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Komatsu D, Cabrera ARE, Quevedo BV, Asami J, Cristina Motta A, de Moraes SC, Duarte MAT, Hausen MDA, Aparecida de Rezende Duek E. Meniscal repair with additive manufacture of bioresorbable polymer: From physicochemical characterization to implantation of 3D printed poly (L-co-D, L lactide-co-trimethylene carbonate) with autologous stem cells in rabbits. J Biomater Appl 2024:8853282241248517. [PMID: 38646887 DOI: 10.1177/08853282241248517] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
Three-dimensional (3D) structures are actually the state-of-the-art technique to create porous scaffolds for tissue engineering. Since regeneration in cartilage tissue is limited due to intrinsic cellular properties this study aims to develop and characterize three-dimensional porous scaffolds of poly (L-co-D, L lactide-co-trimethylene carbonate), PLDLA-TMC, obtained by 3D fiber deposition technique. The PLDLA-TMC terpolymer scaffolds (70:30), were obtained and characterized by scanning electron microscopy, gel permeation chromatography, differential scanning calorimetry, thermal gravimetric analysis, compression mechanical testing and study on in vitro degradation, which showed its amorphous characteristics, cylindrical geometry, and interconnected pores. The in vitro degradation study showed significant loss of mechanical properties compatible with a decrease in molar mass, accompanied by changes in morphology. The histocompatibility association of mesenchymal stem cells from rabbit's bone marrow, and PLDLA-TMC scaffolds, were evaluated in the meniscus regeneration, proving the potential of cell culture at in vivo tissue regeneration. Nine New Zealand rabbits underwent total medial meniscectomy, yielding three treatments: implantation of the seeded PLDLA-TMC scaffold, implantation of the unseeded PLDLA-TMC and negative control (defect without any implant). After 24 weeks, the results revealed the presence of fibrocartilage in the animals treated with polymer. However, the regeneration obtained with the seeded PLDLA-TMC scaffolds with mesenchymal stem cells had become intimal to mature fibrocartilaginous tissue of normal meniscus both macroscopically and histologically. This study demonstrated the effectiveness of the PLDLA-TMC scaffold in meniscus regeneration and the potential of mesenchymal stem cells in tissue engineering, without the use of growth factors. It is concluded that bioresorbable polymers represent a promising alternative for tissue regeneration.
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Affiliation(s)
- Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
| | | | - Bruna Vanessa Quevedo
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, Brazil
| | - Jessica Asami
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of School of Mechanical Engineering (FEM), University of Campinas (UNICAMP), Campinas, Brazil
| | - Adriana Cristina Motta
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
| | | | | | - Moema de Alencar Hausen
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine (PPGBMR), Surgery Department, PUC-SP, Sorocaba, Brazil
| | - Eliana Aparecida de Rezende Duek
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba, Brazil
- Post-Graduation Program of School of Mechanical Engineering (FEM), University of Campinas (UNICAMP), Campinas, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine (PPGBMR), Surgery Department, PUC-SP, Sorocaba, Brazil
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Hausen MDA, Moraes ADS, Pedrini F, Grabarz F, Camilli JA, Duek EADR. Crosslinked Collagen-Hyaluronic Acid Scaffold Enhances Interleukin-10 Under Co-Culture of Macrophages And Adipose-Derived Stem Cells. Macromol Biosci 2024; 24:e2300270. [PMID: 37700543 DOI: 10.1002/mabi.202300270] [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: 06/19/2023] [Revised: 08/25/2023] [Indexed: 09/14/2023]
Abstract
The skin, the human body's largest organ, possesses a protective barrier that renders it susceptible to various injuries, including burns. Following burn trauma, the inflammatory process triggers both innate and adaptive immune responses, leading to the polarization of macrophages into two distinct phenotypes: the pro-inflammatory M1 and the anti-inflammatory M2. This dual response sets the stage for wound healing and subsequent tissue regeneration. Contributing to this transition from M1 to M2 polarization are human adipose-derived stem cells (ASCs), which employ paracrine signaling and inflammation suppression to enhance the remodeling phase. ASCs, when combined with biocompatible polymers, can be integrated into functional scaffolds. This study introduces an 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide-crosslinked (EDC-crosslinked) collagen-hyaluronic acid (Col-HA) scaffold assembled with ASCs, designed as a natural biomaterial device to modulate macrophage behavior in vitro under co-culture conditions. This innovation aims to improve wound healing processes. The EDC-crosslinked Col-HA scaffold favored the release of anti-inflammatory cytokines by ASCs, which indicated the M2 prevalence. In tissue engineering, a critical objective lies in the development of functional biomaterials capable of guiding specific tissue responses, notably the control of inflammatory processes. Thus, this research not only presents original findings but also points toward a promising avenue within regenerative medicine.
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Affiliation(s)
- Moema de Alencar Hausen
- Surgery Department, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo, Postgraduate Program in Biomaterials and Regenerative Medicine (PPBMR), Laboratory of Biomaterials, Sorocaba, 18030-070, Brazil
| | - Ariana de Souza Moraes
- Surgery Department, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo, Postgraduate Program in Biomaterials and Regenerative Medicine (PPBMR), Laboratory of Biomaterials, Sorocaba, 18030-070, Brazil
| | - Flavia Pedrini
- Surgery Department, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo, Postgraduate Program in Biomaterials and Regenerative Medicine (PPBMR), Laboratory of Biomaterials, Sorocaba, 18030-070, Brazil
- Center of Sciences and Technology for Sustainability, Federal University of São Carlos, Postgraduate Program in Biotechnology and Environmental Monitoring, Sorocaba, 18052-780, Brazil
| | - Felipe Grabarz
- Biotechnology Center, Butantan Institute, Laboratory of Vaccine Development, Sorocaba, 05508-040, Brazil
| | - José Angelo Camilli
- Department of Functional and Structural Biology, University of Campinas, Institute of Biology, Laboratory of Bone Regeneration and Plasticity, São Paulo, 13083-970, Brazil
| | - Eliana Aparecida de Rezende Duek
- Surgery Department, Faculty of Medical Sciences and Health, Pontifical Catholic University of São Paulo, Postgraduate Program in Biomaterials and Regenerative Medicine (PPBMR), Laboratory of Biomaterials, Sorocaba, 18030-070, Brazil
- Center of Sciences and Technology for Sustainability, Federal University of São Carlos, Postgraduate Program in Biotechnology and Environmental Monitoring, Sorocaba, 18052-780, Brazil
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Pinto MF, Quevedo BV, Asami J, Komatsu D, Hausen MDA, Duek EADR. Electrospun Membrane Based on Poly(L-co-D,L lactic acid) and Natural Rubber Containing Copaiba Oil Designed as a Dressing with Antimicrobial Properties. Antibiotics (Basel) 2023; 12:antibiotics12050898. [PMID: 37237801 DOI: 10.3390/antibiotics12050898] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Drug delivery systems of natural antimicrobial compounds, such as copaiba oil (CO), have become relevant in the scientific community due to the recent prevalence of the public health complications related to antibiotic resistance. Electrospun devices act as an efficient drug delivery system for these bioactive compounds, reducing systemic side effects and increasing the effectiveness of the treatment. In this way, the present study aimed to evaluate the synergistic and antimicrobial effect of the direct incorporation of different concentrations of CO in a poly(L-co-D,L lactic acid) and natural rubber (NR) electrospun membrane. It was observed that CO showed bacteriostatic and antibacterial effects against S. aureus in antibiogram assays. The prevention of biofilm formation was confirmed via scanning electron microscopy. The test with crystal violet demonstrated strong bacteria inhibition in membranes with 75% CO. A decrease in hydrophilicity, observed in the swelling test, presented that the addition of CO promotes a safe environment for the recovery of injured tissue while acting as an antimicrobial agent. In this way, the study showed strong bacteriostatic effects of the CO incorporation in combination with electrospun membranes, a suitable feature desired in wound dressings in order to promote a physical barrier with prophylactic antimicrobial properties to avoid infections during tissue healing.
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Affiliation(s)
- Marcelo Formigoni Pinto
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
| | - Bruna V Quevedo
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba 18052-780, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Jessica Asami
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Daniel Komatsu
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
| | - Moema de Alencar Hausen
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine, Surgery Department, FCMS, PUC-São Paulo, Sorocaba 18030-070, São Paulo, Brazil
| | - Eliana Aparecida de Rezende Duek
- Mechanical Engineering Faculty (FEM), State University of Campinas (UNICAMP), Campinas 13083-860, São Paulo, Brazil
- Post-Graduation Program in Materials Sciences (PPGCM), Federal University of São Carlos (UFSCar), Sorocaba 18052-780, São Paulo, Brazil
- Laboratory of Biomaterials, Faculty of Medical Sciences and Health (FCMS), Pontifical Catholic University of São Paulo (PUC-SP), Sorocaba 18030-070, São Paulo, Brazil
- Post-Graduation Program of Biomaterials and Regenerative Medicine, Surgery Department, FCMS, PUC-São Paulo, Sorocaba 18030-070, São Paulo, Brazil
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Hausen MDA, Melero AMG, Asami J, Ferreira LM, Gomes da Silva GB, Bissoli MCDA, Marcato VR, Nani BD, Rosalen PL, Alencar SMD, Botaro VR, Komatsu D, Senna A, Duek EADR. In vivo therapeutic evaluation of a cellulose acetate hydrogel cross linked with ethylenediaminetetraacetic-dianhydride containing propolis ethanolic-extract for treating burns. J BIOACT COMPAT POL 2022. [DOI: 10.1177/08839115221106869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An increasing interest in regenerative medicine has been an approach with natural products used for assorted skin treatments. Propolis from Apis mellifera species of bees have shown high acceptance due to antimicrobial and anti-inflammatory properties. However, just a few propolis types presents stronger effects in controlling inflammation. The current work describes an organic propolis recently isolated, named as OP6, that presented strong anti-inflammatory influences in vivo when associated with EDTA cross-linked hydrogel, used as a curative device in second-degree burns in a murine model. We developed a cellulose acetate hydrogel cross-linked with ethylenediaminetetraacetic dianhydride (HAC-EDTA) as a polymeric matrix for a bandage based on an ethanolic extract of propolis at 15%, 30%, and 60% (w/v) for treating second-degree burns. In vivo studies were carried out in Wistar rats divided into three groups: negative control (only lesion), positive control (lesion with HAC-EDTA film), and treatment group (lesion with the HAC-EDTA + OP6 at 15%, 30%, and 60%). Each group was randomized and equally subdivided into two subgroups according to the period of bandage wearing (7 and 14 days). Previous work of this research group selected the propolis OP6 sample source as the best candidate for the in vivo study. HAC-EDTA + OP6 15%, 30%, and 60% films demonstrated a concentration-dependent release rate, with the highest amount of propolis released after tests (484.3 mg) by HAC-EDTA enriched with the highest concentrated extract of propolis. HAC-EDTA + OP6 films were efficient in preventing infections, promoting lesion retraction, and tissue regeneration. The HAC-EDTA + OP6 30% treatment was more efficient, revealing a reduced inflammatory process and stimulating skin regeneration. The designed HAC-EDTA + propolis films were shown as promising tools for second-degree burns treatment, accelerating healing process to a full recovery tissue repair after 14 days.
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Affiliation(s)
- Moema de Alencar Hausen
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Anna Maria Gouvea Melero
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
| | - Jessica Asami
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
- Faculty of Mechanical Engineering, State University of Campinas (FEM/UNICAMP), São Paulo, Brazil
| | - Lucas Martins Ferreira
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Guilherme Borges Gomes da Silva
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Mariana Cesar de Azeredo Bissoli
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Vanessa Rigoni Marcato
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - Bruno Dias Nani
- Piracicaba Dental School, University of Campinas (FOP/UNICAMP), Piracicaba, São Paulo, Brazil
| | - Pedro Luiz Rosalen
- Piracicaba Dental School, University of Campinas (FOP/UNICAMP), Piracicaba, São Paulo, Brazil
| | - Severino Matias de Alencar
- Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil
| | - Vagner Roberto Botaro
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
- Post-Graduation Program in Materials Science (PPGCM), Federal University of São Carlos (UFSCAR), Sorocaba, São Paulo, Brazil
| | - Daniel Komatsu
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
| | - André Senna
- Department of Physics, Chemistry and Mathematics, Federal University of São Carlos (DFQM/UFSCAR), Sorocaba, São Paulo, Brazil
| | - Eliana Aparecida de Rezende Duek
- Biomaterial’s Laboratory, Medicine and Health Sciences Faculty, Pontifical Catholic University of São Paulo (PUC/SP), Sorocaba, São Paulo, Brazil
- Faculty of Mechanical Engineering, State University of Campinas (FEM/UNICAMP), São Paulo, Brazil
- Post-Graduation Program in Materials Science (PPGCM), Federal University of São Carlos (UFSCAR), Sorocaba, São Paulo, Brazil
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de Souza JF, da Silva Pontes K, Alves TFR, Torqueti de Barros C, Amaral VA, de Moura Crescencio KM, Rios AC, Batain F, Souto EB, Severino P, Komatsu D, de Alencar Hausen M, Chaud MV. Structural comparison, physicochemical properties, and in vitro release profile of curcumin-loaded lyotropic liquid crystalline nanoparticle: Influence of hydrotrope as interface stabilizers. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112861] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dos Anjos S, Mavropoulos E, Alves GG, Costa AM, de Alencar Hausen M, Spiegel CN, Longuinho MM, Mir M, Granjeiro JM, Rossi AM. Impact of crystallinity and crystal size of nanostructured carbonated hydroxyapatite on pre-osteoblast in vitro biocompatibility. J Biomed Mater Res A 2019; 107:1965-1976. [PMID: 31035306 DOI: 10.1002/jbm.a.36709] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 04/24/2019] [Indexed: 01/26/2023]
Abstract
Nanostructured carbonated hydroxyapatite (nCHA) is a promising biomaterial for bone tissue engineering due to its chemical properties, similar to those of the bone mineral phase and its enhanced in vivo bioresorption. However, the biological effects of nCHA nanoparticles on cells and tissues are not sufficiently known. This study assessed the impact of exposing pre-osteoblasts to suspensions with high doses of nCHA nanoparticles with high or low crystallinity. MC3T3-E1 pre-osteoblasts were cultured for 1 or 7 days in a culture medium previously exposed to CHA nanoparticles for 1 day. Control groups were produced by centrifugation for removal of bigger nCHA aggregates before exposure. Interaction of nanoparticles with the culture medium drastically changed medium composition, promoting Ca, P, and protein adsorption. Transmission Electron microscopy revealed that exposed cells were able to internalize both materials, which seemed concentrated inside endosomes. No cytotoxicity was observed for both materials, regardless of centrifugation, and the exposure did not induce alterations in the release of pro-and anti-inflammatory cytokines. Morphological analysis revealed strong interactions of nCHA aggregates with cell surfaces, however without marked alterations in morphological features and cytoskeleton ultrastructure. The overall in vitro biocompatibility of nCHA materials, regardless of physicochemical characteristics such as crystallinity, encourages further studies on their clinical applications.
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Affiliation(s)
- Suzana Dos Anjos
- Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Physics Research, Urca, Rio de Janeiro, Brazil
| | - Elena Mavropoulos
- Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Physics Research, Urca, Rio de Janeiro, Brazil
| | - Gutemberg G Alves
- Department of Cellular and Molecular Biology, Institute of Biology, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Andrea M Costa
- Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Physics Research, Urca, Rio de Janeiro, Brazil
| | - Moema de Alencar Hausen
- Biomaterial's Laboratory, Faculty of Medical Sciences, Pontifical Catholic University of São Paulo, Sorocaba, São Paulo, Brazil
| | - Carolina N Spiegel
- Department of Cellular and Molecular Biology, Institute of Biology, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil
| | - Mariana M Longuinho
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Rio de Janeiro, Brazil
| | - Mirta Mir
- Federal University of Alfenas, Exact Sciences Institute (ICEx) MG-Brasil, Alfenas, Brazil
| | - José M Granjeiro
- National Institute of Metrology, Duque de Caxias, Rio de Janeiro, Brazil
| | - Alexandre M Rossi
- Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Physics Research, Urca, Rio de Janeiro, Brazil
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Domingues CEC, Abdalla FC, Balsamo PJ, Pereira BVR, Hausen MDA, Costa MJ, Silva-Zacarin ECM. Thiamethoxam and picoxystrobin reduce the survival and overload the hepato-nephrocitic system of the Africanized honeybee. Chemosphere 2017; 186:994-1005. [PMID: 28835008 DOI: 10.1016/j.chemosphere.2017.07.133] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/30/2017] [Accepted: 07/22/2017] [Indexed: 06/07/2023]
Abstract
Apis mellifera perform important pollination roles in agroecosystems. However, there is often intensive use of systemic pesticides in crops, which can be carried to the colony by forage bees through the collection of contaminated pollen and nectar. Inside the colony, pollen loads are stored by bees that add honey and several enzymes to this pollen. Nevertheless, intra-colonial chronic exposure could induce sublethal effects in young bees exposed to a wide range of pesticides present in these pollen loads. This study was aimed to both determine the survival rate and evaluate the sublethal effects on the hepato-nephrocitic system in response to continuous oral exposure to lower concentrations of neonicotinoid thiamethoxam (TXT) and picoxystrobin fungicide (PXT). Exposure to a single chemical and co-exposure to both pesticides were performed in newly emerged honeybee workers. A significant decrease in the bee survival rates was observed following exposure to TXT (0.001 ng a.i./μL) and PXT (0.018 ng a.i./μL), as well as following co-exposure to TXT+PXT/2. After five days of continuous exposure, TXT induced sub-lethal effects in the organs involved in the detoxification of xenobiotics, such as the fat body and pericardial cells, and it also induced a significant increase in the hemocyte number. Thus, the hepato-nephrocitic system (HNS) reached the greatest level of activity of pericardial cells as an attempt to eliminate this toxic compound from hemolymph. The HNS was activated at low levels by PXT without an increase in the hemocyte number; however, the mobilization of neutral glycoconjugates from the trophocytes of the fat body was prominent only in this group. TXT and PXT co-exposure induced intermediary morphological effects in trophocytes and pericardial cells, but oenocytes from the fat body presented with atypical cytoplasm granulation only in this group. These data showed that the realistic concentrations of these pesticides are harmful to newly emerged Africanized honeybees, indicating that intra-colonial chronic exposure drastically reduces the longevity of bees exposed to neonicotinoid insecticide (TXT) and the fungicide strobilurin (PXT) as in single and co-exposure. Additionally, the sublethal effects observed in the organs constituting the HNS suggest that the activation of this system, even during exposure to low concentrations of theses pesticides, is an attempt to maintain homeostasis of the bees. These data together are alarming because these pesticides can affect the performance of the entire colony.
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Affiliation(s)
- Caio E C Domingues
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Biologia Estrutural e Funcional (LABEF), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Ecotoxicologia e Biomarcadores em Abelhas (LEBA), Sorocaba, SP, Brazil
| | - Fábio Camargo Abdalla
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Biologia Estrutural e Funcional (LABEF), Sorocaba, SP, Brazil.
| | - Paulo José Balsamo
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Biologia Estrutural e Funcional (LABEF), Sorocaba, SP, Brazil
| | - Beatriz V R Pereira
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Ecotoxicologia e Biomarcadores em Abelhas (LEBA), Sorocaba, SP, Brazil
| | - Moema de Alencar Hausen
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil
| | - Monica Jones Costa
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil
| | - Elaine C M Silva-Zacarin
- Universidade Federal de São Carlos (UFSCar), Programa de Pós-Graduação em Biotecnologia e Monitoramento Ambiental (PPGBMA), Sorocaba, SP, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Biologia (DBio), Laboratório de Ecotoxicologia e Biomarcadores em Abelhas (LEBA), Sorocaba, SP, Brazil
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Abi-Chahin TC, Hausen MDA, Mansano-Marques CM, Halfoun VLRDC. Microvascular reactivity in type 1 diabetics. ACTA ACUST UNITED AC 2010; 53:741-6. [PMID: 19893917 DOI: 10.1590/s0004-27302009000600008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Accepted: 04/23/2009] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To evaluate whether differences are present in microvascular response to the schemia induced by dynamic videocapillaroscopy (VCD), through analysis of the measured capillar transverse segment area (CTSA) in patients with type 1 diabetes mellitus (T1DM). METHODS The vascular reactivity of the CTSA was studied by VCD, using a reactive hyperemia test in 61 volunteers, being 31 healthy controls without diabetes family history (Group 1) and 30 patients with T1DM without complications (Group 2). The images were captured every two seconds, during reperfusion after one minute induced ischaemia, and they were analyzed by the program Studio Version 8 and Motic Image Plus. The pre-ischemia capillary transverse segment (basal area, BA), the maximum strain post-ischemia (maximum area, MA), and time to achieve it (MAt) were measured during reperfusion, and the increased area percentage (Ap) was estimated. RESULTS The mean differences between groups were evaluated by the t-test. The median comparisons between the groups were studied by the Mann-Whitney test. There was no difference in BA between the groups. The Ap was significantly lower among the diabetic patients, and there was a significant increase in the Mat among the patients of Group 2 when compared to Group 1. CONCLUSIONS These data suggest that type 1 diabetes provokes earlier endothelial dysfunction, before the onset of clinically detectable degenerative complications. The outcomes from these alterations need further studies.
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Abstract
OBJECTIVE Analysis of sperm heads using three different computer morphometrical tools and experimental conditions to find a more reliable and secure strategy among them. DESIGN Controlled experiments on sperm morphology analysis from volunteers. SETTING Laboratory of microscopy and imaging processing. PATIENT(S) Ten human semen samples donated by different zoospermic men. INTERVENTION(S) Semen samples were collected by masturbation after > or =72 hours of abstinence. MAIN OUTCOME MEASURE(S) Spermatozoon head morphology was compared by the use of different video-microscopy systems, three computer programs, and various staining conditions and manipulation by different operators. Nonbiological material in the form of latex beads was also used. RESULT(S) The data obtained suggest that the semiautomatic computer program is the most reliable and secure method for performing sperm analysis, besides the fact that it is a fast process compared with manual methods. CONCLUSION(S) Computer systems of sperm analysis should incorporate a step of interactive object identification to work properly, allowing the operator to confirm or correct possible computer misidentification. The latex beads were used to confirm the capability of all three computer programs to correctly evaluate nonbiological material.
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Affiliation(s)
- Ariadne Rodrigues Goulart
- Universidade do Estado do Rio de Janeiro, Departamento de Histologia e Embriologia, Laboratório de Microscopia e Processamento de Imagens, Rio de Janeiro, Brazil
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