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Parente R, Possetti V, Schiavone ML, Campodoni E, Menale C, Loppini M, Doni A, Bottazzi B, Mantovani A, Sandri M, Tampieri A, Sobacchi C, Inforzato A. 3D Cocultures of Osteoblasts and Staphylococcus aureus on Biomimetic Bone Scaffolds as a Tool to Investigate the Host-Pathogen Interface in Osteomyelitis. Pathogens 2021; 10:pathogens10070837. [PMID: 34357987 PMCID: PMC8308613 DOI: 10.3390/pathogens10070837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/25/2021] [Accepted: 06/29/2021] [Indexed: 12/19/2022] Open
Abstract
Osteomyelitis (OM) is an infectious disease of the bone primarily caused by the opportunistic pathogen Staphylococcus aureus (SA). This Gram-positive bacterium has evolved a number of strategies to evade the immune response and subvert bone homeostasis, yet the underlying mechanisms remain poorly understood. OM has been modeled in vitro to challenge pathogenetic hypotheses in controlled conditions, thus providing guidance and support to animal experimentation. In this regard, traditional 2D models of OM inherently lack the spatial complexity of bone architecture. Three-dimensional models of the disease overcome this limitation; however, they poorly reproduce composition and texture of the natural bone. Here, we developed a new 3D model of OM based on cocultures of SA and murine osteoblastic MC3T3-E1 cells on magnesium-doped hydroxyapatite/collagen I (MgHA/Col) scaffolds that closely recapitulate the bone extracellular matrix. In this model, matrix-dependent effects were observed in proliferation, gene transcription, protein expression, and cell–matrix interactions both of the osteoblastic cell line and of bacterium. Additionally, these had distinct metabolic and gene expression profiles, compared to conventional 2D settings, when grown on MgHA/Col scaffolds in separate monocultures. Our study points to MgHA/Col scaffolds as biocompatible and bioactive matrices and provides a novel and close-to-physiology tool to address the pathogenetic mechanisms of OM at the host–pathogen interface.
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Affiliation(s)
- Raffaella Parente
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
| | - Valentina Possetti
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
| | - Maria Lucia Schiavone
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
- National Research Council-Institute for Genetic and Biomedical Research (CNR-IRGB), Milan Unit, 20089 Rozzano, Italy;
| | - Elisabetta Campodoni
- National Research Council-Institute of Science and Technology for Ceramics (CNR-ISTEC), 48018 Faenza, Italy; (E.C.); (M.S.); (A.T.)
| | - Ciro Menale
- National Research Council-Institute for Genetic and Biomedical Research (CNR-IRGB), Milan Unit, 20089 Rozzano, Italy;
- Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80131 Naples, Italy
| | - Mattia Loppini
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
- Department of Biomedical Sciences, Humanitas University, 20072 Pieve Emanuele, Italy
| | - Andrea Doni
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
| | - Barbara Bottazzi
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
| | - Alberto Mantovani
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
- Department of Biomedical Sciences, Humanitas University, 20072 Pieve Emanuele, Italy
- The William Harvey Research Institute, Queen Mary University of London, London E1 4NS, UK
| | - Monica Sandri
- National Research Council-Institute of Science and Technology for Ceramics (CNR-ISTEC), 48018 Faenza, Italy; (E.C.); (M.S.); (A.T.)
| | - Anna Tampieri
- National Research Council-Institute of Science and Technology for Ceramics (CNR-ISTEC), 48018 Faenza, Italy; (E.C.); (M.S.); (A.T.)
- National Research Council-Institute of Nanostructured Material (CNR-ISMN), 40129 Bologna, Italy
| | - Cristina Sobacchi
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
- National Research Council-Institute for Genetic and Biomedical Research (CNR-IRGB), Milan Unit, 20089 Rozzano, Italy;
- Correspondence: (C.S.); (A.I.); Tel.: +39-028-224-5153 (C.S.); +39-028-224-5132 (A.I.)
| | - Antonio Inforzato
- IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy; (R.P.); (V.P.); (M.L.S.); (M.L.); (A.D.); (B.B.); (A.M.)
- Department of Biomedical Sciences, Humanitas University, 20072 Pieve Emanuele, Italy
- Correspondence: (C.S.); (A.I.); Tel.: +39-028-224-5153 (C.S.); +39-028-224-5132 (A.I.)
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Balmer EA, Faso C. The Road Less Traveled? Unconventional Protein Secretion at Parasite-Host Interfaces. Front Cell Dev Biol 2021; 9:662711. [PMID: 34109175 PMCID: PMC8182054 DOI: 10.3389/fcell.2021.662711] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/07/2021] [Indexed: 01/01/2023] Open
Abstract
Protein secretion in eukaryotic cells is a well-studied process, which has been known for decades and is dealt with by any standard cell biology textbook. However, over the past 20 years, several studies led to the realization that protein secretion as a process might not be as uniform among different cargos as once thought. While in classic canonical secretion proteins carry a signal sequence, the secretory or surface proteome of several organisms demonstrated a lack of such signals in several secreted proteins. Other proteins were found to indeed carry a leader sequence, but simply circumvent the Golgi apparatus, which in canonical secretion is generally responsible for the modification and sorting of secretory proteins after their passage through the endoplasmic reticulum (ER). These alternative mechanisms of protein translocation to, or across, the plasma membrane were collectively termed “unconventional protein secretion” (UPS). To date, many research groups have studied UPS in their respective model organism of choice, with surprising reports on the proportion of unconventionally secreted proteins and their crucial roles for the cell and survival of the organism. Involved in processes such as immune responses and cell proliferation, and including far more different cargo proteins in different organisms than anyone had expected, unconventional secretion does not seem so unconventional after all. Alongside mammalian cells, much work on this topic has been done on protist parasites, including genera Leishmania, Trypanosoma, Plasmodium, Trichomonas, Giardia, and Entamoeba. Studies on protein secretion have mainly focused on parasite-derived virulence factors as a main source of pathogenicity for hosts. Given their need to secrete a variety of substrates, which may not be compatible with canonical secretion pathways, the study of mechanisms for alternative secretion pathways is particularly interesting in protist parasites. In this review, we provide an overview on the current status of knowledge on UPS in parasitic protists preceded by a brief overview of UPS in the mammalian cell model with a focus on IL-1β and FGF-2 as paradigmatic UPS substrates.
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Affiliation(s)
- Erina A Balmer
- Institute of Cell Biology, University of Bern, Bern, Switzerland
| | - Carmen Faso
- Institute of Cell Biology, University of Bern, Bern, Switzerland
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Baishya J, Bisht K, Rimbey JN, Yihunie KD, Islam S, Al Mahmud H, Waller JE, Wakeman CA. The Impact of Intraspecies and Interspecies Bacterial Interactions on Disease Outcome. Pathogens 2021; 10:96. [PMID: 33494265 PMCID: PMC7909810 DOI: 10.3390/pathogens10020096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/10/2021] [Accepted: 01/18/2021] [Indexed: 11/16/2022] Open
Abstract
The human microbiota is an array of microorganisms known to interact with the host and other microbes. These interactions can be competitive, as microbes must adapt to host- and microorganism-related stressors, thus producing toxic molecules, or cooperative, whereby microbes survive by maintaining homeostasis with the host and host-associated microbial communities. As a result, these microbial interactions shape host health and can potentially result in disease. In this review, we discuss these varying interactions across microbial species, their positive and negative effects, the therapeutic potential of these interactions, and their implications on our knowledge of human well-being.
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Affiliation(s)
| | | | | | | | | | | | | | - Catherine A. Wakeman
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA; (J.B.); (K.B.); (J.N.R.); (K.D.Y.); (S.I.); (H.A.M.); (J.E.W.)
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Abstract
Staphylococcus aureus is a ubiquitous, versatile and dangerous pathogen. It colonizes over 30% of the human population, and is one of the leading causes of death by an infectious agent. During S. aureus colonization and invasion, leukocytes are recruited to the site of infection. To combat S. aureus, leukocytes generate an arsenal of reactive species including superoxide, hydrogen peroxide, nitric oxide and hypohalous acids that modify and inactivate cellular macromolecules, resulting in growth defects or death. When S. aureus colonization cannot be cleared by the immune system, antibiotic treatment is necessary and can be effective. Yet, this organism quickly gains resistance to each new antibiotic it encounters. Therefore, it is in the interest of human health to acquire a deeper understanding of how S. aureus evades killing by the immune system. Advances in this field will have implications for the design of future S. aureus treatments that complement and assist the host immune response. In that regard, this review focuses on how S. aureus avoids host-generated oxidative stress, and discusses the mechanisms used by S. aureus to survive oxidative damage including antioxidants, direct repair of damaged proteins, sensing oxidant stress and transcriptional changes. This review will elucidate areas for studies to identify and validate future antimicrobial targets.
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Affiliation(s)
- William N Beavers
- Department of Pathology, Microbiology and Immunology, U.S. Department of Veteran Affairs, Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, 1161 21st Avenue South, Medical Center North, Nashville, TN 37232, USA
| | - Eric P Skaar
- Department of Pathology, Microbiology and Immunology, U.S. Department of Veteran Affairs, Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, 1161 21st Avenue South, Medical Center North, Nashville, TN 37232, USA Tennessee Valley Healthcare System, U.S. Department of Veteran Affairs, Vanderbilt Institute of Chemical Biology, Vanderbilt University School of Medicine, 1161 21st Avenue South, Nashville, TN 37232, USA
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