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Matias D, Sisnande T, Martins A, do Amaral M, Santos B, Miranda A, Lima L. Dietary phytate induces subclinical mechanical allodynia in mice. Braz J Med Biol Res 2023; 56:e12955. [PMID: 37937602 PMCID: PMC10695159 DOI: 10.1590/1414-431x2023e12955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 09/25/2023] [Indexed: 11/09/2023] Open
Abstract
Neuropathic pain is a condition with varying origins, including reduced dietary micronutrient intake. Phytate is a polyphosphate found in seeds and grains that can act as an antinutrient due to the ability of sequester essential divalent metals. Here we tested whether moderate dietary phytate intake could alter nociceptive pain. We subjected weaning mice to a chow supplemented with 1% phytate for eight weeks. Body weight gain, glycemic responses, food ingestion, water ingestion, and liver and adipose tissue weights were not altered compared to controls. We observed a decreased mechanical allodynia threshold in the intervention group, although there were no changes in heat- or cold-induced pain. Animals consuming phytate showed reduced spinal cord tumor necrosis factor (TNF), indicating altered inflammatory process. These data provide evidence for a subclinical induction of mechanical allodynia that is independent of phytate consumption in animals with otherwise normal phenotypic pattern.
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Affiliation(s)
- D.O. Matias
- Laboratório de Biotecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Laboratório de Estudos em Farmacologia Experimental, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-Graduação em Química Biológica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - T. Sisnande
- Laboratório de Biotecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-Graduação em Química Biológica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - A.F. Martins
- Laboratório de Estudos em Farmacologia Experimental, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - M.J. do Amaral
- Programa de Pós-Graduação em Química Biológica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - B.L.R. Santos
- Laboratório de Estudos em Farmacologia Experimental, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - A.L.P. Miranda
- Laboratório de Estudos em Farmacologia Experimental, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
| | - L.M.T.R. Lima
- Laboratório de Biotecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-Graduação em Química Biológica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
- Laboratório de Macromoléculas, Instituto Nacional de Metrologia, Qualidade e Tecnologia, Duque de Caxias, RJ, Brasil
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Silva-Jr H, Araújo TS, da Silva Almeida M, Scapin SMN, Lima LMTR. Formation of subvisible particles in commercial insulin formulations. Colloids Surf B Biointerfaces 2022; 216:112566. [PMID: 35623256 DOI: 10.1016/j.colsurfb.2022.112566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 05/08/2022] [Accepted: 05/10/2022] [Indexed: 12/01/2022]
Abstract
The conformation and assembly of insulin are sensitive to physical and chemical variables. Insulin can misfold and form both amorphous and amyloid aggregates. Localized cutaneous amyloidosis due to insulin usage has been reported, and question remains regarding its stability in the original flasks due to storage and handling. Here we report the evaluation of the formation of aggregates in insulin formulations upon once-weekly handling and storage of the in-use cartridges at 4 °C or 37 °C for 5 weeks. Electrospray ionization mass spectrometry showed no obvious chemical decomposition. No major changes in oligomeric distribution were observed by size-exclusion chromatography. Dynamic light scattering allowed the identification of particles with high hydrodynamic radius formed during storage at 4 °C and 37 °C. Transmission electron microscopy analysis revealed the formation of amorphous material, with no clear evidence for amyloid material up to 28 days of incubation. These data support evidences for the formation of subvisible and submicrometer amorphous particulate matter in insulin formulations shortly upon use.
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Affiliation(s)
- Hamilton Silva-Jr
- Laboratory for Pharmaceutical Biotechnology - pbiotech, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Talita S Araújo
- Laboratory for Pharmaceutical Biotechnology - pbiotech, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Protein Advanced Biochemistry - PAB, National Center for Structural Biology and Bioimaging - CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Marcius da Silva Almeida
- Protein Advanced Biochemistry - PAB, National Center for Structural Biology and Bioimaging - CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Institute for Medical Biochemistry Leopoldo De Meis, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Sandra M N Scapin
- National Institute of Metrology, Quality and Technology - INMETRO, Duque de Caxias, RJ 25250-020, Brazil.
| | - Luís Maurício T R Lima
- Laboratory for Pharmaceutical Biotechnology - pbiotech, Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; National Institute of Metrology, Quality and Technology - INMETRO, Duque de Caxias, RJ 25250-020, Brazil.
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