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Venero ECS, Giambartolomei L, Sosa E, Fernández do Porto D, López NI, Tribelli PM. Nitrosative stress under microaerobic conditions triggers inositol metabolism in Pseudomonas extremaustralis. PLoS One 2024; 19:e0301252. [PMID: 38696454 PMCID: PMC11065229 DOI: 10.1371/journal.pone.0301252] [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: 12/23/2023] [Accepted: 03/13/2024] [Indexed: 05/04/2024] Open
Abstract
Bacteria are exposed to reactive oxygen and nitrogen species that provoke oxidative and nitrosative stress which can lead to macromolecule damage. Coping with stress conditions involves the adjustment of cellular responses, which helps to address metabolic challenges. In this study, we performed a global transcriptomic analysis of the response of Pseudomonas extremaustralis to nitrosative stress, induced by S-nitrosoglutathione (GSNO), a nitric oxide donor, under microaerobic conditions. The analysis revealed the upregulation of genes associated with inositol catabolism; a compound widely distributed in nature whose metabolism in bacteria has aroused interest. The RNAseq data also showed heightened expression of genes involved in essential cellular processes like transcription, translation, amino acid transport and biosynthesis, as well as in stress resistance including iron-dependent superoxide dismutase, alkyl hydroperoxide reductase, thioredoxin, and glutathione S-transferase in response to GSNO. Furthermore, GSNO exposure differentially affected the expression of genes encoding nitrosylation target proteins, encompassing metalloproteins and proteins with free cysteine and /or tyrosine residues. Notably, genes associated with iron metabolism, such as pyoverdine synthesis and iron transporter genes, showed activation in the presence of GSNO, likely as response to enhanced protein turnover. Physiological assays demonstrated that P. extremaustralis can utilize inositol proficiently under both aerobic and microaerobic conditions, achieving growth comparable to glucose-supplemented cultures. Moreover, supplementing the culture medium with inositol enhances the stress tolerance of P. extremaustralis against combined oxidative-nitrosative stress. Concordant with the heightened expression of pyoverdine genes under nitrosative stress, elevated pyoverdine production was observed when myo-inositol was added to the culture medium. These findings highlight the influence of nitrosative stress on proteins susceptible to nitrosylation and iron metabolism. Furthermore, the activation of myo-inositol catabolism emerges as a protective mechanism against nitrosative stress, shedding light on this pathway in bacterial systems, and holding significance in the adaptation to unfavorable conditions.
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Affiliation(s)
| | - Lucia Giambartolomei
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ezequiel Sosa
- Instituto de Cálculo, Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
| | - Darío Fernández do Porto
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Cálculo, Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
| | - Nancy I. López
- IQUIBICEN-CONICET, Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Paula M. Tribelli
- IQUIBICEN-CONICET, Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
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Dmytrenko G, Fernández-Solari J, Correa F, De Laurentiis A. Oxytocin alleviates periodontitis in adult rats. J Periodontal Res 2024; 59:280-288. [PMID: 38226427 DOI: 10.1111/jre.13212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 11/03/2023] [Accepted: 11/07/2023] [Indexed: 01/17/2024]
Abstract
OBJECTIVE The objective of the study was to evaluate the expression of oxytocin receptors in normal and inflamed gingiva, as well as the effects of systemic administration of oxytocin in bone loss and gum inflammatory mediators in a rat model of experimental periodontitis. BACKGROUND DATA Current evidence supports the hypothesis of a disbalance between the oral microbiota and the host's immune response in the pathogenesis of periodontitis. Increased complexity of the microbial biofilm present in the periodontal pocket leads to local production of nitrogen and oxygen-reactive species, cytokines, chemokines, and other proinflammatory mediators which contribute to periodontal tissue destruction and bone loss. Oxytocin has been suggested to participate in the modulation of immune and inflammatory processes. We have previously shown that oxytocin, nitric oxide, and endocannabinoid system interact providing a mechanism of regulation for systemic inflammation. Here, we aimed at investigating not only the presence and levels of expression of oxytocin receptors on healthy and inflamed gingiva, but also the effects of oxytocin treatment on alveolar bone loss, and systemic and gum expression of inflammatory mediators involved in periodontal tissue damage using ligature-induced periodontitis. Therefore, anti-inflammatory strategies oriented at modulating the host's immune response could be valuable adjuvants to the main treatment of periodontal disease. METHODS We used an animal model of ligature-induced periodontitis involving the placement of a linen thread (Barbour flax 100% linen suture, No. 50; size 2/0) ligature around the neck of first lower molars of adult male rats. The ligature was left in place during the entire experiment (7 days) until euthanasia. Animals with periodontitis received daily treatment with oxytocin (OXT, 1000 μg/kg, sc.) or vehicle and/or atosiban (3 mg/kg, sc.), an antagonist of oxytocin receptors. The distance between the cement-enamel junction and the alveolar bone crest was measured in stained hemimandibles in the long axis of both buccal and lingual surfaces of both inferior first molars using a caliper. TNF-α levels in plasma were determined using specific rat enzyme-linked immunosorbent assays (ELISA). OXT receptors, IL-6, IL-1β, and TNF-α expression were determined in gingival tissues by semiquantitative or real-time PCR. RESULTS We show that oxytocin receptors are expressed in normal and inflamed gingival tissues in male rats. We also show that the systemic administration of oxytocin prevents the experimental periodontitis-induced increased gum expression of oxytocin receptors, TNF-α, IL-6, and IL-1β (p < .05). Furthermore, we observed a reduction in bone loss in rats treated with oxytocin in our model. CONCLUSIONS Our results demonstrate that oxytocin is a novel and potent modulator of the gingival inflammatory process together with bone loss preventing effects in an experimental model of ligature-induced periodontitis.
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Affiliation(s)
- Ganna Dmytrenko
- Facultad de Odontología, Cátedra de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Javier Fernández-Solari
- Facultad de Odontología, Cátedra de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Fernando Correa
- Facultad de Medicina, Centro de Estudios Farmacológicos y Botánicos, CEFYBO-UBA-CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Odontología, Cátedra de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Andrea De Laurentiis
- Facultad de Medicina, Centro de Estudios Farmacológicos y Botánicos, CEFYBO-UBA-CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Odontología, Cátedra de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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Salvati B, Flórez-Castillo JM, Santagapita PR, Barja BC, Perullini M. One-pot synthesis of alginate-antimicrobial peptide nanogel. Photochem Photobiol Sci 2024; 23:665-679. [PMID: 38443738 DOI: 10.1007/s43630-024-00542-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 01/23/2024] [Indexed: 03/07/2024]
Abstract
Nanosized alginate-based particles (NAPs) were obtained in a one-pot solvent-free synthesis procedure, achieving the design of a biocompatible nanocarrier for the encapsulation of IbM6 antimicrobial peptide (IbM6). IbM6 is integrated in the nascent nanosized hydrogel self-assembly guided by electrostatic interactions and by weak interactions, typical of soft matter. The formation of the nanogel is a dynamic and complex process, which presents an interesting temporal evolution. In this work, we optimized the synthesis conditions of IbM6-NAPs based on small-angle X-ray scattering (SAXS) measurements and evaluated its time evolution over several weeks by sensing the IbM6 environment in IbM6-NAPs from photochemical experiments. Fluorescence deactivation experiments revealed that the accessibility of different quenchers to the IbM6 peptide embedded in NAPs is dependent on the aging time of the alginate network. Lifetimes measurements indicate that the deactivation paths of the excited state of the IbM6 in the nanoaggregates are reduced when compared with those exhibited by the peptide in aqueous solution, and are also dependent on the aging time of the nanosized alginate network. Finally, the entrapment of IbM6 in NAPs hinders the degradation of the peptide by trypsin, increasing its antimicrobial activity against Escherichia coli K-12 in simulated operation conditions.
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Affiliation(s)
- Brianne Salvati
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física (DQIAQF), Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Química de Materiales medio Ambiente y Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Johanna Marcela Flórez-Castillo
- Universidad de Magdalena, Santa Marta, Colombia
- Universidad de Santander UDES, Grupo de Investigación en Ciencias Básicas y Aplicadas para la Sostenibilidad-CIBAS, Santander, Colombia
| | - Patricio Román Santagapita
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Universidad de Buenos Aires, Buenos Aires, Argentina
- Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Beatriz C Barja
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física (DQIAQF), Universidad de Buenos Aires, Buenos Aires, Argentina.
- Instituto de Química de Materiales medio Ambiente y Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
| | - Mercedes Perullini
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física (DQIAQF), Universidad de Buenos Aires, Buenos Aires, Argentina.
- Instituto de Química de Materiales medio Ambiente y Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
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Gallelli MF, Zampini E, Trasorras V, Carretero MI, Bertuzzi M, Amusquibar V, Pereira M, Bianchi CP. Haematology and biochemistry in healthy llamas at sea level. Vet Res Commun 2024; 48:1253-1256. [PMID: 38105361 DOI: 10.1007/s11259-023-10285-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 12/14/2023] [Indexed: 12/19/2023]
Abstract
In the last years, there has been an increasing interest in llamas, not only as part of a productive system, but mostly as companion animals. Most reports regarding clinical biochemistry and haematology include few llamas and details about their health status are not available. The present study aims to provide haematological and biochemical parameters for llamas of known health status. Twenty-three non-pregnant females and seven males that live in Buenos Aires, Argentina (34°36'S, 58°22'W, at sea level) were studied. Llamas were clinically healthy, in good nutritional status. Animals were kept at grass and were fed hay bale or pellets and water ad libitum. Blood samples were collected by jugular venipuncture in spring. Packed cell volume, leucocyte count, differential white cell count, platelets count, urea, creatinine, total proteins, albumin, alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase, glucose, calcium and phosphate were assessed. No significant differences were observed between males and females, except for platelet count and calcium, which was greater in males (P˂0.01). Values obtained for the different parameters were similar to those previously reported, except for monocytes, alkaline phosphatase, glucose and calcium, that were lower and lymphocytes and platelets count, that were higher in this study. In conclusion, different ambient and methodological conditions might affect some parameters. The parameters hereby presented are representative of llama's population living at sea level in South America.
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Affiliation(s)
- M F Gallelli
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina.
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina.
| | - E Zampini
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - V Trasorras
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - M I Carretero
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - M Bertuzzi
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - V Amusquibar
- Instituto de Investigación y Tecnología en Reproducción Animal (INITRA), Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - M Pereira
- Laboratorio de Análisis Clínicos, Hospital Escuela, Facultad de Ciencias Veterinarias, UBA, Buenos Aires, Argentina
| | - C P Bianchi
- Laboratorio de Endocrinología, CIVETAN, Fac. de Cs. Veterinarias, UNCPBA, Ciudad de Tandil, Buenos Aires, Argentina
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Arrabal JP, Arce LF, Macchiaroli N, Kamenetzky L. Ecological and molecular associations between neotropical wild felids and Taenia (Cestoda: Taeniidae) in the Atlantic Forest: a new report for Taenia omissa. Parasitol Res 2023; 122:2999-3012. [PMID: 37874392 DOI: 10.1007/s00436-023-07989-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 09/25/2023] [Indexed: 10/25/2023]
Abstract
Ecological associations between wild felids and parasites from the Taeniidae family are related to predator-prey interactions, where felids act as definitive hosts while their prey, herbivores and/or omnivores, act as intermediate hosts. In the Atlantic Forest, six neotropical felid species coexist in sympatry, but the ecological parasite-host interactions remain poorly studied. Taenia omissa is a tapeworm that parasitizes cougars (Puma concolor) as its only definitive host and their ungulate prey as intermediate hosts. The aim of this study was to identify tapeworms present in road-killed fauna using both molecular and morphological characteristics and their predator-prey relationship. Adult tapeworms found in a cougar, a jaguarundi (Herpailurus yagouaroundi), and two ocelots (Leopardus pardalis); and metacestodes found in a red brocket deer (Mazama americana) and a wild guinea pig (Cavia aperea) were analyzed. Through morphological analysis of rostellar hooks and molecular analysis of the mitochondrial genetic marker cox1, Taenia omissa adult individuals were identified in the cougar, and metacestodes in the red brocket deer, proving the existence of a full host-parasite life cycle in the Atlantic Forest region. This new report reveals the southernmost record of T. omissa and broadens its geographic distribution. In addition, isolates of the Taenia genus divergent from those described so far in molecular databases were reported and suggested a wild cycle that involves the jaguarundi and agouti (Dasyprocta asarae) as definitive and intermediate hosts, respectively. These results highlight the complexity of the tapeworm population in the region and the need to study it with both morphological and molecular approaches.
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Affiliation(s)
- Juan Pablo Arrabal
- Instituto de Biología Subtropical (IBS), CONICET - Universidad Nacional de Misiones (UNaM), Garupá, Argentina
- Asociación Civil Centro de Investigaciones del Bosque Atlántico (CeIBA), Puerto Iguazú, Misiones, Argentina
| | - Lucas Federico Arce
- Laboratorio de Biofísica y Biología Celular de Proteínas Que Unen Lípidos, Instituto de Investigaciones Bioquímicas de La Plata "Profesor Doctor Rodolfo R. Brenner" (INIBIOLP), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Natalia Macchiaroli
- Laboratorio de Genómica y Bioinformática de Patógenos, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Departamento de Fisiología y Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Laura Kamenetzky
- Laboratorio de Genómica y Bioinformática de Patógenos, Instituto de Biociencias, Biotecnología y Biología Traslacional (iB3), Departamento de Fisiología y Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina.
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Incicco JJ, Cababie LA, Sarto C, Adler NS, Amrein F, Mikkelsen E, Arrar M, Kaufman SB. Thermodynamic and mechanistic analysis of the functional properties of dengue virus NS3 helicase. Biophys Rev 2023; 15:591-600. [PMID: 37681085 PMCID: PMC10480135 DOI: 10.1007/s12551-023-01101-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 07/17/2023] [Indexed: 09/09/2023] Open
Abstract
The Dengue Virus (DENV) non-structural protein 3 (NS3) is a multi-functional protein critical in the viral life cycle. The DENV NS3 is comprised of a serine protease domain and a helicase domain. The helicase domain itself acts as a molecular motor, either translocating in a unidirectional manner along single-stranded RNA or unwinding double-stranded RNA, processes fueled by the hydrolysis of nucleoside triphosphates. In this brief review, we summarize our contributions and ongoing efforts to uncover the thermodynamic and mechanistic functional properties of the DENV NS3 as an NTPase and helicase.
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Affiliation(s)
- J. Jeremías Incicco
- Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Universidad de Buenos Aires, CONICET, Junín 956, Caba, 1113 Argentina
- Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Caba, 1113 Argentina
| | - Leila A. Cababie
- Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Universidad de Buenos Aires, CONICET, Junín 956, Caba, 1113 Argentina
- Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Caba, 1113 Argentina
| | - Carolina Sarto
- Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN), Universidad de Buenos Aires. CONICET, Intendente Güiraldes 2160, Caba, 1428 Argentina
| | - Natalia S. Adler
- CONICET. Centro de Investigaciones en Bionanociencias (CIBION), Godoy Cruz 2390, Caba, 1425 Argentina
| | - Fernando Amrein
- Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Universidad de Buenos Aires, CONICET, Junín 956, Caba, 1113 Argentina
- Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Caba, 1113 Argentina
| | - Evelyn Mikkelsen
- Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Universidad de Buenos Aires, CONICET, Junín 956, Caba, 1113 Argentina
- Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Caba, 1113 Argentina
| | - Mehrnoosh Arrar
- Instituto de Cálculo, Universidad de Buenos Aires. CONICET, Intendente Güiraldes 2160, Caba, 1428 Argentina
| | - Sergio B. Kaufman
- Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Universidad de Buenos Aires, CONICET, Junín 956, Caba, 1113 Argentina
- Departamento de Química Biológica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Caba, 1113 Argentina
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Bonino MP, Crivelli XB, Petrina JF, Galateo S, Gomes TAT, Navarro A, Cundon C, Broglio A, Sanin M, Bentancor A. Detection and analysis of Shiga toxin producing and enteropathogenic Escherichia coli in cattle from Tierra del Fuego, Argentina. Braz J Microbiol 2023; 54:1257-1266. [PMID: 37041346 PMCID: PMC10235289 DOI: 10.1007/s42770-023-00958-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 03/22/2023] [Indexed: 04/13/2023] Open
Abstract
Shiga toxin producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) are pathovars that affect mainly infants' health. Cattle are the main reservoir of STEC. Uremic hemolytic syndrome and diarrheas can be found at high rates in Tierra del Fuego (TDF). This study aimed to establish the prevalence of STEC and EPEC in cattle at slaughterhouses in TDF and to analyze the isolated strains. Out of 194 samples from two slaughterhouses, STEC prevalence was 15%, and EPEC prevalence was 5%. Twenty-seven STEC strains and one EPEC were isolated. The most prevalent STEC serotypes were O185:H19 (7), O185:H7 (6), and O178:H19 (5). There were no STEC eae + strains (AE-STEC) or serogroup O157 detected in this study. The prevalent genotype was stx2c (10/27) followed by stx1a/stx2hb (4/27). Fourteen percent of the strains presented at least one stx non-typeable subtype (4/27). Shiga toxin production was detected in 25/27 STEC strains. The prevalent module for the Locus of Adhesion and Autoaggregation (LAA) island was module III (7/27). EPEC strain was categorized as atypical and with the ability to cause A/E lesion. The ehxA gene was present in 16/28 strains, 12 of which were capable of producing hemolysis. No hybrid strains were detected in this work. Antimicrobial susceptibility tests showed that all strains were resistant to ampicillin and 20/28 were resistant to aminoglycosides. No statistical differences could be seen in the detection of STEC or EPEC either by slaughterhouse location or by production system (extensive grass or feedlot). The rate of STEC detection was lower than the one reported for the rest of Argentina. STEC/EPEC relation was 3 to 1. This is the first study on cattle from TDF as reservoir for strains that are potentially pathogenic to humans.
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Affiliation(s)
- Maria Paz Bonino
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina.
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina.
| | - Ximena Blanco Crivelli
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina
| | - Juan Facundo Petrina
- Departamento de Epidemiología, Ministerio de Salud de Tierra del Fuego, Ushuaia, Argentina
| | - Sebastian Galateo
- Dirección de Fiscalización Sanitaria, Ministerio de Salud de Tierra del Fuego, Ushuaia, Argentina
| | | | - Armando Navarro
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de Mexico, Mexico City, Mexico
| | - Cecilia Cundon
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina
| | - Alicia Broglio
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
| | - Mariana Sanin
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina
| | - Adriana Bentancor
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Instituto de Investigaciones en Epidemiología Veterinaria, Cátedra de Microbiología, Buenos Aires, Argentina
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Vignale FA, Bernal Rey D, Pardo AM, Almasqué FJ, Ibarra JG, Fernández Do Porto D, Turjanski AG, López NI, Helman RJM, Raiger Iustman LJ. Spatial and Seasonal Variations in the Bacterial Community of an Anthropogenic Impacted Urban Stream. Microb Ecol 2023; 85:862-874. [PMID: 35701635 DOI: 10.1007/s00248-022-02055-z] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 06/02/2022] [Indexed: 05/04/2023]
Abstract
Environmental changes and human activities can alter the structure and diversity of aquatic microbial communities. In this work, we analyzed the bacterial community dynamics of an urban stream to understand how these factors affect the composition of river microbial communities. Samples were taken from a stream situated in Buenos Aires, Argentina, which flows through residential, peri-urban horticultural, and industrial areas. For sampling, two stations were selected: one influenced by a series of industrial waste treatment plants and horticultural farms (PL), and the other influenced by residential areas (R). Microbial communities were analyzed by sequence analysis of 16S rRNA gene amplicons along an annual cycle. PL samples showed high nutrient content compared with R samples. The diversity and richness of the R site were more affected by seasonality than those of the PL site. At the amplicon sequence variants level, beta diversity analysis showed a differentiation between cool-season (fall and winter) and warm-season (spring and summer) samples, as well as between PL and R sites. This demonstrated that there is spatial and temporal heterogeneity in the composition of the bacterial community, which should be considered if a bioremediation strategy is applied. The taxonomic composition analysis also revealed a differential seasonal cycle of phototrophs and chemoheterotrophs between the sampling sites, as well as different taxa associated with each sampling site. This analysis, combined with a comparative analysis of global rivers, allowed us to determine the genera Arcobacter, Simplicispira, Vogesella, and Sphingomonas as potential bioindicators of anthropogenic disturbance.
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Affiliation(s)
- Federico A Vignale
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Daissy Bernal Rey
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
- Instituto de Química Física de los Materiales, Medio Ambiente Y Energía (INQUIMAE)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Agustín M Pardo
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
- Facultad de Ciencias Exactas Y Naturales, Instituto de Cálculo, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Facundo J Almasqué
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - José G Ibarra
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Darío Fernández Do Porto
- Facultad de Ciencias Exactas Y Naturales, Instituto de Cálculo, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Adrián G Turjanski
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Nancy I López
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
- Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Renata J Menéndez Helman
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Laura J Raiger Iustman
- Instituto de Química Biológica de La Facultad de Ciencias Exactas Y Naturales (IQUIBICEN)-CONICET, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina.
- Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina.
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Arcuri A, Zhang M, Belhadi A, Marculescu B, Golmohammadi A, Galeotti JP, Seran S. Building an open-source system test generation tool: lessons learned and empirical analyses with EvoMaster. Softw Qual J 2023; 31:947-990. [PMID: 37692292 PMCID: PMC10483991 DOI: 10.1007/s11219-023-09620-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/07/2023] [Indexed: 09/12/2023]
Abstract
Research in software testing often involves the development of software prototypes. Like any piece of software, there are challenges in the development, use and verification of such tools. However, some challenges are rather specific to this problem domain. For example, often these tools are developed by PhD students straight out of bachelor/master degrees, possibly lacking any industrial experience in software development. Prototype tools are used to carry out empirical studies, possibly studying different parameters of novel designed algorithms. Software scaffolding is needed to run large sets of experiments efficiently. Furthermore, when using AI-based techniques like evolutionary algorithms, care needs to be taken to deal with their randomness, which further complicates their verification. The aforementioned represent some of the challenges we have identified for this domain. In this paper, we report on our experience in building the open-source EvoMaster tool, which aims at system-level test case generation for enterprise applications. Many of the challenges we faced would be common to any researcher needing to build software testing tool prototypes. Therefore, one goal is that our shared experience here will boost the research community, by providing concrete solutions to many development challenges in the building of such kind of research prototypes. Ultimately, this will lead to increase the impact of scientific research on industrial practice.
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Affiliation(s)
- Andrea Arcuri
- Kristiania University College, Oslo, Norway
- Oslo Metropolitan University, Oslo, Norway
| | - Man Zhang
- Kristiania University College, Oslo, Norway
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Pérez-Chada D, Bioch SA, Schönfeld D, Gozal D, Perez-Lloret S. Screen use, sleep duration, daytime somnolence, and academic failure in school-aged adolescents. PLoS One 2023; 18:e0281379. [PMID: 36787301 PMCID: PMC9928097 DOI: 10.1371/journal.pone.0281379] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 01/22/2023] [Indexed: 02/15/2023] Open
Abstract
In this study, we examined the relationship between screen time use, sleep characteristics, daytime somnolence, and academic performance in school-aged adolescents. We surveyed 1,257 12- to 18-year-old adolescents attending 52 schools in urban or suburban areas of Argentina. We recorded the daily exposure to various screen-based activities, including video- and online-gaming, social media, TV or streaming. Screen time and device type in the hour before bedtime, sleep patterns during weekdays and weekends, somnolence (Pediatric Daytime Sleepiness Scale score), and grades in language and mathematics were also assessed. Structural Equation Modelling was used to identify a path connecting the latent variables. Results are expressed as standardized regression weights (srw). Missing data were present in 393 subjects, and thus the final sample consisted of 864 complete responses. Daytime somnolence (i.e., PDSS score ≥ 15) was observed in 614 participants (71%), and academic failure (i.e., grades < 7/10) in 352 of them (41%). Time spent using video gaming consoles was negatively associated with sleep duration (srw = -0.22, p<0.01) and positively connected with daytime somnolence (srw = 0.11, p<0.01). Use of mobile devices was associated with lower academic performance (srw = -0.11, p<0.01). Sleep duration was inversely related to daytime somnolence (srw = -0.27, p<0.01), which was in turn negatively associated with academic performance (srw = -0.18, p<0.05). Bedtime computer use did not influence any outcome. In summary, among adolescents, screen use adversely affected nighttime sleep, daytime somnolence, and academic performance. These findings call for the implementation of educational public campaigns aimed at promoting healthy sleep and reducing screen exposure among adolescents.
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Affiliation(s)
- Daniel Pérez-Chada
- Pulmonary Medicine, Universidad Austral, Hospital Universitario Austral, Pilar, Argentina
| | - Sergio Arias Bioch
- Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni”, Administración Nacional de Laboratorios e Institutos de Salud “Dr. Carlos G. Malbrán”, Santa Fe, Argentina
| | | | - David Gozal
- Department of Child Health and Child Health Research Institute, University of Missouri School of Medicine, Columbia, Missouri, United States of America
| | - Santiago Perez-Lloret
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
- Observatorio de Salud Pública, Pontificia Universidad Católica Argentina, Buenos Aires, Argentina
- Faculty of Medicine, Department of Physiology, University of Buenos Aires, Buenos Aires, Argentina
- * E-mail:
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Pérez MB, Argañaraz Martinez E, Babot JD, Pérez Chaia A, Saguir FM. Growth studies of dominant lactic acid bacteria in orange juice and selection of strains to ferment citric fruit juices with probiotic potential. Braz J Microbiol 2022; 53:2145-2156. [PMID: 36151453 PMCID: PMC9679108 DOI: 10.1007/s42770-022-00830-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 09/13/2022] [Indexed: 01/13/2023] Open
Abstract
The study aimed to evaluate the ability of dominant lactic acid bacteria (LAB) in orange juice to growth on N-depleted MRS medium supplemented or not with cysteine (mMRS), then to select the most nutritionally promising strains for growth assays in the food matrix and evaluation of beneficial attributes for fruit juice fermentation. Levilactobacillus brevis and Lactiplantibacillus plantarum were dominant species among the total of 103 LAB isolates as confirmed by multiplex PCR and/or 16 s rDNA sequence analysis. Based on growing lower than 20% and higher than 70% in mMRS (1.0 g/l meat extract, without peptone and yeast extract) with and without cysteine requirement, one L. brevis (JNB23) and two L. plantarum (JNB21 and JNB25) were selected. These bacteria and the L. plantarum strains N4 and N8 (previously isolated from oranges peel) when inoculated in orange juice grew up to 1.0 log cfu/ml for 24 h incubation at 30 °C and mainly produced lactic acid, with strains JNB25 and JNB23 reaching the highest and lowest cell densities in agreement with their nutritional exigency. In addition, all L. plantarum strains exhibited antagonistic activity against the majority of tested bacterial pathogens (in opposition to L. brevis), ability to grow or survive to pH 3.0 for 3 h, to grow with 0.5% sodium taurocholate, and a decrease after simulated gastrointestinal digestion assay which did not exceed 1.0 or 2.0 log units, depending on the strain. Thus, autochthonous L. plantarum strains with ability for overcoming nutritional limitations and beneficial attributes are promising candidates for further investigations as novel probiotic and/or preservative starters to ferment citric fruit juices.
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Affiliation(s)
- María B Pérez
- Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia (FBQF), Universidad Nacional de Tucumán (UNT), Ayacucho 471, (T4000ILC), San Miguel de Tucumán, Argentina
| | - Eloy Argañaraz Martinez
- Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia (FBQF), Universidad Nacional de Tucumán (UNT), Ayacucho 471, (T4000ILC), San Miguel de Tucumán, Argentina
| | - Jaime D Babot
- Centro de Referencia Para Lactobacilos (CERELA)-CCT NOA Sur-CONICET, Chacabuco 145, T4000ILC, San Miguel de Tucumán, Argentina
| | - Adriana Pérez Chaia
- Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia (FBQF), Universidad Nacional de Tucumán (UNT), Ayacucho 471, (T4000ILC), San Miguel de Tucumán, Argentina
- Centro de Referencia Para Lactobacilos (CERELA)-CCT NOA Sur-CONICET, Chacabuco 145, T4000ILC, San Miguel de Tucumán, Argentina
| | - Fabiana M Saguir
- Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia (FBQF), Universidad Nacional de Tucumán (UNT), Ayacucho 471, (T4000ILC), San Miguel de Tucumán, Argentina.
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Vaca HR, Celentano AM, Toscanini MA, Heimburg T, Ghazy E, Zeyen P, Hauser AT, Oliveira G, Elissondo MC, Jung M, Sippl W, Camicia F, Rosenzvit MC. The potential for histone deacetylase (HDAC) inhibitors as cestocidal drugs. PLoS Negl Trop Dis 2021; 15:e0009226. [PMID: 33657105 PMCID: PMC7959350 DOI: 10.1371/journal.pntd.0009226] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 03/15/2021] [Accepted: 02/10/2021] [Indexed: 11/18/2022] Open
Abstract
Background Echinococcosis and cysticercosis are neglected tropical diseases caused by cestode parasites (family Taeniidae). Not only there is a small number of approved anthelmintics for the treatment of these cestodiases, but also some of them are not highly effective against larval stages, such that identifying novel drug targets and their associated compounds is critical. Histone deacetylase (HDAC) enzymes are validated drug targets in cancers and other diseases, and have been gaining relevance for developing new potential anti-parasitic treatments in the last years. Here, we present the anthelmintic profile for a panel of recently developed HDAC inhibitors against the model cestode Mesocestoides vogae (syn. M. corti). Methodology/Principal findings Phenotypic screening was performed on M. vogae by motility measurements and optical microscopic observations. Some HDAC inhibitors showed potent anthelmintic activities; three of them -entinostat, TH65, and TH92- had pronounced anthelmintic effects, reducing parasite viability by ~100% at concentrations of ≤ 20 μM. These compounds were selected for further characterization and showed anthelmintic effects in the micromolar range and in a time- and dose-dependent manner. Moreover, these compounds induced major alterations on the morphology and ultrastructural features of M. vogae. The potencies of these compounds were higher than albendazole and the anthelmintic effects were irreversible. Additionally, we evaluated pairwise drug combinations of these HDAC inhibitors and albendazole. The results suggested a positive interaction in the anthelmintic effect for individual pairs of compounds. Due to the maximum dose approved for entinostat, adjustments in the dose regime and/or combinations with currently-used anthelmintic drugs are needed, and the selectivity of TH65 and TH92 towards parasite targets should be assessed. Conclusion, significance The results presented here suggest that HDAC inhibitors represent novel and potent drug candidates against cestodes and pave the way to understanding the roles of HDACs in these parasites. Neglected tropical diseases, such as echinococcosis and cysticercosis, which are caused by taeniid cestodes (tapeworms), represent serious public health problems in many countries around the world. Given that there is only a small number of approved anthelmintics for the treatment of cestodiases, and that most of them are not highly effective against larval stages, identifying novel drug targets and their associated compounds is critical. Histone deacetylases (HDACs) are enzymes that produce epigenetic modifications of chromatin, thus modifying cellular gene expression. In this study, we evaluate and characterize a number of HDAC inhibitors on the model cestode Mesocestoides vogae and report the anthelmintic profile of these compounds. Some of the HDAC inhibitors tested showed potent anthelmintic effects, particularly entinostat, TH65 and TH92. These compounds were selected as the most promising candidates due to their high potencies, which were superior to the commercially-available anthelmintic drug albendazole. We also evaluated pairwise drug combinations of HDAC inhibitors and albendazole. The findings of this study provide a starting point for the development of new HDAC-based cestocidal compounds.
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Affiliation(s)
- Hugo Rolando Vaca
- Instituto de Microbiología y Parasitología Médica, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET). Facultad de Medicina, Paraguay 2155, piso 13, C1121ABG, Buenos Aires, Argentina
- Laboratorio de Zoonosis Parasitarias, Instituto de Investigaciones en Producción, Sanidad y Ambiente (IIPROSAM), Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Ana María Celentano
- Instituto de Microbiología y Parasitología Médica, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET). Facultad de Medicina, Paraguay 2155, piso 13, C1121ABG, Buenos Aires, Argentina
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - María Agustina Toscanini
- Instituto de Microbiología y Parasitología Médica, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET). Facultad de Medicina, Paraguay 2155, piso 13, C1121ABG, Buenos Aires, Argentina
| | - Tino Heimburg
- Institute of Pharmacy, Martin-Luther-University of Halle-Wittenberg, Halle(Saale), Germany
| | - Ehab Ghazy
- Institute of Pharmacy, Martin-Luther-University of Halle-Wittenberg, Halle(Saale), Germany
| | - Patrik Zeyen
- Institute of Pharmacy, Martin-Luther-University of Halle-Wittenberg, Halle(Saale), Germany
| | | | | | - María Celina Elissondo
- Laboratorio de Zoonosis Parasitarias, Instituto de Investigaciones en Producción, Sanidad y Ambiente (IIPROSAM), Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Manfred Jung
- Institute of Pharmaceutical Sciences, University of Freiburg, Freiburg, Germany
| | - Wolfgang Sippl
- Institute of Pharmacy, Martin-Luther-University of Halle-Wittenberg, Halle(Saale), Germany
| | - Federico Camicia
- Instituto de Microbiología y Parasitología Médica, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET). Facultad de Medicina, Paraguay 2155, piso 13, C1121ABG, Buenos Aires, Argentina
- * E-mail: (FC); (MCR)
| | - Mara Cecilia Rosenzvit
- Instituto de Microbiología y Parasitología Médica, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Tecnológicas (IMPaM, UBA-CONICET). Facultad de Medicina, Paraguay 2155, piso 13, C1121ABG, Buenos Aires, Argentina
- * E-mail: (FC); (MCR)
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Abstract
Sleep plays an essential role in both neural and energetic homeostasis of animals. Honey bees (Apis mellifera) manifest the sleep state as a reduction in muscle tone and antennal movements, which is susceptible to physical or chemical disturbances. This social insect is one of the most important pollinators in agricultural ecosystems, being exposed to a great variety of agrochemicals, which might affect its sleep behaviour. The intake of glyphosate (GLY), the herbicide most widely used worldwide, impairs learning, gustatory responsiveness and navigation in honey bees. In general, these cognitive abilities are linked with the amount and quality of sleep. Furthermore, it has been reported that animals exposed to sleep disturbances show impairments in both metabolism and memory consolidation. Consequently, we assessed the sleep pattern of bees fed with a sugar solution containing GLY (0, 25, 50 and 100 ng) by quantifying their antennal activity during the scotophase. We found that the ingestion of 50 ng of GLY decreased both antennal activity and sleep bout frequency. This sleep deepening after GLY intake could be explained as a consequence of the regenerative function of sleep and the metabolic stress induced by the herbicide.
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Affiliation(s)
- Diego E Vázquez
- Laboratorio de Insectos Sociales, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - M Sol Balbuena
- Laboratorio de Insectos Sociales, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Fidel Chaves
- Laboratorio de Insectos Sociales, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Jacob Gora
- Institut für Biologie, Freie Universität Berlin, Berlin, Germany
| | - Randolf Menzel
- Institut für Biologie, Freie Universität Berlin, Berlin, Germany
| | - Walter M Farina
- Laboratorio de Insectos Sociales, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
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Saez TMM, Fernandez Bessone I, Rodriguez MS, Alloatti M, Otero MG, Cromberg LE, Pozo Devoto VM, Oubiña G, Sosa L, Buffone MG, Gelman DM, Falzone TL. Kinesin-1-mediated axonal transport of CB1 receptors is required for cannabinoid-dependent axonal growth and guidance. Development 2020; 147:dev184069. [PMID: 32265198 PMCID: PMC7188441 DOI: 10.1242/dev.184069] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 02/23/2020] [Indexed: 12/14/2022]
Abstract
Endocannabinoids (eCB) modulate growth cone dynamics and axonal pathfinding through the stimulation of cannabinoid type-1 receptors (CB1R), the function of which depends on their delivery and precise presentation at the growth cone surface. However, the mechanism involved in the axonal transport of CB1R and its transport role in eCB signaling remains elusive. As mutations in the kinesin-1 molecular motor have been identified in patients with abnormal cortical development and impaired white matter integrity, we studied the defects in axonal pathfinding and fasciculation in mice lacking the kinesin light chain 1 (Klc1-/-) subunit of kinesin-1. Reduced levels of CB1R were found in corticofugal projections and axonal growth cones in Klc1-/- mice. By live-cell imaging of CB1R-eGFP we characterized the axonal transport of CB1R vesicles and described the defects in transport that arise after KLC1 deletion. Cofilin activation, which is necessary for actin dynamics during growth cone remodeling, is impaired in the Klc1-/- cerebral cortex. In addition, Klc1-/- neurons showed expanded growth cones that were unresponsive to CB1R-induced axonal elongation. Together, our data reveal the relevance of kinesin-1 in CB1R axonal transport and in eCB signaling during brain wiring.
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Affiliation(s)
- Trinidad M M Saez
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - Iván Fernandez Bessone
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - María S Rodriguez
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - Matías Alloatti
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - María G Otero
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - Lucas E Cromberg
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - Victorio M Pozo Devoto
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
| | - Gonzalo Oubiña
- Instituto de Biología y Medicina Experimental, IBYME (CONICET), CP 1428 Buenos Aires, Argentina
| | - Lucas Sosa
- Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, CP 5000 Córdoba, Argentina
| | - Mariano G Buffone
- Instituto de Biología y Medicina Experimental, IBYME (CONICET), CP 1428 Buenos Aires, Argentina
| | - Diego M Gelman
- Instituto de Biología y Medicina Experimental, IBYME (CONICET), CP 1428 Buenos Aires, Argentina
| | - Tomás L Falzone
- Instituto de Biología Celular y Neurociencia, IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, CP 1121 Buenos Aires, Argentina
- Instituto de Biología y Medicina Experimental, IBYME (CONICET), CP 1428 Buenos Aires, Argentina
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15
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Aguirre Calvo TR, Santagapita PR. Freezing and drying of pink grapefruit-lycopene encapsulated in Ca(II)-alginate beads containing galactomannans. J Food Sci Technol 2019; 56:3264-3271. [PMID: 31274893 PMCID: PMC6582125 DOI: 10.1007/s13197-019-03783-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 04/10/2019] [Accepted: 04/12/2019] [Indexed: 02/03/2023]
Abstract
Lycopene extracted from pink grapefruit was encapsulated on Ca(II)-alginate beads with the addition of trehalose and galactomannans to improve its stability against freezing and drying. Three galactomannans of different physicochemical properties were studied since their inclusion affects both loading efficiency and release of lycopene in wet beads; however, there is no information about their performance during freezing and dehydration operations. The remaining lycopene and its stability towards isomerization were analyzed in beads subjected to continuous freezing, freezing/thawing cycles and vacuum- and freeze-drying. Isothermal crystallization studies were conducted by LF-NMR and related to beads formulation and lycopene stability. In the absence of excipients, lycopene was severely affected by all the treatments, retaining less than 20% of the original content. Alginate beads containing trehalose with guar gum protected more than 80% of the lycopene regardless of the employed freezing or drying methods. These beads concomitantly showed higher solid fraction than the other two galactomannans-containing systems, displaying guar gum ability to associate water. On the other hand, the addition of vinal gum affected lycopene stability (between 40 and 60% were recovered after treatments), even compromising the positive effect of a well-established cryoprotectant as trehalose. Thus, the addition of secondary excipients should be carefully conducted. The differences among galactomannans could be related to the substitution degree of the polymer chains, affecting the overall systems interactions. These results can contribute to excipients selection for the encapsulation of labile biomolecules in Ca(II)-alginate beads subjected to freezing and drying.
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Affiliation(s)
- Tatiana Rocio Aguirre Calvo
- Departamentos de Industrias y Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
- Instituto de Tecnología de Alimentos y Procesos Químicos (ITAPROQ), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Patricio R. Santagapita
- Departamentos de Industrias y Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
- Instituto de Tecnología de Alimentos y Procesos Químicos (ITAPROQ), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
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Ozu M, Galizia L, Acuña C, Amodeo G. Aquaporins: More Than Functional Monomers in a Tetrameric Arrangement. Cells 2018; 7:E209. [PMID: 30423856 PMCID: PMC6262540 DOI: 10.3390/cells7110209] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [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: 09/29/2018] [Revised: 10/27/2018] [Accepted: 11/07/2018] [Indexed: 12/11/2022] Open
Abstract
Aquaporins (AQPs) function as tetrameric structures in which each monomer has its own permeable pathway. The combination of structural biology, molecular dynamics simulations, and experimental approaches has contributed to improve our knowledge of how protein conformational changes can challenge its transport capacity, rapidly altering the membrane permeability. This review is focused on evidence that highlights the functional relationship between the monomers and the tetramer. In this sense, we address AQP permeation capacity as well as regulatory mechanisms that affect the monomer, the tetramer, or tetramers combined in complex structures. We therefore explore: (i) water permeation and recent evidence on ion permeation, including the permeation pathway controversy-each monomer versus the central pore of the tetramer-and (ii) regulatory mechanisms that cannot be attributed to independent monomers. In particular, we discuss channel gating and AQPs that sense membrane tension. For the latter we propose a possible mechanism that includes the monomer (slight changes of pore shape, the number of possible H-bonds between water molecules and pore-lining residues) and the tetramer (interactions among monomers and a positive cooperative effect).
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Affiliation(s)
- Marcelo Ozu
- Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina.
- Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1428EGA CABA, Argentina.
| | - Luciano Galizia
- Instituto de investigaciones Médicas A. Lanari, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires C1427ARO, Argentina.
- Consejo Nacional de Investigaciones Científicas y Técnicas, Laboratorio de Canales Iónicos, Instituto de Investigaciones Médicas (IDIM), Universidad de Buenos Aires, Buenos Aires C1427ARO, Argentina.
| | - Cynthia Acuña
- Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina.
- Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1428EGA CABA, Argentina.
| | - Gabriela Amodeo
- Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina.
- Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1428EGA CABA, Argentina.
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