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Mariotti VCBS, Naufal IZF, Amorim IAR, Parizi JLS, Nai GA. Digestive tract toxicity associated with exposure to 2,4-dichlorophenoxyacetic acid in rats. Braz J Med Biol Res 2022; 55:e12350. [PMID: 36102419 PMCID: PMC9467284 DOI: 10.1590/1414-431x2022e12350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Accepted: 07/11/2022] [Indexed: 11/21/2022] Open
Abstract
2,4-Dichlorophenoxyacetic acid (2,4-D) is a herbicide of the chlorophenoxy class and the second most widely used herbicide applied to several different crops worldwide. Environmental factors, especially those related to diet, strongly affect the risk of developing cancer of the gastrointestinal tract. There is currently no evidence to determine whether there is an association between 2,4-D exposure and gastrointestinal disorders. We evaluated the histological effect of chronic oral and inhalation exposure to 2,4-D on the digestive tract of rats. Eighty male adult albino Wistar rats were divided into 8 groups (n=10): two control groups, one for inhalation and one for oral exposure, and 6 groups exposed orally or by inhalation at three different concentrations of 2,4-D [3.71×10-3 grams of active ingredient per hectare (gai/ha), 6.19×10-3 gai/ha, and 9.28×10-3 gai/ha]. The animals were exposed for 6 months. The esophagus, stomach, and intestine were collected for histopathological analysis. Animals exposed to 2,4-D had hyperkeratosis of the esophagus, regardless of the exposure route. All animals exposed to a higher concentration of 2,4-D orally presented mild dysplasia of the large intestine. In the small intestine, most animals exposed to moderate and high concentrations of 2,4-D had mild dysplasia. No gastric changes were observed in any of the groups studied. Chronic exposure to 2,4-D, especially at moderate and high concentrations, regardless of the exposure route, caused reactive damage to the esophagus (hyperkeratosis) and dysplastic changes to the intestine.
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Affiliation(s)
- V C B S Mariotti
- Programa de Pós-Graduação em Ciências da Saúde, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil.,Departamento de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil.,Faculdade de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil
| | - I Z F Naufal
- Faculdade de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil
| | - I A R Amorim
- Faculdade de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil
| | - J L S Parizi
- Faculdade de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil.,Departamento de Patologia, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil
| | - G A Nai
- Programa de Pós-Graduação em Ciências da Saúde, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil.,Faculdade de Medicina, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil.,Departamento de Patologia, Universidade do Oeste Paulista, Presidente Prudente, SP, Brasil
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Bolani B, Oliveira GM, Dionísio TJ, Faria FAC, Fernandes MHR, Santos CF, Calvo AM. Pharmacogenetic and Pharmacokinetic Assays from Saliva Samples Can Guarantee Personalized Drug Prescription. Braz Dent J 2021; 32:3-8. [PMID: 33913999 DOI: 10.1590/0103-6440202104059] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 01/15/2021] [Indexed: 11/22/2022] Open
Abstract
Saliva is widely used for clinical and laboratory analysis. This study proposed to use DNA extracted from saliva for genotyping and pharmacokinetics of piroxicam. A fast and efficient genotyping method was used to determine relevant allelic variants of CYP2C9 (*2 and *3), since genetic factors can influence in non-steroidal anti-inflammatory drugs (NSAIDs) metabolization. DNA Extract All Reagents Kit® was used for DNA extraction and genotyping was performed using TaqMan® GTXpress™ Master Mix, SNP genotyping assays and a Viia7 Real-Time PCR system. Volunteers performed sequential collections of saliva samples before and after taking a single dose of piroxicam (0.25 to 72 h) which were used for pharmacokinetics assays. Piroxicam concentrations were analyzed using LC-MS/MS. Sixty-six percent of volunteers were ancestral homozygous (CYP2C9*1/*1), and 34% showed one or both polymorphisms. Of these 34%, 22 individuals showed CYP2C9*2 polymorphism, 8 CYP2C9*3, and 4 CYP2C9*2/*3. Piroxicam pharmacokinetics were performed in 5 subjects. Areas under the curve (AUC0-t(h*ng/mL)) for CYP2C9*1/*1, *1/*2 and *1/*3 were, respectively, 194.33±70.93, 166 and 303. Maximum concentrations (Cmax(ng/mL)) for these genotypes were respectively 6.46±2.56, 4.3 and 10.2. Saliva sampling was a very effective matrix for both pharmacogenetic and pharmacokinetic tests, ensuring the speed of the procedure and the well-being and agreement of the participants. Once having the knowledge about the slow and fast metabolizers, it is possible to make an adequate prescription in order to avoid the adverse effects of the medication and to guarantee greater analgesic comfort to the patients respectively.
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Affiliation(s)
- Bruna Bolani
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Gabriela Moraes Oliveira
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Thiago José Dionísio
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | | | | | - Carlos Ferreira Santos
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Adriana Maria Calvo
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
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Parizi JLS, de Mello Odorizzi GAS, Sato GMRH, Patrão IB, Nai GA. Oral mucosa changes associated with chronic oral and inhalation exposure to 2,4-dichlorophenoxiacetic acid (2,4-D) in Wistar rats. Toxicol Res (Camb) 2020; 9:746-757. [PMID: 33447360 PMCID: PMC7786168 DOI: 10.1093/toxres/tfaa085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 10/16/2020] [Accepted: 10/25/2020] [Indexed: 11/14/2022] Open
Abstract
The respiratory tract and the oral mucosa are the first areas contaminated by pesticides. The herbicide dichlorophenoxyacetic acid (2,4-D) is a widely used pesticide across the world for both crops and gardens. The aim of this study was to evaluate oral mucosal damage after an experimental simulation of chronic oral and inhalational environmental exposure to 2,4-D formulation. Eighty male Wistar rats were exposed to three distinct concentrations of 2,4-D formulation (low-187.17 mg/m3; medium-313.31 mg/m3; and high-467.93 mg/m3). Oral exposure (through contaminated feed) or inhalation exposure lasted 6 months. Rat tongues were collected for cyto- and histopathology. There was a difference between exposure groups in the intensity of tissue congestion. Most rats exposed to 2,4-D presented mucosal inflammation at both cytology and histology (P < 0.05). Hyperkeratosis only occurred in rats exposed orally at the high concentration. There was an increase in the number of nucleoli-organizing regions in the dorsal epithelium as the 2,4-D concentration increased (P < 0.001). The inhalation route was more associated with increased mitosis figures and nucleoli-organizing region count (P < 0.05). Chronic oral and inhalation exposure to high concentrations of 2,4-D formulation caused an increase in the proliferation rate and thickness of the tongue epithelium and stimulated the inflammatory response in the tissue.
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Affiliation(s)
- José Luiz Santos Parizi
- Department of Pathology, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
- Graduate Program in Animal Science, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
| | | | | | - Isabela Bocardi Patrão
- Dental College, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
| | - Gisele Alborghetti Nai
- Department of Pathology, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
- Graduate Program in Animal Science, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
- Dental College, Universidade do Oeste Paulista (UNOESTE), Presidente Prudente, São Paulo 19050-680, Brazil
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