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Miallot R, Millet V, Roger A, Fenouil R, Tardivel C, Martin JC, Tranchida F, Shintu L, Berchard P, Sousa Lanza J, Malissen B, Henri S, Ugolini S, Dutour A, Finetti P, Bertucci F, Blay JY, Galland F, Naquet P. The coenzyme A precursor pantethine enhances antitumor immunity in sarcoma. Life Sci Alliance 2023; 6:e202302200. [PMID: 37833072 PMCID: PMC10583838 DOI: 10.26508/lsa.202302200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
The tumor microenvironment is a dynamic network of stromal, cancer, and immune cells that interact and compete for resources. We have previously identified the Vanin1 pathway as a tumor suppressor of sarcoma development via vitamin B5 and coenzyme A regeneration. Using an aggressive sarcoma cell line that lacks Vnn1 expression, we showed that the administration of pantethine, a vitamin B5 precursor, attenuates tumor growth in immunocompetent but not nude mice. Pantethine boosts antitumor immunity, including the polarization of myeloid and dendritic cells towards enhanced IFNγ-driven antigen presentation pathways and improved the development of hypermetabolic effector CD8+ T cells endowed with potential antitumor activity. At later stages of treatment, the effect of pantethine was limited by the development of immune cell exhaustion. Nevertheless, its activity was comparable with that of anti-PD1 treatment in sensitive tumors. In humans, VNN1 expression correlates with improved survival and immune cell infiltration in soft-tissue sarcomas, but not in osteosarcomas. Pantethine could be a potential therapeutic immunoadjuvant for the development of antitumor immunity.
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Affiliation(s)
- Richard Miallot
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Virginie Millet
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Anais Roger
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Romain Fenouil
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | | | | | | | - Laetitia Shintu
- CNRS, Centrale Marseille, ISM2, Aix Marseille Université, Marseille, France
| | - Paul Berchard
- INSERM 1052, CNRS 5286, Cancer Research Center of Lyon (CRCL), Childhood Cancers and Cell Death Laboratory, Lyon, France
| | - Juliane Sousa Lanza
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Bernard Malissen
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
- INSERM, CNRS, Centre D'Immunophénomique (CIPHE), Aix Marseille Université, Marseille, France
| | - Sandrine Henri
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Sophie Ugolini
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Aurélie Dutour
- INSERM 1052, CNRS 5286, Cancer Research Center of Lyon (CRCL), Childhood Cancers and Cell Death Laboratory, Lyon, France
| | - Pascal Finetti
- INSERM, CNRS, Centre de Recherche en Cancérologie de Marseille (CRCM), Institut Paoli-Calmettes (IPC), Laboratory of Predictive Oncology, Aix-Marseille Université, Marseille, France
| | - François Bertucci
- INSERM, CNRS, Centre de Recherche en Cancérologie de Marseille (CRCM), Institut Paoli-Calmettes (IPC), Laboratory of Predictive Oncology, Aix-Marseille Université, Marseille, France
- Institut Paoli-Calmettes, Department of Medical Oncology, Marseille, France
| | - Jean-Yves Blay
- INSERM 1052, CNRS 5286, Cancer Research Center of Lyon (CRCL), Childhood Cancers and Cell Death Laboratory, Lyon, France
- UNICANCER Centre Léon Bérard, Department of Medicine, Université Lyon I, Lyon, France
| | - Franck Galland
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
| | - Philippe Naquet
- https://ror.org/03vyjkj45 INSERM, CNRS, Centre D'Immunologie de Marseille-Luminy, Aix-Marseille Université, Marseille, France
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Santoro F, Pastore G, Fox V, Petit MA, Iannelli F, Pozzi G. Streptococcus pyogenes Φ1207.3 Is a Temperate Bacteriophage Carrying the Macrolide Resistance Gene Pair mef(A)- msr(D) and Capable of Lysogenizing Different Streptococci. Microbiol Spectr 2023; 11:e0421122. [PMID: 36625667 PMCID: PMC9927172 DOI: 10.1128/spectrum.04211-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 12/20/2022] [Indexed: 01/11/2023] Open
Abstract
Streptococcus pyogenes prophage Φ1207.3 (formerly Tn1207.3) carries the mef(A)-msr(D) resistance genes, responsible for type M macrolide resistance. To investigate if Φ1207.3 is a functional bacteriophage, we transferred the element from the original S. pyogenes host in a prophage-free and competence-deficient S. pneumoniae strain. Pneumococcal cultures of the Φ1207.3-carrying lysogen were treated with mitomycin C to assess if Φ1207.3 enters the lytic cycle. Mitomycin C induced a limited phage burst and a growth impairment, resulting in early entrance into the stationary phase. To determine if Φ1207.3 is able to produce mature phage particles, we prepared concentrated supernatants recovered from a mitomycin C-induced pneumococcal culture by sequential centrifugation and ultracentrifugation steps. Negative-staining transmission electron microscopy (TEM) of supernatants revealed the presence of phage particles with an icosahedral, electron-dense capsid and a long, noncontractile tail, typical of a siphovirus. Quantification of Φ1207.3 was performed by quantitative PCR (qPCR) and semiquantitatively by TEM. PCR quantified 3.34 × 104 and 6.06 × 104 excised forms of phage genome per milliliter of supernatant obtained from the untreated and mitomycin C-treated cultures, respectively. By TEM, we estimated 3.02 × 103 and 7.68 × 103 phage particles per milliliter of supernatant. The phage preparations of Φ1207.3 infected and lysogenized pneumococcal recipient strains at a frequency of 7.5 × 10-6 lysogens/recipient but did not show sufficient lytic activity to form plaques. Phage lysogenization efficiently occurred after 30 min of contact of the phages with the recipient cells and required a minimum of 103 phage particles. IMPORTANCE Bacteriophages play an important role in bacterial physiology and genome evolution. The widespread use of genome sequencing revealed that bacterial genomes can contain several different integrated temperate bacteriophages, which can constitute up to 20% of the genome. Most of these bacteriophages are only predicted in silico and are never shown to be functional. In fact, it is often difficult to induce the lytic cycle of temperate bacteriophages. In this work, we show that Φ1207.3, a peculiar bacteriophage originally from Streptococcus pyogenes, which can lysogenize different streptococci and carries the macrolide resistance mef(A)-msr(D) gene pair, is capable of producing mature virions, but only at a low level, while not being able to produce plaques. This temperate phage is probably a partially functional phage, which seems to have lost lytic characteristics to specialize in lysogenization. While we are not used to conceiving phages separately from lysis, this behavior could actually be more frequent than expected.
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Affiliation(s)
- Francesco Santoro
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Gabiria Pastore
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Valeria Fox
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Marie-Agnes Petit
- Université Paris-Saclay, INRAE, AgroParisTech, Micalis, Jouy-en-Josas, France
| | - Francesco Iannelli
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Gianni Pozzi
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
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