-Panfoli, I., Ravera, S., Podestà, M., Cossu, C., Santucci, L., Bartolucci, M., Bruschi, M., Calzia, D., Sabatini, F., Bruschettini, M., Ramenghi, L. A., Romantsik, O., Marimpietri, D., Pistoia, V., Ghiggeri, G., Frassoni, F., Candiano, G. Exosomes from human mesenchymal stem cells conduct aerobic metabolism in term and preterm newborn infants.
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Affiliation(s)
- Isabella Panfoli
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Silvia Ravera
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Marina Podestà
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Claudia Cossu
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Laura Santucci
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Martina Bartolucci
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Maurizio Bruschi
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Daniela Calzia
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Federica Sabatini
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Matteo Bruschettini
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Luca Antonio Ramenghi
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Olga Romantsik
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Danilo Marimpietri
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Vito Pistoia
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Gianmarco Ghiggeri
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Francesco Frassoni
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
| | - Giovanni Candiano
- *Dipartimento di Farmacia, Laboratorio di Biochimica, Università di Genova, Genoa, Italy; and Laboratorio Cellule Staminali Post-Natali e Terapie Cellulari, Laboratory of Pathophysiology of Uremia, Neonatal Intensive Care Unit, and Laboratorio Oncologia, Istituto Giannina Gaslini, Genoa, Italy
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13
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Bartolucci M, Ravera S, Garbarino G, Ramoino P, Ferrando S, Calzia D, Candiani S, Morelli A, Panfoli I. Functional Expression of Electron Transport Chain and FoF1-ATP Synthase in Optic Nerve Myelin Sheath. Neurochem Res 2015; 40:2230-41. [PMID: 26334391 DOI: 10.1007/s11064-015-1712-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 08/23/2015] [Accepted: 08/27/2015] [Indexed: 12/15/2022]
Abstract
Our previous studies reported evidence for aerobic ATP synthesis by myelin from both bovine brainstem and rat sciatic nerve. Considering that the optic nerve displays a high oxygen demand, here we evaluated the expression and activity of the five Respiratory Complexes in myelin purified from either bovine or murine optic nerves. Western blot analyses on isolated myelin confirmed the expression of ND4L (subunit of Complex I), COX IV (subunit of Complex IV) and β subunit of F1Fo-ATP synthase. Moreover, spectrophotometric and in-gel activity assays on isolated myelin, as well as histochemical activity assays on both bovine and murine transversal optic nerve sections showed that the respiratory Complexes are functional in myelin and are organized in a supercomplex. Expression of oxidative phosphorylation proteins was also evaluated on bovine optic nerve sections by confocal and transmission electron microscopy. Having excluded a mitochondrial contamination of isolated myelin and considering the results form in situ analyses, it is proposed that the oxidative phosphorylation machinery is truly resident in optic myelin sheath. Data may shed a new light on the unknown trophic role of myelin sheath. It may be energy supplier for the axon, explaining why in demyelinating diseases and neuropathies, myelin sheath loss is associated with axonal degeneration.
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Affiliation(s)
- Martina Bartolucci
- Biochemistry Laboratory, Department of Pharmacy (DIFAR), University of Genova, Viale Benedetto XV, 3, 16132, Genoa, Italy
| | - Silvia Ravera
- Biochemistry Laboratory, Department of Pharmacy (DIFAR), University of Genova, Viale Benedetto XV, 3, 16132, Genoa, Italy.
| | - Greta Garbarino
- Department of Earth, Environmental and Life Sciences, (DISTAV), University of Genova, C.so Europa 26, 16132, Genoa, Italy
| | - Paola Ramoino
- Department of Earth, Environmental and Life Sciences, (DISTAV), University of Genova, C.so Europa 26, 16132, Genoa, Italy
| | - Sara Ferrando
- Department of Earth, Environmental and Life Sciences, (DISTAV), University of Genova, C.so Europa 26, 16132, Genoa, Italy
| | - Daniela Calzia
- Biochemistry Laboratory, Department of Pharmacy (DIFAR), University of Genova, Viale Benedetto XV, 3, 16132, Genoa, Italy
| | - Simona Candiani
- Department of Earth, Environmental and Life Sciences, (DISTAV), University of Genova, C.so Europa 26, 16132, Genoa, Italy
| | - Alessandro Morelli
- Biochemistry Laboratory, Department of Pharmacy (DIFAR), University of Genova, Viale Benedetto XV, 3, 16132, Genoa, Italy
| | - Isabella Panfoli
- Biochemistry Laboratory, Department of Pharmacy (DIFAR), University of Genova, Viale Benedetto XV, 3, 16132, Genoa, Italy
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14
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Sigala PA, Crowley JR, Henderson JP, Goldberg DE. Deconvoluting heme biosynthesis to target blood-stage malaria parasites. eLife 2015; 4. [PMID: 26173178 PMCID: PMC4532139 DOI: 10.7554/elife.09143] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 07/13/2015] [Indexed: 12/03/2022] Open
Abstract
Heme metabolism is central to blood-stage infection by the malaria parasite Plasmodium falciparum. Parasites retain a heme biosynthesis pathway but do not require its activity during infection of heme-rich erythrocytes, where they can scavenge host heme to meet metabolic needs. Nevertheless, heme biosynthesis in parasite-infected erythrocytes can be potently stimulated by exogenous 5-aminolevulinic acid (ALA), resulting in accumulation of the phototoxic intermediate protoporphyrin IX (PPIX). Here we use photodynamic imaging, mass spectrometry, parasite gene disruption, and chemical probes to reveal that vestigial host enzymes in the cytoplasm of Plasmodium-infected erythrocytes contribute to ALA-stimulated heme biosynthesis and that ALA uptake depends on parasite-established permeability pathways. We show that PPIX accumulation in infected erythrocytes can be harnessed for antimalarial chemotherapy using luminol-based chemiluminescence and combinatorial stimulation by low-dose artemisinin to photoactivate PPIX to produce cytotoxic reactive oxygen. This photodynamic strategy has the advantage of exploiting host enzymes refractory to resistance-conferring mutations. DOI:http://dx.doi.org/10.7554/eLife.09143.001 Malaria is a devastating infectious disease that is caused by single-celled parasites called Plasmodium that can live inside red blood cells. Several important proteins from these parasites require a small molecule called heme in order to work. The parasites have enzymes that make heme via a series of intermediate steps. However, it remains unclear exactly how important this ‘pathway’ of enzymes is for the parasite, and whether this pathway could be targeted by drugs to treat malaria. Now Sigala et al. have used a range of genetic and biochemical approaches to better understand the production of heme molecules in Plasmodium-infected red blood cells. First, several parasite genes that encode the enzymes used to make heme molecules were deleted. Unexpectedly, these gene deletions did not affect the ability of the infected blood cells to make heme. This result suggested that the parasites do not use their own pathway to produce heme while they are growing in the bloodstream. Sigala et al. then showed that human enzymes involved in making heme, most of which are also found within the infected red blood cells, are still active. These human enzymes provide a parallel pathway that can link up with the final parasite enzyme to generate heme. Further experiments revealed that the activity of the human enzymes could be strongly stimulated by providing the pathway with one of the building blocks used to make heme. This stimulation led to the build-up of an intermediate molecule called PPIX. This intermediate molecule can kill cells when it is exposed to light—a property that is called ‘phototoxicity’. Sigala et al. showed that treating infected red blood cells with a new combination of non-toxic chemicals that emit light can activate PPIX in the bloodstream and can selectively kill the malaria parasites while leaving uninfected cells intact. These findings suggest a new treatment that could be effective against blood-stage malaria. Furthermore, the parasite will be unable to easily mutate to avoid the effects of this treatment because it relies on human proteins that are already made. Future work is now needed to optimize the dosage and the combination of drugs that could provide such a treatment. DOI:http://dx.doi.org/10.7554/eLife.09143.002
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Affiliation(s)
- Paul A Sigala
- Department of Molecular Microbiology, Washington University School of Medicine, St Louis, United States
| | - Jan R Crowley
- Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, United States
| | - Jeffrey P Henderson
- Department of Molecular Microbiology, Washington University School of Medicine, St Louis, United States
| | - Daniel E Goldberg
- Department of Molecular Microbiology, Washington University School of Medicine, St Louis, United States
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15
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Reuss B, Schroten H, Ishikawa H, Asif AR. Cross-reactivity of Antibodies Directed to the Gram-Negative Bacterium Neisseria gonorrhoeae With Heat Shock Protein 60 and ATP-Binding Protein Correlates to Reduced Mitochondrial Activity in HIBCPP Choroid Plexus Papilloma Cells. J Mol Neurosci 2015; 57:123-38. [PMID: 26080747 DOI: 10.1007/s12031-015-0585-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 05/19/2015] [Indexed: 01/22/2023]
Abstract
Antibacterial antibodies can cause neurologic side-effects by cross-reactivity with cellular antigens. Here we investigated interactions of antibodies to Neisseria gonorrhoeae (α-NG) - maternal infections by which increases the offspring's risk for later psychosis-with HIBCPP cells, a cell culture model of choroid plexus epithelium. Immunocytochemistry and Western blotting with α-NG, revealed organelle-like intracellular staining in HIBCPP cells, and labelling of several immunoreactive bands in cellular protein. Two-dimensional Western blotting revealed several immunopositive spots, most prominent of which were identified by mass spectrometry as mitochondrially localized proteins heat shock protein 60 (Hsp60) and ATP-binding protein β-subunit (ATPB). Similarly α-NG interacted with commercial samples of these proteins as revealed by Western blotting. Three alternative methods (JC-1, Janus green and MTT staining) revealed α-NG to cause in HIBCPP cells a significant decrease in mitochondrial activity, which could be reverted by neuroleptic drugs. Immunoreactivity of α-NG with choroid plexus epithelium in human post mortem samples suggests in vivo relevance of these findings. Finally, distinctly different staining patterns of antibodies against Neisseria meningitidis (α-NM), confirmed antibody specificity. To our knowledge this is the first report that α-NG cross-reactivity with Hsp60 and ATPB impairs mitochondrial activity in choroid plexus epithelial cells, pathogenetic relevance of which needs further clarification.
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Affiliation(s)
- B Reuss
- Institute for Neuroanatomy, University Medicine Göttingen (UMG), Kreuzbergring 36, 37075, Göttingen, Federal Republic of Germany,
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16
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Kim JY, Kim N, Yenari MA. Mechanisms and potential therapeutic applications of microglial activation after brain injury. CNS Neurosci Ther 2014; 21:309-19. [PMID: 25475659 DOI: 10.1111/cns.12360] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 10/24/2014] [Accepted: 10/26/2014] [Indexed: 12/14/2022] Open
Abstract
As the resident immune cells of the central nervous system, microglia rapidly respond to brain insults, including stroke and traumatic brain injury. Microglial activation plays a major role in neuronal cell damage and death by releasing a variety of inflammatory and neurotoxic mediators. Their activation is an early response that may exacerbate brain injury and many other stressors, especially in the acute stages, but are also essential to brain recovery and repair. The full range of microglial activities is still not completely understood, but there is accumulating knowledge about their role following brain injury. We review recent progress related to the deleterious and beneficial effects of microglia in the setting of acute neurological insults and the current literature surrounding pharmacological interventions for intervention.
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Affiliation(s)
- Jong-Youl Kim
- Department of Neurology, San Francisco Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA, USA
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Panfoli I, Ravera S, Bruschi M, Candiano G, Morelli A. Proteomics unravels the exportability of mitochondrial respiratory chains. Expert Rev Proteomics 2014; 8:231-9. [DOI: 10.1586/epr.11.1] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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Milani L, Ghiselli F, Guerra D, Breton S, Passamonti M. A comparative analysis of mitochondrial ORFans: new clues on their origin and role in species with doubly uniparental inheritance of mitochondria. Genome Biol Evol 2013; 5:1408-34. [PMID: 23824218 PMCID: PMC3730352 DOI: 10.1093/gbe/evt101] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Despite numerous comparative mitochondrial genomics studies revealing that animal mitochondrial genomes are highly conserved in terms of gene content, supplementary genes are sometimes found, often arising from gene duplication. Mitochondrial ORFans (ORFs having no detectable homology and unknown function) were found in bivalve molluscs with Doubly Uniparental Inheritance (DUI) of mitochondria. In DUI animals, two mitochondrial lineages are present: one transmitted through females (F-type) and the other through males (M-type), each showing a specific and conserved ORF. The analysis of 34 mitochondrial major Unassigned Regions of Musculista senhousia F- and M-mtDNA allowed us to verify the presence of novel mitochondrial ORFs in this species and to compare them with ORFs from other species with ascertained DUI, with other bivalves and with animals showing new mitochondrial elements. Overall, 17 ORFans from nine species were analyzed for structure and function. Many clues suggest that the analyzed ORFans arose from endogenization of viral genes. The co-option of such novel genes by viral hosts may have determined some evolutionary aspects of host life cycle, possibly involving mitochondria. The structure similarity of DUI ORFans within evolutionary lineages may also indicate that they originated from independent events. If these novel ORFs are in some way linked to DUI establishment, a multiple origin of DUI has to be considered. These putative proteins may have a role in the maintenance of sperm mitochondria during embryo development, possibly masking them from the degradation processes that normally affect sperm mitochondria in species with strictly maternal inheritance.
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Affiliation(s)
- Liliana Milani
- Dipartimento di Scienze Biologiche, Geologiche ed Ambientali, University of Bologna, Bologna, Italy.
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19
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Tricarboxylic acid cycle-sustained oxidative phosphorylation in isolated myelin vesicles. Biochimie 2013; 95:1991-8. [DOI: 10.1016/j.biochi.2013.07.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 07/02/2013] [Indexed: 12/11/2022]
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20
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Feng MJ, Zhang L, Liu Z, Zhou P, Lu X. The expression and release of Hsp60 in 6-OHDA induced in vivo and in vitro models of Parkinson's disease. Neurochem Res 2013; 38:2180-9. [PMID: 23943523 DOI: 10.1007/s11064-013-1127-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 07/31/2013] [Accepted: 08/03/2013] [Indexed: 12/31/2022]
Abstract
In Parkinson's disease, dopaminergic neuron damage/death causes the release of soluble substances that are selectively toxic to neighboring/additional dopaminergic neurons through the activation of microglia. Hsp60 can be released from injured cells of central nervous system to activate microglia. However, its expression and role in Parkinson's disease has not been well understood. Here, we performed a 6-OHDA treated Parkinson's disease model in adult rats. Western blot analysis showed a time-course expression of Hsp60, which decreased gradually and then rose back. Immunofluorescence staining showed that Hsp60 was decreased in dopaminergic neuron, and most Hsp60 located on the surface of activated microglia. Furthermore, in cellular Parkinson's disease model, Hsp60 was obviously detected in the culture supernatants after 6-OHDA treatment, and a concomitant decrease in cell extracts. Taken together, our results suggested that Hsp60 could be released extracellularly to activate microglia in Parkinson's disease model.
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Affiliation(s)
- Mei jiang Feng
- Department of Geriatrics, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, 210011, Jiangsu, People's Republic of China,
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21
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Ravera S, Nobbio L, Visigalli D, Bartolucci M, Calzia D, Fiorese F, Mancardi G, Schenone A, Morelli A, Panfoli I. Oxydative phosphorylation in sciatic nerve myelin and its impairment in a model of dysmyelinating peripheral neuropathy. J Neurochem 2013; 126:82-92. [PMID: 23578247 DOI: 10.1111/jnc.12253] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 03/13/2013] [Accepted: 03/14/2013] [Indexed: 11/30/2022]
Abstract
Myelin sheath is the proteolipid membrane wrapping the axons of CNS and PNS. We have shown data suggesting that CNS myelin conducts oxidative phosphorylation (OXPHOS), challenging its role in limiting the axonal energy expenditure. Here, we focused on PNS myelin. Samples were: (i) isolated myelin vesicles (IMV) from sciatic nerves, (ii) mitochondria from primary Schwann cell cultures, and (iii) sciatic nerve sections, from wild type or Charcot-Marie-Tooth type 1A (CMT1A) rats. The latter used as a model of dys-demyelination. O₂ consumption and activity of OXPHOS proteins from wild type (Wt) or CMT1A sciatic nerves showed some differences. In particular, O₂ consumption by IMV from Wt and CMT1A 1-month-old rats was comparable, while it was severely impaired in IMV from adult affected animals. Mitochondria extracted from CMT1A Schwann cell did not show any dysfunction. Transmission electron microscopy studies demonstrated an increased mitochondrial density in dys-demyelinated axons, as to compensate for the loss of respiration by myelin. Confocal immunohistochemistry showed the expression of OXPHOS proteins in the myelin sheath, both in Wt and dys-demyelinated nerves. These revealed an abnormal morphology. Taken together these results support the idea that also PNS myelin conducts OXPHOS to sustain axonal function.
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22
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Campanella C, Bucchieri F, Merendino AM, Fucarino A, Burgio G, Corona DFV, Barbieri G, David S, Farina F, Zummo G, de Macario EC, Macario AJL, Cappello F. The odyssey of Hsp60 from tumor cells to other destinations includes plasma membrane-associated stages and Golgi and exosomal protein-trafficking modalities. PLoS One 2012; 7:e42008. [PMID: 22848686 PMCID: PMC3405006 DOI: 10.1371/journal.pone.0042008] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 07/02/2012] [Indexed: 11/18/2022] Open
Abstract
Background In a previous work we showed for the first time that human tumor cells secrete Hsp60 via exosomes, which are considered immunologically active microvesicles involved in tumor progression. This finding raised questions concerning the route followed by Hsp60 to reach the exosomes, its location in them, and whether Hsp60 can be secreted also via other mechanisms, e.g., by the Golgi. We addressed these issues in the work presented here. Principal Findings We found that Hsp60 localizes in the tumor cell plasma membrane, is associated with lipid rafts, and ends up in the exosomal membrane. We also found evidence that Hsp60 localizes in the Golgi apparatus and its secretion is prevented by an inhibitor of this organelle. Conclusions/Significance We propose a multistage process for the translocation of Hsp60 from the inside to the outside of the cell that includes a combination of protein traffic pathways and, ultimately, presence of the chaperonin in the circulating blood. The new information presented should help in designing future strategies for research and for developing diagnostic-monitoring means useful in clinical oncology.
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Affiliation(s)
- Claudia Campanella
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
- Istituto Euro-Mediterraneo di Scienza e Tecnologia, Palermo, Italy
| | - Fabio Bucchieri
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
- Istituto Euro-Mediterraneo di Scienza e Tecnologia, Palermo, Italy
| | - Anna M. Merendino
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
| | - Alberto Fucarino
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
| | - Giosalba Burgio
- Dipartimento STEMBIO, University of Palermo, Palermo, Italy
- Dulbecco Telethon Institute, Palermo, Italy
| | - Davide F. V. Corona
- Dipartimento STEMBIO, University of Palermo, Palermo, Italy
- Dulbecco Telethon Institute, Palermo, Italy
| | - Giovanna Barbieri
- Istituto di Biomedicina e Immunologia Molecolare, C.N.R., Palermo, Italy
| | - Sabrina David
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
| | - Felicia Farina
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
| | - Giovanni Zummo
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
| | - Everly Conway de Macario
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore, and IMET, Baltimore, Maryland, United States of America
| | - Alberto J. L. Macario
- Istituto Euro-Mediterraneo di Scienza e Tecnologia, Palermo, Italy
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore, and IMET, Baltimore, Maryland, United States of America
| | - Francesco Cappello
- Dipartimento BIONEC, Sezione di Anatomia Umana, University of Palermo, Palermo, Italy
- Istituto Euro-Mediterraneo di Scienza e Tecnologia, Palermo, Italy
- * E-mail:
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Hu Z, Fan Z, Zhao Z, Chen J, Li J. Stable expression of antibiotic-resistant gene ble from Streptoalloteichus hindustanus in the mitochondria of Chlamydomonas reinhardtii. PLoS One 2012; 7:e35542. [PMID: 22530046 PMCID: PMC3328454 DOI: 10.1371/journal.pone.0035542] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 03/19/2012] [Indexed: 11/18/2022] Open
Abstract
The mitochondrial expression of exogenous antibiotic resistance genes has not been demonstrated successfully to date, which has limited the development of antibiotic resistance genes as selectable markers for mitochondrial site-directed transformation in Chlamydomonas reinhardtii. In this work, the plasmid pBSLPNCB was constructed by inserting the gene ble of Streptoalloteichus hindustanus (Sh ble), encoding a small (14-kilodalton) protective protein into the site between TERMINVREP-Left repeats and the cob gene in a fragment of mitochondrial DNA (mtDNA) of C. reinhardtii. The fusion DNA-construct, which contained TERMINVREP-Left, Sh ble, cob, and partial nd4 sequence, were introduced into the mitochondria of the respiratory deficient dum-1 mutant CC-2654 of C. reinhardtii by biolistic particle delivery system. A large number of transformants were obtained after eight weeks in the dark. Subsequent subculture of the transformants on the selection TAP media containing 3 ìg/mL Zeomycin for 12 months resulted in genetically modified transgenic algae MT-Bs. Sequencing and Southern analyses on the mitochondrial genome of the different MT-B lines revealed that Sh ble gene had been integrated into the mitochondrial genome of C. reinhardtii. Both Western blot, using the anti-BLE monoclonal antibody, and Zeomycin tolerance analysis confirmed the presence of BLE protein in the transgenic algal cells. It indicates that the Sh ble gene can be stably expressed in the mitochondria of C. reinhardtii.
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Affiliation(s)
- Zhangli Hu
- Shenzhen Key Laboratory of Marine Bioresource and Eco-environmental Science, College of Life Science, Shenzhen University, Shenzhen, People's Republic of China.
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Sun W, Wang L, Jiang H, Chen D, Murchie AI. Targeting mitochondrial transcription in fission yeast with ETB, an inhibitor of HSP60, the chaperone that binds to the mitochondrial transcription factor Mtf1. Genes Cells 2012; 17:122-31. [DOI: 10.1111/j.1365-2443.2011.01578.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sabirov RZ, Merzlyak PG. Plasmalemmal VDAC controversies and maxi-anion channel puzzle. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1818:1570-80. [PMID: 21986486 DOI: 10.1016/j.bbamem.2011.09.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 09/22/2011] [Accepted: 09/23/2011] [Indexed: 12/14/2022]
Abstract
The maxi-anion channel has been observed in many cell types from the very beginning of the patch-clamp era. The channel is highly conductive for chloride and thus can modulate the resting membrane potential and play a role in fluid secretion/absorption and cell volume regulation. A wide nanoscopic pore of the maxi-anion channel permits passage of excitatory amino acids and nucleotides. The channel-mediated release of these signaling molecules is associated with kidney tubuloglomerular feedback, cardiac ischemia/hypoxia, as well as brain ischemia/hypoxia and excitotoxic neurodegeneration. Despite the ubiquitous expression and physiological/pathophysiological significance, the molecular identity of the maxi-anion channel is still obscure. VDAC is primarily a mitochondrial protein; however several groups detected it on the cellular surface. VDAC in lipid bilayers reproduced the most important biophysical properties of the maxi-anion channel, such as a wide nano-sized pore, closure in response to moderately high voltages, ATP-block and ATP-permeability. However, these similarities turned out to be superficial, and the hypothesis of plasmalemmal VDAC as the maxi-anion channel did not withstand the test by genetic manipulations of VDAC protein expression. VDAC on the cellular surface could also function as a ferricyanide reductase or a receptor for plasminogen kringle 5 and for neuroactive steroids. These ideas, as well as the very presence of VDAC on plasmalemma, remain to be scrutinized by genetic manipulations of the VDAC protein expression. This article is part of a Special Issue entitled: VDAC structure, function, and regulation of mitochondrial metabolism.
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Affiliation(s)
- Ravshan Z Sabirov
- Laboratory of Molecular Physiology, Institute of Pysiology and Biphysics, Academy of Science, RUz, Tashkent, Uzbekistan.
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Cappello F, de Macario EC, Zummo G, Macario AJL. Immunohistochemistry of human Hsp60 in health and disease: from autoimmunity to cancer. Methods Mol Biol 2011; 787:245-54. [PMID: 21898240 DOI: 10.1007/978-1-61779-295-3_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Hsp60 (also called Cpn60) is a chaperonin with essential functions for cell physiology and survival. Additionally, its involvement in the pathogenesis of a number of diseases (e.g., some autoimmune disorders and cancer) is becoming evident with new research. For example, the distribution and levels of Hsp60 in cells and tissues have been found altered in many pathologic conditions, and the significance of these alterations is being investigated in a number of laboratories. The aim of this ongoing research is to determine the meaning of these Hsp60 alterations with regard to pathogenetic mechanisms, diagnosis, classification of lesions, and assessing of prognosis and response to treatment. Hsp60 occurs in the mitochondria, i.e., its typical residence according to classic knowledge, and also in other locales, such as the cytosol, the cell membrane, the intercellular space, and biological fluids (e.g., blood and cerebrospinal fluid). Detection and quantitative determinations in all these locations are becoming essential components of laboratory pathology in clinics and research. Consequently, immunohistochemistry targeting Hsp60 is also becoming essential for pathologists and researchers interested in disorders involving this chaperonin. In this chapter, we briefly summarize some recent discoveries on the participation of Hsp60 in the pathogenesis of human diseases and describe in detail how to perform immunohistochemical reactions for detecting the chaperonin, determining its location, and measuring its levels of expression.
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Affiliation(s)
- Francesco Cappello
- Department of Experimental Biomedicine and Clinical Neuroscience, University of Palermo, Palermo, Italy.
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Ravera S, Aluigi MG, Calzia D, Ramoino P, Morelli A, Panfoli I. Evidence for Ectopic Aerobic ATP Production on C6 Glioma Cell Plasma Membrane. Cell Mol Neurobiol 2010; 31:313-21. [DOI: 10.1007/s10571-010-9624-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Accepted: 10/20/2010] [Indexed: 01/26/2023]
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Abstract
Microglial activation is an early response to brain ischemia and many other stressors. Microglia continuously monitor and respond to changes in brain homeostasis and to specific signaling molecules expressed or released by neighboring cells. These signaling molecules, including ATP, glutamate, cytokines, prostaglandins, zinc, reactive oxygen species, and HSP60, may induce microglial proliferation and migration to the sites of injury. They also induce a nonspecific innate immune response that may exacerbate acute ischemic injury. This innate immune response includes release of reactive oxygen species, cytokines, and proteases. Microglial activation requires hours to days to fully develop, and thus presents a target for therapeutic intervention with a much longer window of opportunity than acute neuroprotection. Effective agents are now available for blocking both microglial receptor activation and the microglia effector responses that drive the inflammatory response after stroke. Effective agents are also available for targeting the signal transduction mechanisms linking these events. However, the innate immune response can have beneficial as well deleterious effects on outcome after stoke, and a challenge will be to find ways to selectively suppress the deleterious effects of microglial activation after stroke without compromising neurovascular repair and remodeling.
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Affiliation(s)
- Midori A. Yenari
- Department of Neurology, University of California San Francisco and San Francisco Veterans Affairs Medical Center, 94121 San Francisco, California
| | - Tiina M. Kauppinen
- Department of Neurology, University of California San Francisco and San Francisco Veterans Affairs Medical Center, 94121 San Francisco, California
| | - Raymond A. Swanson
- Department of Neurology, University of California San Francisco and San Francisco Veterans Affairs Medical Center, 94121 San Francisco, California
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Castilla C, Congregado B, Conde JM, Medina R, Torrubia FJ, Japón MA, Sáez C. Immunohistochemical expression of Hsp60 correlates with tumor progression and hormone resistance in prostate cancer. Urology 2010; 76:1017.e1-6. [PMID: 20708221 DOI: 10.1016/j.urology.2010.05.045] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 05/07/2010] [Accepted: 05/23/2010] [Indexed: 01/08/2023]
Abstract
OBJECTIVES To investigate the expression of Hsp60 protein in prostate cancer biopsy samples, and its association with prognostic clinical parameters and hormone resistance and survival. Molecular chaperones are involved in protein folding, protein degradation, and protein trafficking among subcellular compartments. METHODS We selected 107 patients with localized and locally advanced prostate cancer at our hospital from 1999 through 2004. We performed an analysis by western blot and immunohistochemistry on paraffin-embedded tissue sections. Clinical data were used to determine associations between immunohistochemical expression of Hsp60 and tumor behavior. RESULTS The expression level of Hsp60 was significantly increased in tumors with high Gleason score (P < .001). Hsp60 expression was also significantly associated with initial serum PSA levels (P < .01) and with the presence of lymph node metastasis (P < .003). In 50 locally advanced cancers treated by androgen ablation we found an association between high Hsp60-expressing tumors and an early onset of hormone refractory disease (P < .02) and reduced cancer-specific survival (P < .05). CONCLUSIONS Hsp60 protein is overexpressed in poorly differentiated prostate cancers. Hsp60 expression is strongly associated with prognostic clinical parameters, such as Gleason score, initial serum PSA levels, and lymph node metastasis and with the onset of hormone-refractory disease and reduced cancer-specific survival. Identification of such markers could be of relevance in the clinical management of prostate cancer.
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Affiliation(s)
- Carolina Castilla
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Seville, Spain
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De Pinto V, Messina A, Lane DJ, Lawen A. Voltage-dependent anion-selective channel (VDAC) in the plasma membrane. FEBS Lett 2010; 584:1793-9. [DOI: 10.1016/j.febslet.2010.02.049] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Revised: 02/15/2010] [Accepted: 02/16/2010] [Indexed: 10/19/2022]
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Aqueous Polymer Two-phase Partition for The Proteomic Analysis of Plasma Membrane From Rat Dorsal Root Ganglion Neurons*. PROG BIOCHEM BIOPHYS 2009. [DOI: 10.3724/sp.j.1206.2009.00276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Xiong X, Huang S, Zhang H, Li J, Shen J, Xiong J, Lin Y, Jiang L, Wang X, Liang S. Enrichment and proteomic analysis of plasma membrane from rat dorsal root ganglions. Proteome Sci 2009; 7:41. [PMID: 19889238 PMCID: PMC2780401 DOI: 10.1186/1477-5956-7-41] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Accepted: 11/05/2009] [Indexed: 12/04/2022] Open
Abstract
Background Dorsal root ganglion (DRG) neurons are primary sensory neurons that conduct neuronal impulses related to pain, touch and temperature senses. Plasma membrane (PM) of DRG cells plays important roles in their functions. PM proteins are main performers of the functions. However, mainly due to the very low amount of DRG that leads to the difficulties in PM sample collection, few proteomic analyses on the PM have been reported and it is a subject that demands further investigation. Results By using aqueous polymer two-phase partition in combination with high salt and high pH washing, PMs were efficiently enriched, demonstrated by western blot analysis. A total of 954 non-redundant proteins were identified from the plasma membrane-enriched preparation with CapLC-MS/MS analysis subsequent to protein separation by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) or shotgun digestion. 205 (21.5%) of the identified proteins were unambiguously assigned as PM proteins, including a large number of signal proteins, receptors, ion channel and transporters. Conclusion The aqueous polymer two-phase partition is a simple, rapid and relatively inexpensive method. It is well suitable for the purification of PMs from small amount of tissues. Therefore, it is reasonable for the DRG PM to be enriched by using aqueous two-phase partition as a preferred method. Proteomic analysis showed that DRG PM was rich in proteins involved in the fundamental biological processes including material exchange, energy transformation and information transmission, etc. These data would help to our further understanding of the fundamental DRG functions.
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Affiliation(s)
- Xia Xiong
- Hunan Normal University, Changsha, PR China.
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Cappello F, Conway de Macario E, Di Felice V, Zummo G, Macario AJL. Chlamydia trachomatis infection and anti-Hsp60 immunity: the two sides of the coin. PLoS Pathog 2009; 5:e1000552. [PMID: 19714222 PMCID: PMC2726942 DOI: 10.1371/journal.ppat.1000552] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Chlamydia trachomatis (CT) infection is one of the most common causes of reproductive tract diseases and infertility. CT-Hsp60 is synthesized during infection and is released in the bloodstream. As a consequence, immune cells will produce anti-CT-Hsp60 antibodies. Hsp60, a ubiquitous and evolutionarily conserved chaperonin, is normally sequestered inside the cell, particularly into mitochondria. However, upon cell stress, as well as during carcinogenesis, the chaperonin becomes exposed on the cell surface (sf-Hsp60) and/or is secreted from cells into the extracellular space and circulation. Reports in the literature on circulating Hsp and anti-Hsp antibodies are in many cases short on details about Hsp60 concentrations, and about the specificity spectra of the antibodies, their titers, and their true, direct, pathogenetic effects. Thus, more studies are still needed to obtain a definitive picture on these matters. Nevertheless, the information already available indicates that the concurrence of persistent CT infection and appearance of sf-Hsp60 can promote an autoimmune aggression towards stressed cells and the development of diseases such as autoimmune arthritis, multiple sclerosis, atherosclerosis, vasculitis, diabetes, and thyroiditis, among others. At the same time, immunocomplexes composed of anti-CT-Hsp60 antibodies and circulating Hsp60 (both CT and human) may form deposits in several anatomical locations, e.g., at the glomerular basal membrane. The opposite side of the coin is that pre-tumor and tumor cells with sf-Hsp60 can be destroyed with participation of the anti-Hsp60 antibody, thus stopping cancer progression before it is even noticed by the patient or physician.
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Affiliation(s)
- Francesco Cappello
- Dipartimento di Medicina Sperimentale, Sezione di Anatomia Umana Emerico Luna, Università degli Studi di Palermo, Palermo, Italy.
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Stefano L, Racchetti G, Bianco F, Passini N, Gupta RS, Panina Bordignon P, Meldolesi J. The surface-exposed chaperone, Hsp60, is an agonist of the microglial TREM2 receptor. J Neurochem 2009; 110:284-94. [PMID: 19457124 DOI: 10.1111/j.1471-4159.2009.06130.x] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Triggering receptor expressed in myeloid (TREM) cells 2, a receptor expressed by myeloid cells, osteoclasts and microglia, is known to play a protective role in bones and brain. Mutations of the receptor (or of its coupling protein, DAP12) sustain in fact a genetic disease affecting the two organs, the polycystic lipomembraneous osteodysplasia with sclerosing leukoencephalopathy (PLOSL or Nasu-Hakola disease). So far, specific agonist(s) of TREM2 have not been identified and its (their) transduction mechanisms are largely unknown. Heat shock protein 60 (Hsp60) is a mitochondrial chaperone that can also be harboured at the cell surface. By using constructs including the extracellular domain of TREM2 and the Fc domain of IgGs we have identified Hsp60 as the only TREM2-binding protein exposed at the surface of neuroblastoma N2A cells and astrocytes, and lacking in U373 astrocytoma. Treatment with Hsp60 was found to stimulate the best known TREM2-dependent process, phagocytosis, however, only in the microglial N9 cells rich in the receptor. Upon TREM2 down-regulation, the Hsp60-induced stimulation of N9 phagocytosis was greatly attenuated. Hsp60 is also released by many cell types, segregated within exosomes or shedding vesicles which might then undergo dissolution. However, the affinity of its binding (K(d) = 3.8 microM) might be too low for the soluble chaperone released from the vesicles to the extracellular space to induce a significant activation of TREM2. It might in contrast be appropriate for the binding of TREM2 to Hsp60 exposed at the surface of cells closely interacting with microglia. The ensuing stimulation of phagocytosis could play protective effects on the brain.
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Affiliation(s)
- Luisa Stefano
- Vita-Salute San Raffaele University, Center of Excellence in Cell Development, Milan, Italy
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Kang SM, Kim SJ, Kim JH, Lee W, Kim GW, Lee KH, Choi KY, Oh JW. Interaction of hepatitis C virus core protein with Hsp60 triggers the production of reactive oxygen species and enhances TNF-alpha-mediated apoptosis. Cancer Lett 2009; 279:230-7. [PMID: 19264393 DOI: 10.1016/j.canlet.2009.02.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2008] [Revised: 02/01/2009] [Accepted: 02/02/2009] [Indexed: 12/20/2022]
Abstract
The hepatitis C virus (HCV) core protein is the primary protein component of the nucleocapsid that encapsidates the viral RNA genome. Besides its role as a viral structural protein, the core protein is implicated in HCV chronic infection-associated liver diseases by induction of reactive oxygen species (ROS) production and modulation of apoptosis. Here, we show that interaction of the core protein, through its N-terminal domain (amino acids 1-75), with heat shock protein (Hsp60) is critical for the induction of ROS production, leading to sensitization of core protein-expressing cells to apoptosis induced by tumor necrosis factor-alpha (TNF-alpha). Moreover, overexpression of Hsp60 rescued the core protein-expressing cells from cell death by reducing ROS production. Collectively, our results suggest that impairment of Hsp60 function through binding of HCV core protein contributes to HCV viral pathogenesis by ROS generation and amplification of the apoptotic effect of TNF-alpha.
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Affiliation(s)
- Su-Min Kang
- Department of Biotechnology, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
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Li XL, Li K, Li YY, Feng Y, Gong Q, Li YN, Li XJ, Chen CJ. Alteration of Cpn60 expression in pancreatic tissue of rats with acute pancreatitis. Cell Stress Chaperones 2009; 14:199-206. [PMID: 18766470 PMCID: PMC2727985 DOI: 10.1007/s12192-008-0074-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2008] [Revised: 08/04/2008] [Accepted: 08/06/2008] [Indexed: 01/30/2023] Open
Abstract
The expression of heat-shock protein 60 (also known as chaperonin 60, Cpn60) in experimental acute pancreatitis (AP) is considered to play an active role in the prevention of abnormal enzyme accumulation and activation in pancreatic acinar cells. However, there are controversial results in the literature regarding the relationship between the abnormality of Cpn60 expression and AP onset and development. The purpose of this study was to investigate the alternations of Cpn60 expression and the relationship between the abnormal expression of Cpn60 and AP progression in rat severe acute pancreatitis (SAP) models. In this report, we induced SAP in Sprague-Dawley (SD) rats by reverse injection of sodium deoxycholate into the pancreatic duct, and examined the dynamic changes of Cpn60 expression in pancreatic tissues from different time points and at different levels with techniques of real-time PCR, western blotting, and immunohistochemistry. At 1 h after SAP induction, the expression of Cpn60 mRNA in the AP pancreatic tissues was higher than those in the sham-operation group and normal control group, but decreased sharply as the time period was extended, and there was a significant difference between 1 h and 10 h after SAP induction (p < 0.05). In the AP process, Cpn60 protein expression showed transient elevation as well, and the increased protein expression occurred predominantly in affected, but not totally destroyed, pancreatic acinar cells. As AP progressed, the pancreatic tissues were seriously damaged, leading to a decreased overall Cpn60 protein expression. Our results show a complex pattern of Cpn60 expression in pancreatic tissues of SAP rats, and the causality between the damage of pancreatic tissues and the decrease of Cpn60 level needs to be investigated further.
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Affiliation(s)
- Xue-Li Li
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Kun Li
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Yong-Yu Li
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Yan Feng
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Qian Gong
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Yan-Na Li
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Xue-Jin Li
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
| | - Chang-Jie Chen
- Institute of Digestive Disease, Medical School of Tongji University, 1239 Si Ping Road, Shanghai, 200092 People’s Republic of China
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Evidence for aerobic ATP synthesis in isolated myelin vesicles. Int J Biochem Cell Biol 2009; 41:1581-91. [PMID: 19401152 DOI: 10.1016/j.biocel.2009.01.009] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Revised: 12/15/2008] [Accepted: 01/14/2009] [Indexed: 11/23/2022]
Abstract
Even though brain represents only 2-3% of the body weight, it consumes 20% of total body oxygen, and 25% of total body glucose. This sounds surprising, in that mitochondrial density in brain is low, while mitochondria are thought to be the sole site of aerobic energy supply. These data would suggest that structures other than mitochondria are involved in aerobic ATP production. Considering that a sustained aerobic metabolism needs a great surface extension and that the oxygen solubility is higher in neutral lipids, we have focused our attention on myelin sheath, the multilayered membrane produced by oligodendrocytes, hypothesizing it to be an ATP production site. Myelin has long been supposed to augment the speed of conduction, however, there is growing evidence that it exerts an as yet unexplained neuro-trophic role. In this work, by biochemical assays, Western Blot analysis, confocal laser microscopy, we present evidence that isolated myelin vesicles (IMV) are able to consume O(2) and produce ATP through the operation of a proton gradient across their membranes. Living optic nerve sections were exposed to MitoTracker, a classical mitochondrial dye, by a technique that we have developed and it was found that structures closely resembling nerve axons were stained. By immunohistochemistry we show that ATP synthase and myelin basic protein colocalize on both IMV and optic nerves. The complex of data suggests that myelin sheath may be the site of oxygen absorption and aerobic metabolism for the axons.
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Horiguchi Y, Araki M, Motojima K. Identification and characterization of the ER/lipid droplet-targeting sequence in 17beta-hydroxysteroid dehydrogenase type 11. Arch Biochem Biophys 2008; 479:121-30. [PMID: 18804447 DOI: 10.1016/j.abb.2008.08.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2008] [Revised: 08/23/2008] [Accepted: 08/25/2008] [Indexed: 10/21/2022]
Abstract
17beta-Hydroxysteroid dehydrogenase type 11 (17betaHSD11) is mostly localized on the endoplasmic reticulum (ER) membrane under normal conditions and redistributes to lipid droplets (LDs) when the formation of LDs is induced. In this study, confocal microscopy analyses of the subcellular localization of the mutated 17betaHSD11 proteins in cells with or without LDs revealed that both an N-terminal hydrophobic sequence and an adjacent sequence that has a weak homology with the PAT motif are independently necessary and both parts together (28 amino acid residues in total) are sufficient for the dual localization of 17betaHSD11. Mutation analyses suggest that the PAT-like motif in 17betaHSD11 will not be functionally similar to the canonical PAT motif. Hsp60 was identified as a possibly interacting protein with the PAT-like motif, and biochemical and microscopic analyses suggest that Hsp60 may be partly, but not necessarily involved in recognition of the PAT-like part of the targeting sequence of 17betaHSD11.
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Affiliation(s)
- Yuka Horiguchi
- Department of Biochemistry, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
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Deocaris CC, Kaul SC, Wadhwa R. From proliferative to neurological role of an hsp70 stress chaperone, mortalin. Biogerontology 2008; 9:391-403. [PMID: 18770009 DOI: 10.1007/s10522-008-9174-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2008] [Accepted: 08/18/2008] [Indexed: 12/21/2022]
Abstract
Although the brain makes up approximately 2% of a person's body weight, it consumes more than 15% of total cardiac output and has a per capita caloric requirement of 10 times more than the rest of the body. Such continuous metabolic demand that supports the generation of action potentials in neuronal cells relies on the mitochondria, the main organelle for power generation. The phenomenon of mitochondrial biogenesis, although has long been a neglected theme in neurobiology, can be regarded as critical to brain physiology. The present review emphasizes the role of a key molecular player of mitochondrial biogenesis, the mortalin/mthsp70. Brain mortalin is discussed in relation to its aptitude to impact on mitochondrial function and homeostasis, to its interfacing energy metabolic functions with synaptic plasticity, and to its modulation of brain aging via the cellular senescence pathways. Recently, this chaperone has been implicated in Alzheimer's (AD) and Parkinson's (PD) diseases, with proteomic studies consistently identifying oxidatively-damaged mortalin as potential biomarker. Hence, it is possible that mitochondrial dysfunction coincides with the collapse in the mitochondrial chaperone network that aim not only to import, sort and maintain integrity of protein components within the mitochondria, but also to act as buffer to the molecular heterogeneity of damaged and aging mitochondrial proteins within a ROS-rich microenvironment. Inversely, it may also seem that vulnerability to mitochondrial dysfunction could be precipitated by malevolent (anti-chaperone) gain-of-function of a 'sick mortalin'.
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Affiliation(s)
- Custer C Deocaris
- Institute of Health and Sports Science, University of Tsukuba, Ibaraki, 305-8574, Japan
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Wick MC, Mayerl C, Backovic A, van der Zee R, Jaschke W, Dietrich H, Wick G. In vivo imaging of the effect of LPS on arterial endothelial cells: molecular imaging of heat shock protein 60 expression. Cell Stress Chaperones 2008; 13:275-85. [PMID: 18465205 PMCID: PMC2673942 DOI: 10.1007/s12192-008-0044-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 03/26/2008] [Accepted: 03/31/2008] [Indexed: 12/01/2022] Open
Abstract
Bacterial endotoxins are known as stress factors for endothelial cells. In 20 normocholesterolemic New Zealand White (NZW) rabbits, endothelial stress was induced by intravenous (i.v.) injection of lipopolysaccharide (LPS), while eight NZW rabbits were sham-treated or served as untreated controls. In vivo molecular imaging was performed using co-registered computer tomography and positron emission tomography 24 h after i.v. injection of (124)I-labeled monoclonal anti-HSP60 or (124)I-radiolabelled isotype control antibodies. Compared to control animals, in vivo images of rabbit aortae revealed significantly increased endothelial binding of (124)I-labeled anti-HSP60 antibodies upon LPS, especially at sites of aortal branching. This was confirmed by immunohistochemistry and autoradiography data. Our results showed, as proof-of-principle, that HSP60-expression in normocholesterolemic rabbits is significantly increased after induction of endothelial stress and that non-invasive in vivo molecular imaging of early aortal HSP60-expression using (124)I-labeled anti-HSP60 monoclonal antibodies is possible.
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Affiliation(s)
- Marius C Wick
- Department of Radiology, Innsbruck Medical University, Anichstrasse 35, Innsbruck, Austria.
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Wick MC, Kremser C, Frischauf S, Wick G. In vivo molecular imaging of vascular stress. Cell Stress Chaperones 2008; 13:263-73. [PMID: 18465206 PMCID: PMC2673941 DOI: 10.1007/s12192-008-0043-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Accepted: 03/31/2008] [Indexed: 12/31/2022] Open
Abstract
Noninvasive in vivo imaging is an emerging specialty in experimental radiology aiming at developing hardware and appropriate contrast agents to visualize the molecular basis and pathophysiological processes of many pathological conditions, including atherosclerosis. The list of potentially useful tracers and targets for in vivo molecular imaging in the cascade of early atherosclerotic events has been narrowed down to some very promising endothelial factors, i.e., cell adhesion molecules, macrophages, apoptosis, lipoproteins, heat shock proteins, and others. In this review, we will update on the progress of recent developments in the field of noninvasive molecular imaging in experimental atherosclerosis.
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Affiliation(s)
- Marius C Wick
- Department of Radiology, Innsbruck Medical University, Anichstrasse 35, Innsbruck, Austria.
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42
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Ghosh JC, Dohi T, Kang BH, Altieri DC. Hsp60 Regulation of Tumor Cell Apoptosis. J Biol Chem 2008; 283:5188-94. [DOI: 10.1074/jbc.m705904200] [Citation(s) in RCA: 214] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Devenish RJ, Prescott M, Rodgers AJW. The structure and function of mitochondrial F1F0-ATP synthases. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2008; 267:1-58. [PMID: 18544496 DOI: 10.1016/s1937-6448(08)00601-1] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We review recent advances in understanding of the structure of the F(1)F(0)-ATP synthase of the mitochondrial inner membrane (mtATPase). A significant achievement has been the determination of the structure of the principal peripheral or stator stalk components bringing us closer to achieving the Holy Grail of a complete 3D structure for the complex. A major focus of the field in recent years has been to understand the physiological significance of dimers or other oligomer forms of mtATPase recoverable from membranes and their relationship to the structure of the cristae of the inner mitochondrial membrane. In addition, the association of mtATPase with other membrane proteins has been described and suggests that further levels of functional organization need to be considered. Many reports in recent years have concerned the location and function of ATP synthase complexes or its component subunits on the external surface of the plasma membrane. We consider whether the evidence supports complete complexes being located on the cell surface, the biogenesis of such complexes, and aspects of function especially related to the structure of mtATPase.
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Affiliation(s)
- Rodney J Devenish
- Department of Biochemistry and Molecular Biology, and ARC Centre of Excellence in Microbial Structural and Functional Genomics, Monash University, Clayton Campus, Victoria, 3800, Australia
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Yang JY, Yang MQ, Dunker AK, Deng Y, Huang X. Investigation of transmembrane proteins using a computational approach. BMC Genomics 2008; 9 Suppl 1:S7. [PMID: 18366620 PMCID: PMC2386072 DOI: 10.1186/1471-2164-9-s1-s7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND An important subfamily of membrane proteins are the transmembrane alpha-helical proteins, in which the membrane-spanning regions are made up of alpha-helices. Given the obvious biological and medical significance of these proteins, it is of tremendous practical importance to identify the location of transmembrane segments. The difficulty of inferring the secondary or tertiary structure of transmembrane proteins using experimental techniques has led to a surge of interest in applying techniques from machine learning and bioinformatics to infer secondary structure from primary structure in these proteins. We are therefore interested in determining which physicochemical properties are most useful for discriminating transmembrane segments from non-transmembrane segments in transmembrane proteins, and for discriminating intrinsically unstructured segments from intrinsically structured segments in transmembrane proteins, and in using the results of these investigations to develop classifiers to identify transmembrane segments in transmembrane proteins. RESULTS We determined that the most useful properties for discriminating transmembrane segments from non-transmembrane segments and for discriminating intrinsically unstructured segments from intrinsically structured segments in transmembrane proteins were hydropathy, polarity, and flexibility, and used the results of this analysis to construct classifiers to discriminate transmembrane segments from non-transmembrane segments using four classification techniques: two variants of the Self-Organizing Global Ranking algorithm, a decision tree algorithm, and a support vector machine algorithm. All four techniques exhibited good performance, with out-of-sample accuracies of approximately 75%. CONCLUSIONS Several interesting observations emerged from our study: intrinsically unstructured segments and transmembrane segments tend to have opposite properties; transmembrane proteins appear to be much richer in intrinsically unstructured segments than other proteins; and, in approximately 70% of transmembrane proteins that contain intrinsically unstructured segments, the intrinsically unstructured segments are close to transmembrane segments.
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Affiliation(s)
- Jack Y Yang
- Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Mary Qu Yang
- National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - A Keith Dunker
- Center for Computational Biology and Bioinformatics, Indiana University Schools of Medicine and Informatics, 410 W. 10th Street, Indianapolis, IN 46202, USA
| | - Youping Deng
- Department of Biological Sciences, University of Southern Mississippi, Hattiesburg, 39406, USA
| | - Xudong Huang
- Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
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Lin L, Kim SC, Wang Y, Gupta S, Davis B, Simon SI, Torre-Amione G, Knowlton AA. HSP60 in heart failure: abnormal distribution and role in cardiac myocyte apoptosis. Am J Physiol Heart Circ Physiol 2007; 293:H2238-47. [PMID: 17675567 DOI: 10.1152/ajpheart.00740.2007] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Heat shock protein (HSP) 60 is a mitochondrial and cytosolic protein. Previously, we reported that HSP60 doubled in end-stage heart failure, even though levels of the protective HSP72 were unchanged. Furthermore, we observed that acute injury in adult cardiac myocytes resulted in movement of HSP60 to the plasma membrane. We hypothesized that the inflammatory state of heart failure would cause translocation of HSP60 to the plasma membrane and that this would provide a pathway for cardiac injury. Two models were used to test this hypothesis: 1) a rat model of heart failure and 2) human explanted failing hearts. We found that HSP60 localized to the plasma membrane and was also found in the plasma early in heart failure. Plasma membrane HSP60 localized to lipid rafts and was detectable on the cell surface with the use of both flow cytometry and confocal microscopy. Localization of HSP60 to the cell surface correlated with increased apoptosis. In heart failure, HSP60 is in the plasma membrane fraction, on the cell surface, and in the plasma. Membrane HSP60 correlated with increased apoptosis. Release of HSP60 may activate the innate immune system, promoting a proinflammatory state, including an increase in TNF-alpha. Thus abnormal trafficking of HSP60 to the cell surface may be an early trigger for myocyte loss and the progression of heart failure.
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Affiliation(s)
- Li Lin
- Molecular and Cellular Cardiology, Cardiovascular Division, University of California, Davis, California 95616, USA
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Kurzik-Dumke U, Czaja J. Htid-1, the human homolog of the Drosophila melanogaster l(2)tid tumor suppressor, defines a novel physiological role of APC. Cell Signal 2007; 19:1973-85. [PMID: 17588722 DOI: 10.1016/j.cellsig.2007.05.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Revised: 04/17/2007] [Accepted: 05/18/2007] [Indexed: 12/21/2022]
Abstract
Htid-1, the human counterpart of the Drosophila tumor suppressor gene lethal(2)tumorous imaginal discs (l(2)tid) encodes three splice forms translated into three cytosolic - Tid50, Tid48 and Tid46 - and three mitochondrial - Tid43, Tid40 and Tid38 - proteins. Here we provide evidence for the association of the endogenous Tid50/Tid48 proteins with the adenomatous polyposis coli (APC) tumor suppressor in normal colon epithelium, colorectal cancer cells and mouse NIH3T3 fibroblasts. Using the Glutathione S-transferase binding assay we show that the N-terminal region including the Armadillo domain (ARM) of APC is sufficient to bind the Tid molecules. Using immunoprecipitation and confocal microscopy we show that the two molecular partners complex at defined areas of the cells with further proteins such as Hsp70, Hsc70, Actin, Dvl and Axin. Our data implicate that the formation of the complex is not associated with APC's involvement in beta-Catenin degradation. Furthermore, though it is linked to Actin it is neither associated with regulation of Actin cytoskeleton due to APC's binding to Asef nor to Tid's binding to Ras-GAP. We suggest that the novel complex acts in maintaining APC's availability for its distinct roles in the Wnt signaling important for the cell to take the right decision, either to switch the cascade OFF or ON, thus, to regulate the onset of proliferation of the cells.
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Affiliation(s)
- Ursula Kurzik-Dumke
- Institute of Medical Microbiology and Hygiene, Laboratory for Comparative Tumor Biology, Johannes Gutenberg University, Obere Zahlbacher Strasse 63, 55131 Mainz, Germany.
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Sakai H, Shen X, Koga T, Park BC, Noskina Y, Tibudan M, Yue BYJT. Mitochondrial association of myocilin, product of a glaucoma gene, in human trabecular meshwork cells. J Cell Physiol 2007; 213:775-84. [PMID: 17516541 DOI: 10.1002/jcp.21147] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The trabecular meshwork (TM), an ocular tissue next to the cornea, is a major site for regulation of the aqueous humor outflow. Malfunctioning of this tissue is believed to be responsible for development of glaucoma, a major blinding disease. Myocilin is a gene directly linked to the most common form of glaucoma. Its protein product has been localized to both intra- and extra-cellular sites in TM cells. This study was to investigate the association of myocilin with mitochondria in TM cells. In vitro mitochondrial import assays showed that myocilin was imported to the TM mitochondria, targeting to mitochondrial membranes and/or the intermembrane space. The targeting was mediated mostly via the amino-terminal region of myocilin. When myocilin expression was induced either by treatment with dexamethasone or transfection with a myocilin construct, the mitochondrial membrane potential in TM cells, as assessed by JC-1 staining, was lowered. Subcellular fractionation and Western blot analyses confirmed that a portion of myocilin sedimented with the mitochondrial fractions. Upon anti-Fas treatment to provoke apoptosis, an increase of myocilin distribution in cytosolic fraction was observed, suggesting that myocilin was partially released from mitochondrial compartments. These results confirmed the association of myocilin with TM cell mitochondria and indicated that myocilin may have a proapoptotic role in TM cells.
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Affiliation(s)
- Hiroshi Sakai
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago College of Medicine, Chicago, Illinois 60612, USA
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Bowes T, Singh B, Gupta RS. Subcellular localization of fumarase in mammalian cells and tissues. Histochem Cell Biol 2006; 127:335-46. [PMID: 17111171 DOI: 10.1007/s00418-006-0249-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/16/2006] [Indexed: 11/29/2022]
Abstract
Fumarase, a mitochondrial matrix protein, is previously indicated to be present in substantial amounts in the cytosol as well. However, recent studies show that newly synthesized human fumarase is efficiently imported into mitochondria with no detectable amount in the cytosol. To clarify its subcellular localization, the subcellular distribution of fumarase in mammalian cells/tissues was examined by a number of different methods. Cell fractionation using either a mitochondria fraction kit or extraction with low concentrations of digitonin, detected no fumarase in a 100,000 g supernatant fraction. Immunofluorescence labeling with an affinity-purified antibody to fumarase and an antibody to the mitochondrial Hsp60 protein showed identical labeling pattern with labeling seen mainly in mitochondria. Detailed studies were performed using high-resolution immunogold electron microscopy to determine the subcellular localization of fumarase in rat tissues, embedded in LR White resin. In thin sections from kidney, liver, heart, adrenal gland and anterior pituitary, strong and specific labeling due to fumarase antibody was only detected in mitochondria. However, in the pancreatic acinar cells, in addition to mitochondria, highly significant labeling was also observed in the zymogen granules and endoplasmic reticulum. The observed labeling in all cases was completely abolished upon omission of the primary antibody indicating that it was specific. In a western blot of purified zymogen granules, a fumarase-antibody cross-reactive protein of the same molecular mass as seen in the mitochondria was present. These results provide evidence that fumarase in mammalian cells/tissues is mainly localized in mitochondria and significant amounts of this protein are not present in the cytosol. However, these studies also reveal that in certain tissues, in addition to mitochondria, this protein is also present at specific extramitochondrial sites. Although the cellular function of fumarase at these extramitochondrial locations is not known, the appearance/localization of fumarase outside mitochondria may help explain how mutations in this mitochondrial protein can give rise to a number of different types of cancers.
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Affiliation(s)
- Timothy Bowes
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada, L8N 3Z5
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Sharma S, Reddy P, Rohilla MS, Tiwari P. Expression of HSP60 homologue in sheep blowfly Lucilia cuprina during development and heat stress. J Therm Biol 2006. [DOI: 10.1016/j.jtherbio.2006.05.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Singh B, Gupta RS. Mitochondrial import of human and yeast fumarase in live mammalian cells: Retrograde translocation of the yeast enzyme is mainly caused by its poor targeting sequence. Biochem Biophys Res Commun 2006; 346:911-8. [PMID: 16774737 DOI: 10.1016/j.bbrc.2006.05.188] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Accepted: 05/31/2006] [Indexed: 10/24/2022]
Abstract
Studies on yeast fumarase provide the main evidence for dual localization of a protein in mitochondria and cytosol by means of retrograde translocation. We have examined the subcellular targeting of yeast and human fumarase in live cells to identify factors responsible for this. The cDNAs for mature yeast or human fumarase were fused to the gene for enhanced green fluorescent protein (eGFP) and they contained, at their N-terminus, a mitochondrial targeting sequence (MTS) derived from either yeast fumarase, human fumarase, or cytochrome c oxidase subunit VIII (COX) protein. Two nuclear localization sequences (2x NLS) were also added to these constructs to facilitate detection of any cytosolic protein by its targeting to nucleus. In Cos-1 cells transfected with these constructs, human fumarase with either the native or COX MTSs was detected exclusively in mitochondria in >98% of the cells, while the remainder 1-2% of the cells showed varying amounts of nuclear labeling. In contrast, when human fumarase was fused to the yeast MTS, >50% of the cells showed nuclear labeling. Similar studies with yeast fumarase showed that with its native MTS, nuclear labeling was seen in 80-85% of the cells, but upon fusion to either human or COX MTS, nuclear labeling was observed in only 10-15% of the cells. These results provide evidence that extramitochondrial presence of yeast fumarase is mainly caused by the poor mitochondrial targeting characteristics of its MTS (but also affected by its primary sequence), and that the retrograde translocation mechanism does not play a significant role in the extramitochondrial presence of mammalian fumarase.
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Affiliation(s)
- Bhag Singh
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada L8N 3Z5
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