|
1
|
Frangopoulos T, Marinopoulou A, Goulas A, Likotrafiti E, Rhoades J, Petridis D, Kannidou E, Stamelos A, Theodoridou M, Arampatzidou A, Tosounidou A, Tsekmes L, Tsichlakis K, Gkikas G, Tourasanidis E, Karageorgiou V. Optimizing the Functional Properties of Starch-Based Biodegradable Films. Foods 2023; 12:2812. [PMID: 37509904 PMCID: PMC10379345 DOI: 10.3390/foods12142812] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 06/15/2023] [Revised: 07/10/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
A definitive screening design was used in order to evaluate the effects of starch, glycerol and montmorillonite (MMT) concentrations, as well as the drying temperature, drying tray type and starch species, on packaging film's functional properties. Optimization showed that in order to obtain films with the minimum possible thickness, the maximum elongation at break, the maximum tensile strength, as well as reduced water vapor permeability and low opacity, a combination of factors should be used as follows: 5.5% wt starch concentration, 30% wt glycerol concentration on a dry starch basis, 10.5% wt MMT concentration on a dry starch basis, 45 °C drying temperature, chickpea as the starch species and plexiglass as the drying tray type. Based on these results, starch films were prepared, and fresh minced meat was stored in them for 3 days. It was shown that the incorporation of MMT at 10.5% wt on a dry starch basis in the packaging films led to a decreased mesophilic and psychrotrophic bacteria growth factor compared to commercial packaging. When assessed for their biodegradability, the starch films disintegrated after 10 days of thermophilic incubation under simulated composting conditions. Finally, to prove their handling capability during industrial production, the starch films were rewound in a paper cylinder using an industrial-scale rewinding machine.
Collapse
Affiliation(s)
- Theofilos Frangopoulos
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Anna Marinopoulou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Athanasios Goulas
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Eleni Likotrafiti
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Jonathan Rhoades
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Dimitrios Petridis
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Eirini Kannidou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Alexios Stamelos
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Maria Theodoridou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Athanasia Arampatzidou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Alexandra Tosounidou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Lazaros Tsekmes
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Konstantinos Tsichlakis
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| | - Giorgos Gkikas
- A. Hatzopoulos SA, Stadiou 21, Kalohori, 57009 Thessaloniki, Greece
| | | | - Vassilis Karageorgiou
- Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece
| |
Collapse
|
|
2
|
Ioannou LG, Testa DJ, Tsoutsoubi L, Mantzios K, Gkikas G, Agaliotis G, Nybo L, Babar Z, Flouris AD. Migrants from Low-Income Countries have Higher Heat-Health Risk Profiles Compared to Native Workers in Agriculture. J Immigr Minor Health 2023:10.1007/s10903-023-01493-2. [PMID: 37208495 DOI: 10.1007/s10903-023-01493-2] [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] [Accepted: 04/30/2023] [Indexed: 05/21/2023]
Abstract
The present observational study was conducted to uncover potential differences in the risk of experiencing high occupational heat strain during agriculture work between migrants and their native coworkers, as well as to elucidate the factors that may contribute to such differences. The study took place over the period from 2016 through 2019 and involved monitoring 124 experienced and acclimatized individuals from high-income (HICs), upper-middle-income (UMICs), as well as lower-middle- and low-income (LMICs) countries. Baseline self-reported data for age, body stature, and body mass were collected at the start of the study. Second-by-second video recordings throughout the work shifts were captured using a video camera and were used to estimate workers' clothing insulation, covered body surface area, and body posture, as well as to calculate their walking speed, the amount of time they spent on different activities (and their intensity) and unplanned breaks throughout their work shifts. All information derived from the video data was used to calculate the physiological heat strain experienced by the workers. The core temperature of migrant workers from LMICs (37.81 ± 0.38 °C) and UMICs (37.71 ± 0.35 °C) was estimated to be significantly higher compared to the core temperature of native workers from HICs (37.60 ± 0.29 °C) (p < 0.001). Moreover, migrant workers from LMICs faced a 52% and 80% higher risk for experiencing core body temperature above the safety threshold of 38 °C compared to migrant workers from UMICs and native workers from HICs, respectively. Our findings show that migrant workers originating from LMICs experience higher levels of occupational heat strain, as compared to migrant workers from UMICs and native workers from HICs, because they take fewer unplanned breaks during work, they work at a higher intensity, they wear more clothing, and they have a smaller body size.
Collapse
Affiliation(s)
- Leonidas G Ioannou
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Davide J Testa
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Lydia Tsoutsoubi
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Konstantinos Mantzios
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Giorgos Gkikas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Gerasimos Agaliotis
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece
| | - Lars Nybo
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, Copenhagen, Denmark
| | - Zahra Babar
- Center for International and Regional Studies, Georgetown University, Doha, Qatar
| | - Andreas D Flouris
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece.
| |
Collapse
|
|
3
|
Ioannou LG, Tsoutsoubi L, Mantzios K, Gkikas G, Piil JF, Dinas PC, Notley SR, Kenny GP, Nybo L, Flouris AD. The Impacts of Sun Exposure on Worker Physiology and Cognition: Multi-Country Evidence and Interventions. Int J Environ Res Public Health 2021; 18:7698. [PMID: 34300148 PMCID: PMC8303297 DOI: 10.3390/ijerph18147698] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 07/12/2021] [Accepted: 07/14/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND A set of four case-control (n = 109), randomized-controlled (n = 7), cross-sectional (n = 78), and intervention (n = 47) studies was conducted across three countries to investigate the effects of sun exposure on worker physiology and cognition. METHODS Physiological, subjective, and cognitive performance data were collected from people working in ambient conditions characterized by the same thermal stress but different solar radiation levels. RESULTS People working under the sun were more likely to experience dizziness, weakness, and other symptoms of heat strain. These clinical impacts of sun exposure were not accompanied by changes in core body temperature but, instead, were linked with changes in skin temperature. Other physiological responses (heart rate, skin blood flow, and sweat rate) were also increased during sun exposure, while attention and vigilance were reduced by 45% and 67%, respectively, compared to exposure to a similar thermal stress without sunlight. Light-colored clothes reduced workers' skin temperature by 12-13% compared to darker-colored clothes. CONCLUSIONS Working under the sun worsens the physiological heat strain experienced and compromises cognitive function, even when the level of heat stress is thought to be the same as being in the shade. Wearing light-colored clothes can limit the physiological heat strain experienced by the body.
Collapse
Affiliation(s)
- Leonidas G. Ioannou
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, 2100 Copenhagen, Denmark; (J.F.P.); (L.N.)
| | - Lydia Tsoutsoubi
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
| | - Konstantinos Mantzios
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
| | - Giorgos Gkikas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
| | - Jacob F. Piil
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, 2100 Copenhagen, Denmark; (J.F.P.); (L.N.)
| | - Petros C. Dinas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
| | - Sean R. Notley
- Human and Environmental Physiology Research Unit, Faculty of Health Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada; (S.R.N.); (G.P.K.)
| | - Glen P. Kenny
- Human and Environmental Physiology Research Unit, Faculty of Health Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada; (S.R.N.); (G.P.K.)
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
| | - Lars Nybo
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, 2100 Copenhagen, Denmark; (J.F.P.); (L.N.)
| | - Andreas D. Flouris
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (L.T.); (K.M.); (G.G.); (P.C.D.)
- Human and Environmental Physiology Research Unit, Faculty of Health Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada; (S.R.N.); (G.P.K.)
| |
Collapse
|
|
4
|
Ioannou LG, Mantzios K, Tsoutsoubi L, Nintou E, Vliora M, Gkiata P, Dallas CN, Gkikas G, Agaliotis G, Sfakianakis K, Kapnia AK, Testa DJ, Amorim T, Dinas PC, Mayor TS, Gao C, Nybo L, Flouris AD. Occupational Heat Stress: Multi-Country Observations and Interventions. Int J Environ Res Public Health 2021; 18:6303. [PMID: 34200783 PMCID: PMC8296111 DOI: 10.3390/ijerph18126303] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 05/25/2021] [Accepted: 06/07/2021] [Indexed: 12/20/2022]
Abstract
BACKGROUND Occupational heat exposure can provoke health problems that increase the risk of certain diseases and affect workers' ability to maintain healthy and productive lives. This study investigates the effects of occupational heat stress on workers' physiological strain and labor productivity, as well as examining multiple interventions to mitigate the problem. METHODS We monitored 518 full work-shifts obtained from 238 experienced and acclimatized individuals who work in key industrial sectors located in Cyprus, Greece, Qatar, and Spain. Continuous core body temperature, mean skin temperature, heart rate, and labor productivity were collected from the beginning to the end of all work-shifts. RESULTS In workplaces where self-pacing is not feasible or very limited, we found that occupational heat stress is associated with the heat strain experienced by workers. Strategies focusing on hydration, work-rest cycles, and ventilated clothing were able to mitigate the physiological heat strain experienced by workers. Increasing mechanization enhanced labor productivity without increasing workers' physiological strain. CONCLUSIONS Empowering laborers to self-pace is the basis of heat mitigation, while tailored strategies focusing on hydration, work-rest cycles, ventilated garments, and mechanization can further reduce the physiological heat strain experienced by workers under certain conditions.
Collapse
Affiliation(s)
- Leonidas G. Ioannou
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, 2100 Copenhagen, Denmark;
| | - Konstantinos Mantzios
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Lydia Tsoutsoubi
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Eleni Nintou
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Maria Vliora
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Paraskevi Gkiata
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Constantinos N. Dallas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Giorgos Gkikas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Gerasimos Agaliotis
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Kostas Sfakianakis
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Areti K. Kapnia
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Davide J. Testa
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Tânia Amorim
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Petros C. Dinas
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| | - Tiago S. Mayor
- SIMTECH Laboratory, Transport Phenomena Research Centre, Engineering Faculty of Porto University, 4200-465 Porto, Portugal;
| | - Chuansi Gao
- Thermal Environment Laboratory, Division of Ergonomics and Aerosol Technology, Department of Design Sciences, Faculty of Engineering, Lund University, 22100 Lund, Sweden;
| | - Lars Nybo
- Department of Nutrition, Exercise and Sports, August Krogh Building, University of Copenhagen, 2100 Copenhagen, Denmark;
| | - Andreas D. Flouris
- FAME Laboratory, Department of Physical Education and Sport Science, University of Thessaly, 42100 Trikala, Greece; (L.G.I.); (K.M.); (L.T.); (E.N.); (M.V.); (P.G.); (C.N.D.); (G.G.); (G.A.); (K.S.); (A.K.K.); (D.J.T.); (T.A.); (P.C.D.)
| |
Collapse
|
|
5
|
Bekas DG, Gkikas G, Maistros GM, Paipetis AS. On the use of dielectric spectroscopy for the real time assessment of the dispersion of carbon nanotubes in epoxy. RSC Adv 2016. [DOI: 10.1039/c6ra15594d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the on line monitoring of the dispersion of carbon nanotubes in a typical aerospace epoxy system via dielectric spectroscopy.
Collapse
Affiliation(s)
- D. G. Bekas
- Dept of Materials Science & Engineering
- Univ. of Ioannina
- 45110 Ioannina
- Greece
| | - G. Gkikas
- Dept of Materials Science & Engineering
- Univ. of Ioannina
- 45110 Ioannina
- Greece
| | | | - A. S. Paipetis
- Dept of Materials Science & Engineering
- Univ. of Ioannina
- 45110 Ioannina
- Greece
| |
Collapse
|
|
6
|
Papanikolaou N, Darlametsos I, Tsipas G, Morphake P, Bokas S, Gkikas G, Hornych A, Bariety J, Gkika EL, Karageorgou I, Patsialos K. Effects of OKY-046 and nifedipine in cyclosporine-induced renal dysfunction in rats. Prostaglandins Leukot Essent Fatty Acids 1996; 55:249-56. [PMID: 8951993 DOI: 10.1016/s0952-3278(96)90005-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Cyclosporine (CsA) (37.4 mumol/kg per day for 7 days) treated female Wistar rats exhibited significantly decreased creatinine clearance (Ccr) and body weight loss (BWL), but had neither proteinuria (PU) nor alteration in their urine volume (V). Light microscopic (LM) sections of rat kidneys showed that all kidneys were affected by lesions, mainly diffuse vacuolization. These changes were associated with decreased urinary excretion ratios of 6-ketoprostaglandin F1 alpha to thromboxane B2 (6kPGF1 alpha/TXB2) and prostaglandin E2 to TXB2 (PGE2/TXB2). When OKY-046, a TXA2-synthetase inhibitor or nifedipine (NFD), a calcium channel blocker and an antagonist of endotheline (ET), were administered in addition to CsA, they restored Ccr and increased urine V but they did not prevent BWL. LM sections showed that only 5 or 7 out of 9 kidneys of animals were affected, respectively. These changes were associated with prevention of the diminished ratios of urinary PGE2/TXB2 and 6kPGF1 alpha/TXB2 mainly in the OKY-046 treated animals. In conclusion, our results suggest that inhibitors of TXA2 or antagonists and/or inhibitors of endothelin play a protective role in the development of the dysfunction induced by CsA. However, the protection observed using OKY-046 and NFD did not reach that obtained by evening primrose oil (EPO) or Ketanserine (KTS), substances which prevented the fall of Ccr and BWL. Furthermore, with these protective agents only 5 out of 9 kidneys were affected and the lesions were of minor importance.
Collapse
Affiliation(s)
- N Papanikolaou
- Centre Franco-Hellenique de Recherches Biomedicales, Hôpital Général d'Agrinion, Greece
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
|
7
|
Darlametsos I, Morphake P, Bariety J, Hornych A, Tsipas G, Gkikas G, Papanikolaou N. Effect of ketanserine in cyclosporine-induced renal dysfunction in rats. Nephron Clin Pract 1995; 70:249-54. [PMID: 7566312 DOI: 10.1159/000188592] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Cyclosporine (CsA)-treated female Wistar rats, in dose of 37.5 microM (45 mg)/kg/day for 7 days, exhibited significantly decreased creatinine clearance (Ccr), and provoked body weight loss (BWL), which is consistent with the development of nephrotoxicity (NT). Urine volume (V) did not change and proteinuria (PU) was not provoked. These changes were associated with significantly diminished ratios of urinary PGE2/TXB2 and 6kPGF1 alpha/TXB2 excretions. Light-microscopic (LM) sections of rat kidneys showed that all kidneys were affected but the lesions (mainly diffuse vacuolization) were reversible. When CsA-treated animals were pretreated with ketanserine (KTS), which antagonizes (a) the direct vasoconstrictor effect of serotonin (5-HT), and (b) the amplifying effects of 5-HT on other vasoactive substances (such as noradrenaline (NA), alpha 1-receptors, histamine, H2 receptors, and prostaglandin F2 alpha), Ccr and urine volume significantly increased, BWL was partially prevented and the ratios of urinary PGE2/TXB2 and 6kPGF1 alpha/TXB2 excretions were significantly enhanced. LM sections showed that only 5 of 9 rats were affected but the lesions were of less importance. These observations indicate that the NT induced by CsA in our studies was mediated by 5-HT, a potent vasoconstrictor agent, and by the metabolites of arachidonic acid. However, other vasoactive agents and additional mechanisms could also be implicated.
Collapse
Affiliation(s)
- I Darlametsos
- Centre Franco-Hellénique de Recherches Biomédicales (Hormones Vasoactives et Natriurétiques), Hôpital Général d'Agrinion, Greece
| | | | | | | | | | | | | |
Collapse
|
|
8
|
Morphake P, Bariety J, Darlametsos I, Tsipas G, Gkikas G, Hornysh A, Papanikolaou N. Alteration of cyclosporine (CsA)-induced nephrotoxicity by gamma linolenic acid (GLA) and eicosapentaenoic acid (EPA) in Wistar rats. Prostaglandins Leukot Essent Fatty Acids 1994; 50:29-35. [PMID: 8146206 DOI: 10.1016/0952-3278(94)90102-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Administration of cyclosporine (CsA), 37.4 microM (45 mg)/Kg, per day for 7 days, to Wistar rats, induced decreased creatinine clearance (Ccr) and body weight loss (BWL), but it did not induce proteinuria. These changes were associated with enhanced urinary thromboxane B2 (TXB2) and diminished 6-keto-PGF1 alpha (6kPGF1 alpha) and prostaglandin E2 (PGE2) excretions. The augmentation in TXB2 and the decrease in PGs highly diminished the ratios of 6kPGF1 alpha/TXB2 and PGE2/TXB2. In microscopic sections all of the kidneys were affected to variable degrees. When CsA was administered to animals fed for 70 days, prior to the experiment, on standard chow (SC) containing evening primrose oil (EPO) or fish oil (FO), 1% and 10% respectively (EPO contained 9% gamma-linolenic acid (GLA) and FO 5.6% eicosapentaenoic acid (EPA)), the nephrotoxic effect of CsA was partially prevented. These changes were accompanied by increased ratios of urinary 6kPGF1 alpha/TXB2 and PGE2/TXB2 excretions. Light microscopic (LM) studies showed that rats' kidneys fed on SC containing EPO or FO were not always affected and the lesions were of minor importance. In conclusion, these results suggest that EPO (GLA) and FO (EPA) could play a beneficial role in the development or the modulation of the renal syndrome induced by CsA.
Collapse
Affiliation(s)
- P Morphake
- Centre Franco-Hellenique de Recherche Biomedicale Hormones Vasoactives et Natriuretiques, Hopital General d'Agrinion, Hellas, Greece
| | | | | | | | | | | | | |
Collapse
|
|
9
|
Papanikolaou N, Peros G, Morphake P, Gkikas G, Maraghianne D, Tsipas G, Kostopoulos K, Arambatze C, Gkika EL, Bariety J. Does gentamicin induce acute renal failure by increasing renal TXA2 synthesis in rats? Prostaglandins Leukot Essent Fatty Acids 1992; 45:131-6. [PMID: 1561232 DOI: 10.1016/0952-3278(92)90229-c] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Acute renal failure (ARF) induced with large doses of Gentamicin (GM) (an aminoglycoside) was associated with increased urinary TXB (TXA) excretion which provoked a decrease of the ratios of urinary PGE2/TXB2 and 6-keto-PGF1 alpha (PGI2)/TXB2 excretions. Furthermore, as indicated by light microscopy most of the epithelial cells lining the proximal tubules show obvious lesions varying from swelling of their cytoplasm to complete necrosis. Either the inhibitor, OKY-O46, of TXA-synthetase, or volume expansion (VE) with isotonic saline (IS) of the experimental animals diminished urinary TXB excretion which provoked 1) augmentation of the ratios of urinary PGE/TXB and 6-keto-PGF1 alpha/TXB excretions, 2) elevation of creatinine clearance (Ccr) and 3) diminution of proteinuria (PU). This protection against ARF-by OKY-O46 and VE can a can be seen in microscopic sections where necrosis of proximal tubules is almost absent. Only a few proximal tubules show swelling of their epithelial cells and some focal areas of tubule necrosis. We suggest that the metabolites of arachidonic acid (AA), TXA2 a (potent vasoconstrictor agent) and prostaglandins (PGE2 and PGI2), (potent vasodilator factors), play an important role in the development (TXA2) or in the prevention (PGs) of ARF induced by this antibiotic.
Collapse
Affiliation(s)
- N Papanikolaou
- Centre Franco-Hellenique de Diagnostic et de Recherche Biomedicale, Hopital General Agrinon, Grece/Hellas
| | | | | | | | | | | | | | | | | | | |
Collapse
|
|
10
|
Papanicolaou N, Hatziantoniou C, Dontas A, Gkikas EL, Paris M, Gkikas G, Bariety J. Is thromboxane a potent antinatriuretic factor and is it involved in the development of acute renal failure? Nephron Clin Pract 1987; 45:277-82. [PMID: 3587466 DOI: 10.1159/000184163] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Glycerol-treated rats exhibited significantly increased urinary thromboxane B2(TXB)2, prostaglandin E2 (PGE2) and 6-ketoprostaglandin F1 alpha (6kPGF1 alpha) excretion and urine volume (UV). These increases were associated with significant decreases in creatinine clearance (CCr), urinary sodium concentration (UNa), urinary sodium excretion (UNaV), and fractional excretion of sodium (FENa%), which is consistent with the development of the prerenal (reversible) phase of acute renal failure (ARF). When glycerol-treated rats were pretreated with a selective inhibitor of thromboxane A2 (TXA2) synthesis (imidazole), urinary PGE2 and 6kPGF1 alpha excretion and UV remained unchanged, whereas CCr, UNa, UNaV decreases were partially prevented. Additionally, FENa% was increased, indicating inhibition of sodium reabsorption. The findings indicate that inhibition of TXA2 synthesis increases UNaV and partially improves CCr in glycerol-treated rats. Further histologic observation and functional follow-up over longer periods of time are needed to clarify the role of TXA2 in the development of ARF.
Collapse
|
|
11
|
Papanicolaou N, Gkika EL, Gkikas G, Bariety J. Selective inhibition of renal thromboxane biosynthesis increased sodium excretion rate in normal and saline-loaded rats. Clin Sci (Lond) 1985; 68:79-82. [PMID: 3880524 DOI: 10.1042/cs0680079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The excretion rates of renal thromboxane B2 (TXB2) and 6-ketoPGF1 alpha, the stable chemical metabolites of thromboxane A2 (TXA2) and prostaglandin I2 (PGI2) respectively, PGE2 and sodium were determined in normal and saline-loaded rats treated with the thromboxane synthetase inhibitor imidazole. In normal rats the administration of imidazole in doses which did not affect renal 6-keto-PGF1 alpha and PGE2 excretion but selectively inhibited renal TXB2 excretion, significantly increased the sodium excretion rate. Volume expansion with saline increased renal PGE2 and 6-ketoPGF1 alpha excretion but did not alter renal TXB2 excretion. The increase in renal prostaglandin excretion was accompanied by an increased sodium excretion rate. The administration of imidazole to saline-loaded animals also decreased renal TXB2 excretion but did not alter the increased excretion of renal PGE2 and 6-ketoPGF1 alpha. This reduction in renal thromboxane biosynthesis by imidazole further increased the sodium excretion rate. We suggest that TXA2 is a potent antinatriuretic factor as well as the most potent vasoconstrictor agent known.
Collapse
|