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Morsi DS, Abu Quora HA, AboShabaan HS, El-Garawani IM, Abdel Moneim AE, Hathout HMR. Short-term immunotoxicity induced by florpyrauxifen-benzyl herbicide exposure in the spleen of male albino mice. JOURNAL OF EXPERIMENTAL ZOOLOGY. PART A, ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY 2024; 341:658-671. [PMID: 38594788 DOI: 10.1002/jez.2814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/17/2024] [Accepted: 03/21/2024] [Indexed: 04/11/2024]
Abstract
Florpyrauxifen-benzyl (FPB) is a new arylpicolinate systemic herbicide that has been used to control or suppress the majority of herbicide-resistant biotype weeds in rice. To our knowledge, the impact of FPB on the immune system remains undetected thus far. Hence, this work aimed to address the toxic effects of FPB and the possible related mechanisms on the spleen of exposed mice. Initially, an acute toxicological test was performed to ascertain the median lethal dose (LD50) of FPB for 24 h which was found to be 371.54 mg/kg b.wt. For mechanistic evaluation of FPB toxicity, three sublethal doses (1/20th, 1/10th, and 1/5th LD50) were orally administered to mice for 21 consecutive days. Changes in spleen relative weight, oxidative status, apoptotic and inflammatory markers, histopathological alterations were evaluated. Following the FPB exposure, significant (p < 0.05) decline in spleen index, apoptotic features, histolopathological changes were observed. Additionally, excessive oxidative stress in spleen tissues was monitored by downregulating antioxidant enzymes and upregulating the oxidant parameters. Furthermore, exposure to FPB resulted in notable activation of the NF-қB signaling pathway, accompanied by elevated levels of pro-inflammatory cytokines (namely, IL-1β and TNF-α) as well as CD3 and CD19 levels have decreased significantly in spleen tissues. Collectively, FPB exposure exhibited apoptosis, oxidative stress, immunosuppression, and inflammatory response in a dose-dependent manner, leading to spleen tissue damage and immunotoxicity. Further studies on FPB is recommended to outstand its hazards on ecosystems.
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Affiliation(s)
- Dalia S Morsi
- Zoology Department, Faculty of Science, Menoufia University, Shibin El Kom, Egypt
| | - Hagar A Abu Quora
- Zoology Department, Faculty of Science, Menoufia University, Shibin El Kom, Egypt
| | - Hind S AboShabaan
- Clinical Pathology Department, National Liver Institute Hospital, Menoufia University, Shebin El Kom, Egypt
| | - Islam M El-Garawani
- Zoology Department, Faculty of Science, Menoufia University, Shibin El Kom, Egypt
| | - Ahmed E Abdel Moneim
- Zoology and Entomology Department, Faculty of Science, Helwan University, Ain Helwan, Cairo, Egypt
| | - Heba M R Hathout
- Natural Resources Department, Faculty of African Postgraduate Studies, Cairo University, Giza, Egypt
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Avellaneda E, Lim A, Moeller S, Marquez J, Escalante Cobb P, Zambrano C, Patel A, Sanchez V, Godde K, Broussard C. HPTE-Induced Embryonic Thymocyte Death and Alteration of Differentiation Is Not Rescued by ERα or GPER Inhibition but Is Exacerbated by Concurrent TCR Signaling. Int J Mol Sci 2021; 22:ijms221810138. [PMID: 34576301 PMCID: PMC8471014 DOI: 10.3390/ijms221810138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 09/07/2021] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
Organochlorine pesticides, such as DDT, methoxychlor, and their metabolites, have been characterized as endocrine disrupting chemicals (EDCs); suggesting that their modes of action involve interaction with or abrogation of endogenous endocrine function. This study examined whether embryonic thymocyte death and alteration of differentiation induced by the primary metabolite of methoxychlor, HPTE, rely upon estrogen receptor binding and concurrent T cell receptor signaling. Estrogen receptor inhibition of ERα or GPER did not rescue embryonic thymocyte death induced by HPTE or the model estrogen diethylstilbestrol (DES). Moreover, adverse effects induced by HPTE or DES were worsened by concurrent TCR and CD2 differentiation signaling, compared with EDC exposure post-signaling. Together, these data suggest that HPTE- and DES-induced adverse effects on embryonic thymocytes do not rely solely on ER alpha or GPER but may require both. These results also provide evidence of a potential collaborative signaling mechanism between TCR and estrogen receptors to mediate adverse effects on embryonic thymocytes, as well as highlight a window of sensitivity that modulates EDC exposure severity.
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Affiliation(s)
- Eddie Avellaneda
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Atalie Lim
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Sara Moeller
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Jacqueline Marquez
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Priscilla Escalante Cobb
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Cristina Zambrano
- Department of Pharmacology, School of Medicine, University of California San Diego, La Jolla, CA 92093, USA;
| | - Aaditya Patel
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - Victoria Sanchez
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
| | - K. Godde
- Department of Sociology/Anthropology, University of La Verne, La Verne, CA 91750, USA;
| | - Christine Broussard
- Department of Biology, University of La Verne, La Verne, CA 91750, USA; (E.A.); (A.L.); (S.M.); (J.M.); (P.E.C.); (A.P.); (V.S.)
- Correspondence:
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3
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Iwano R, Iwashita N, Takagi Y, Fukuyama T. Estrogen receptor α activation aggravates imiquimod-induced psoriasis-like dermatitis in mice by enhancing dendritic cell interleukin-23 secretion. J Appl Toxicol 2020; 40:1353-1361. [PMID: 32368827 DOI: 10.1002/jat.3988] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/03/2020] [Accepted: 03/17/2020] [Indexed: 12/19/2022]
Abstract
Our recent study has reported that estrogen receptors (ERs) are involved in several types of allergy development. This study aims to investigate the possible relationship between ER activation and development of imiquimod-induced psoriasis-like dermatitis. A mouse model of imiquimod-induced psoriasis-like dermatitis was generated by 5 days of topical application of 5% of imiquimod cream on the back of the ear and the shaved back skin of male BALB/c mice. From the second day of applying 5% imiquimod cream, either ERα selective agonist (propylpyrazoletriol [PPT] 2.5 mg/kg) or ERβ selective agonist (diarylpropionitrile, DPN; 2.5 mg/kg) was administered orally for four consecutive days. Immediately after the final imiquimod cream application, scratching behavior was video monitored for 2 hours. The ear-swelling response was determined by comparing ear thickness before and after the final application of imiquimod cream. Twenty-four hours after the final imiquimod application, back skin tissue and auricular lymph nodes were isolated under isoflurane anesthesia. Oral administration of PPT significantly induced itch behavior and proinflammatory responses, including the levels of interleukin (IL)-17 and IL-22, whereas DPN treatment did not influence either pruritic or proinflammatory responses. In addition, IL-23 contribution by dendritic cells was identified using ER agonists on pretreated lipopolysaccharide (LPS)-stimulated murine bone marrow derived dendritic cells (BMDCs). PPT also significantly enhanced IL-23 secretion by LPS-stimulated BMDCs. Our findings indicate that the activation of ERα, but not ERβ, is directly associated with inflammatory and pruritic responses in a mouse model of the imiquimod-induced psoriasis by enhancing the secretion of IL-23 by dendritic cells.
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Affiliation(s)
- Rena Iwano
- Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara-shi, Kanagawa, Japan
| | - Naoki Iwashita
- Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara-shi, Kanagawa, Japan.,Bioalchemis, Tokyo, Japan
| | - Yoshiichi Takagi
- Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara-shi, Kanagawa, Japan.,Japan SLC,Inc., Shizuoka, Japan
| | - Tomoki Fukuyama
- Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara-shi, Kanagawa, Japan
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Leung-Gurung L, Escalante Cobb P, Mourad F, Zambrano C, Muscato Z, Sanchez V, Godde K, Broussard C. Methoxychlor metabolite HPTE alters viability and differentiation of embryonic thymocytes from C57BL/6 mice. J Immunotoxicol 2018; 15:104-118. [PMID: 29973080 DOI: 10.1080/1547691x.2018.1474978] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Endocrine-disrupting chemicals (EDC) are widespread in the built and natural environments. Heightened public awareness of their potential danger has led to concern about whether EDC and their metabolites have significant negative biological effects. Studies have shown that EDC like DDT and other organochlorine pesticides, such as methoxychlor (MXC), have adverse effects on immune cells, but no studies have addressed the impact of HPTE, the primary metabolite of MXC. To elucidate the presence and significance of HPTE adverse effects, this study explored the impact of HPTE on a critical window and component of immune system development, embryonic T-cell development. Lesions at this phase of development can lead to lifelong immune dysfunction and increased incidence of immune disease, such as autoimmunity. Embry-onic thymocytes (GD 16-18) from C57BL/6 mice were subjected to an in vitro differentiation culture that mimicked early steps in thymocyte development in the presence of 0.005, 0.05, 0.5, 5, or 50 μM HPTE, or a model endocrine disruptor, DES. The results indicated that compared to the vehicle control, HPTE- and DES-induced death of thymocytes. Annexin-V staining and Caspase 8, markers of programed cell death, revealed that the loss of cells was due at least in part to induction of apoptosis. Moreover, HPTE-induced cell death not only resulted in selective loss of double positive thymocytes, but also loss of developing CD4 intermediate cells (post-double positive partially differentiated thymocyte population). Phenotypic analysis of thymocyte maturation (T-cell receptor, TCR) and TCR ligation (CD5) surface markers revealed that surviving embryonic thymocytes expressed low levels of both. Taken together these data demonstrate that immature embryonic thymocytes are sensitive to HPTE exposure and that HPTE exposure targets thymocyte populations undergoing critical differentiation steps. These findings suggest HPTE may play a pivotal role in MXC exposure-induced immune dysfunction.
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Affiliation(s)
- Lucie Leung-Gurung
- a School of Community and Global Health , Claremont Graduate University , Claremont , CA , USA
| | | | - Faraj Mourad
- c Irvine Health, University of California , Orange , CA , USA
| | - Cristina Zambrano
- d Department of Pharmacology, School of Medicine , University of California San Diego , La Jolla , CA , USA
| | - Zachary Muscato
- e Department of Psychiatry, School of Medicine , Oregon Health and Science University , Portland , OR , USA
| | - Victoria Sanchez
- b Department of Biology , University of La Verne , La Verne , CA , USA
| | - Kanya Godde
- f Department of Sociology/Anthropology , University of La Verne , La Verne , CA , USA
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Watanabe Y, Tajiki-Nishino R, Tajima H, Fukuyama T. Role of estrogen receptors α and β in the development of allergic airway inflammation in mice: A possible involvement of interleukin 33 and eosinophils. Toxicology 2018; 411:93-100. [PMID: 30445053 DOI: 10.1016/j.tox.2018.11.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 10/31/2018] [Accepted: 11/12/2018] [Indexed: 01/21/2023]
Abstract
Recent studies have shown that the estrogen receptor α (ERα), but not ERβ, is involved in the proinflammatory and propruritic responses in cutaneous allergy. In addition, results from our recent study showed that while oral administration of the rather ERβ-selective agonist bisphenol A exacerbated the respiratory allergic inflammation, the potential inflammatory reaction in the skin was decreased after administration of bisphenol A. This study aimed to elucidate whether ERα and ERβ are involved in the progression of an allergic airway inflammation. We performed an in vivo experiment using an animal model of allergic airway inflammation using male BALB/c mice to confirm an increase in the proinflammatory response induced by propylpyrazoletriol (PPT), an ERα agonist, and diarylpropionitrile (DPN), an ERβ agonist. Oral administration of PPT or DPN showed a significant increase in the inflammation of the lung and infiltration of eosinophils. While the expression of Th2 cytokines such as interleukin 4 (IL-4) and IL-13 was not affected by exposure to PPT or DPN, administration of these agonists significantly increased the expression of IL-33. The mechanism underlying the development of such allergic inflammatory responses was determined by an in vitro study using the human bronchial epithelial cell line (BEAS-2B) and the human eosinophilic leukemia cell line (EoL-1). Activated cells were exposed to PPT or DPN for 24 h, and the cytokine levels were measured. The IL-33 levels in BEAS-2B cells increased significantly after exposure to PPT or DPN. In addition, pretreatment with PPT or DPN increased the expression of IL-8 in activated EoL-1 cells. Our findings indicate that ERα and ERβ are involved in the proinflammatory response in respiratory allergy, and their effects may be mediated by an increase in the expression of IL-33 and infiltration of eosinophils.
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Affiliation(s)
- Yuko Watanabe
- The Institute of Environmental Toxicology, 4321, Uchimoriya-machi, Joso-shi, Ibaraki, 303-0043, Japan.
| | - Risako Tajiki-Nishino
- The Institute of Environmental Toxicology, 4321, Uchimoriya-machi, Joso-shi, Ibaraki, 303-0043, Japan.
| | - Hitoshi Tajima
- The Institute of Environmental Toxicology, 4321, Uchimoriya-machi, Joso-shi, Ibaraki, 303-0043, Japan.
| | - Tomoki Fukuyama
- The Institute of Environmental Toxicology, 4321, Uchimoriya-machi, Joso-shi, Ibaraki, 303-0043, Japan; Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
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6
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Watanabe Y, Makino E, Tajiki-Nishino R, Koyama A, Tajima H, Ishimota M, Fukuyama T. Involvement of estrogen receptor α in pro-pruritic and pro-inflammatory responses in a mouse model of allergic dermatitis. Toxicol Appl Pharmacol 2018; 355:226-237. [DOI: 10.1016/j.taap.2018.07.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 06/30/2018] [Accepted: 07/09/2018] [Indexed: 10/28/2022]
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7
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Ali D, Tripathi A, Al Ali H, Shahi Y, Mishra KK, Alarifi S, Alkahtane AA, Manohardas S. ROS-dependent Bax/Bcl2 and caspase 3 pathway-mediated apoptosis induced by zineb in human keratinocyte cells. Onco Targets Ther 2018; 11:489-497. [PMID: 29416349 PMCID: PMC5788927 DOI: 10.2147/ott.s140358] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
There are a large number of agricultural workers who are exposed to pesticides through skin and inhalation. The best approach to identify altered molecular pathways during dermal exposure to pesticides is relevant to risk-associated concern about skin safety. In this study, we investigated the cytotoxic effect of zineb, a fungicide, in human keratinocyte (HaCaT) cells. HaCaT cells were treated with zineb (1–40 µg/mL) for 24 hours. Cellular and molecular mechanisms of cell toxicity were investigated through MTT and neutral red-uptake assays. Zineb reduced viability of HaCaT cells and induced apoptosis in a concentration-dependent manner. Zineb increased levels of Bax and caspase 3 and inhibited the level of Bcl2, which subsequently induced apoptosis via the Bax/Bcl2 and caspase pathway. Therefore, zineb could have induced apoptosis through the mitochondrial pathway in HaCaT cells. Our study suggests that zineb is cytotoxic to HaCaT cells via the induction of apoptosis and oxidative stress in vitro.
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Affiliation(s)
- Daoud Ali
- Department of Zoology, Science College, King Saud University, Riyadh, Saudi Arabia
| | | | - Hussain Al Ali
- Centre of Excellence for Genomics, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | | | | | - Saud Alarifi
- Department of Zoology, Science College, King Saud University, Riyadh, Saudi Arabia
| | - Abdullah A Alkahtane
- Department of Zoology, Science College, King Saud University, Riyadh, Saudi Arabia
| | - Salem Manohardas
- Department of Zoology, Science College, King Saud University, Riyadh, Saudi Arabia
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Manyilizu WB, Mdegela RH, Helleve A, Skjerve E, Kazwala R, Nonga H, Muller MHB, Lie E, Lyche J. Self-Reported Symptoms and Pesticide Use among Farm Workers in Arusha, Northern Tanzania: A Cross Sectional Study. TOXICS 2017; 5:toxics5040024. [PMID: 29051456 PMCID: PMC5750552 DOI: 10.3390/toxics5040024] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 09/18/2017] [Accepted: 09/20/2017] [Indexed: 11/16/2022]
Abstract
The objective of the study was to describe self-reported health symptoms, the use of personal protective gear and clothing and poor safety procedures when applying pesticides among farm workers. A total of 128 adult farm workers were interviewed using a structured questionnaire during the farming season. The commonly used pesticides included profenofos, mancozeb, chlorpyrifos, cypermethrin, deltamethrin, permethrin, lambda-cyhalothrin, endosulfan and carbosulfan. The majority (>90%) of farm workers used no personal protective clothing while handling pesticides. More than one-third of farm workers ate and drank without washing their hands following pesticide handling, while a smaller number smoked or chewed gum. Wearing special boots during pesticide application was found to reduce the risk of skin rash (OR = 0.2, 95% CI: 0.06-0.66), whereas smoking when applying pesticides increased the risk of chest pain occurrence (OR = 4.0, 95% CI: 1.14-15.43), as well as forgetfulness (OR = 4.0, 95% CI: 1.30-14.02). Chewing gum and eating when applying pesticides was associated with diarrhoea (OR = 11.0, 95% CI: 1.80-6.84 and OR = 7.0, 95% CI: 1.27-3.67 respectively). The increased self-reported prevalence of post-exposure adverse health effects among farm workers was associated with poor use of personal protective clothing and poor safety practices during pesticide use and handling. These data indicate the need for improved availability and use of protective equipment, and training in crop and pest management practices to prevent risky behavioursand for safer and sustainable vegetable production.
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Affiliation(s)
- Wilbert Bunini Manyilizu
- Health Systems Department, School of Public Administration and Management, Mzumbe University, P.O. Box 101, Morogoro 023, Tanzania.
- Departmentt of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro 023, Tanzania.
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, P.O. Box 8146, 454 Oslo, Norway.
| | - Robbinson Hammerton Mdegela
- Departmentt of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro 023, Tanzania.
| | - Arnfinn Helleve
- Institute of Health and Society, University of Oslo, International Community Health, P.O. Box 1130 Blindern, N-0318, 454 Oslo, Norway.
| | - Eystein Skjerve
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, P.O. Box 8146, 454 Oslo, Norway.
| | - Rudovick Kazwala
- Departmentt of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro 023, Tanzania.
| | - Hezron Nonga
- Departmentt of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro 023, Tanzania.
| | - Mette Hellen Bjorge Muller
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, P.O. Box 8146, 454 Oslo, Norway.
| | - Elisabeth Lie
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, P.O. Box 8146, 454 Oslo, Norway.
| | - Jan Lyche
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, P.O. Box 8146, 454 Oslo, Norway.
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Fukuyama T, Nishino R, Kosaka T, Watanabe Y, Kurosawa Y, Ueda H, Harada T. Effects of prior oral exposure to combinations of environmental immunosuppressive agents on ovalbumin allergen-induced allergic airway inflammation in Balb/c mice. Immunopharmacol Immunotoxicol 2014; 36:261-70. [PMID: 24935097 DOI: 10.3109/08923973.2014.926915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract Humans are exposed daily to multiple environmental chemicals in the atmosphere, in food, and in commercial products. Therefore, hazard identification and risk management must account for exposure to chemical mixtures. The objective of the study reported here was to investigate the effects of combinations of three well-known environmental immunotoxic chemicals - methoxychlor (MXC), an organochlorine compound; parathion (PARA), an organophosphate compound; and piperonyl butoxide (PBO), an agricultural insecticide synergist - by using a mouse model of ovalbumin (OVA)-induced allergic airway inflammation. Four-week-old Balb/c mice were exposed orally to either one or two of the environmental immunotoxic chemicals for five consecutive days, prior to intraperitoneal sensitization with OVA and an inhalation challenge. We assessed IgE levels in serum, B-cell counts, and cytokine production in hilar lymph nodes, and differential cell counts and levels of related chemokines in bronchoalveolar lavage fluid (BALF). Mice treated with MXC + PARA or PBO + MXC showed marked increases in serum IgE, IgE-positive B-cells and cytokines in lymph nodes, and differential cell counts and related chemokines in BALF compared with mice that received the vehicle control or the corresponding individual test substances. These results suggest that simultaneous exposure to multiple environmental chemicals aggravates allergic airway inflammation more than exposure to individual chemicals. It is expected that the results of this study will help others in their evaluation of immunotoxic combinational effects when conducting assessments of the safety of environmental/occupational chemicals.
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Affiliation(s)
- Tomoki Fukuyama
- Toxicology Division, Institute of Environmental Toxicology , Ibaraki , Japan
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10
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Hayashi K, Fukuyama T, Ohnuma A, Tajima Y, Kashimoto Y, Yoshida T, Kosaka T. Immunotoxicity of the organochlorine pesticide methoxychlor in female ICR, BALB/c, and C3H/He mice. J Immunotoxicol 2012; 10:119-24. [DOI: 10.3109/1547691x.2012.696743] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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11
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Fukuyama T, Kosaka T, Miyashita L, Nishino R, Wada K, Hayashi K, Ueda H, Harada T. Role of regulatory T cells in the induction of atopic dermatitis by immunosuppressive chemicals. Toxicol Lett 2012; 213:392-401. [DOI: 10.1016/j.toxlet.2012.07.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Revised: 07/18/2012] [Accepted: 07/19/2012] [Indexed: 01/07/2023]
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12
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Fukuyama T, Kosaka T, Hayashi K, Miyashita L, Tajima Y, Wada K, Nishino R, Ueda H, Harada T. Immunotoxicity in mice induced by short-term exposure to methoxychlor, parathion, or piperonyl butoxide. J Immunotoxicol 2012; 10:150-9. [DOI: 10.3109/1547691x.2012.703252] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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13
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Cheng HH, Lu YC, Lu T, Cheng JS, Mar GY, Fang YC, Chai KL, Jan CR. Effect of methoxychlor on Ca(2+) movement and viability in MDCK renal tubular cells. Basic Clin Pharmacol Toxicol 2012; 111:224-31. [PMID: 22458924 DOI: 10.1111/j.1742-7843.2012.00887.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 03/22/2012] [Indexed: 12/13/2022]
Abstract
The effect of the insecticide methoxychlor on the physiology of renal tubular cells is unknown. This study aimed to explore the effect of methoxychlor on cytosolic Ca(2+) concentrations ([Ca(2+) ](i) ) in MDCK renal tubular cells using the Ca(2+) -sensitive fluorescent dye fura-2. Methoxychlor at 5-20 μM increased [Ca(2+) ](i) in a concentration-dependent manner. The signal was reduced by 80% by removing extracellular Ca(2+) . Methoxychlor-induced Ca(2+) entry was not affected by nifedipine and SK&F96365 but was inhibited by econazole and protein kinase C modulators. In Ca(2+) -free medium, treatment with the endoplasmic reticulum Ca(2+) pump inhibitor thapsigargin or 2,5-di-tert-butylhydroquinone (BHQ) partly inhibited methoxychlor-induced [Ca(2+) ](i) rise. Incubation with methoxychlor also inhibited thapsigargin- or BHQ-induced [Ca(2+) ](i) rise. Inhibition of phospholipase C with U73122 nearly abolished methoxychlor-induced [Ca(2+) ](i) rise. At 5-15 μM, methoxychlor slightly increased cell viability, whereas at 20 μM, it decreased viability. The cytotoxic effect of methoxychlor was not reversed by chelating cytosolic Ca(2+) with 1,2-bis(2-aminophenoxy)ethane-N,N,N,N-tetraacetic acid/AM (BAPTA/AM). Annexin V-FITC data suggest that 10 μM methoxychlor inhibited apoptosis, while 20 μM methoxychlor enhanced apoptosis. Methoxychlor (10 and 20 μM) increased the production of reactive oxygen species. Together, in renal tubular cells, methoxychlor induced [Ca(2+) ](i) rise by inducing phospholipase C-dependent Ca(2+) release from multiple stores and Ca(2+) entry via protein kinase C- and econazole-sensitive channels. Methoxychlor slightly enhanced or inhibited cell viability in a concentration-dependent, Ca(2+) -independent manner. Methoxychlor induced cell death that may involve apoptosis via mitochondrial pathways.
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Affiliation(s)
- He-Hsiung Cheng
- Department of Medicine, Chang Bing Show Chwan Memorial Hospital, Changhua County, Taiwan
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Fukuyama T, Tajima Y, Hayashi K, Ueda H, Kosaka T. Prior or coinstantaneous oral exposure to environmental immunosuppressive agents aggravates mite allergen-induced atopic dermatitis-like immunoreaction in NC/Nga mice. Toxicology 2011; 289:132-40. [PMID: 21864637 DOI: 10.1016/j.tox.2011.08.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 08/04/2011] [Accepted: 08/06/2011] [Indexed: 11/24/2022]
Abstract
BACKGROUND Immunosuppressive environmental chemicals may increase the potency of allergens and thereby play a role in the development of allergic diseases such as allergic rhinitis, asthma and atopic dermatitis (AD). OBJECTIVES This study's primary objective was to examine the mechanisms behind the development of allergic diseases and immunosuppression induced by some environmental chemicals. We focused on the aggravation of AD by the organophosphorus pesticide O,O-diethyl-O-4-nitro-phenylthiophosphate (parathion) and the organochlorine pesticide 1,1,1-trichloro-2,2-bis(4-methoxyphenyl)ethane (methoxychlor), in NC/Nga mice sensitized with extract of Dermatophagoides farinae (Df). METHODS NC/Nga mice were exposed orally to parathion or methoxychlor prior or coinstantaneous with sensitization with Df. The mice were subsequently challenged with Df. One day after the last challenge with Df, we analyzed dermatitis severity and expression of genes in the ear auricle, immunoglobulin (Ig) E and IgG(2a) levels in serum, and in auricular lymph nodes, T- or B-cell numbers and cytokine production. RESULTS Prior exposure to parathion or methoxychlor induced marked increases in the following: dermatitis severity and gene expression in the ear auricle, IgE and IgG(2a) levels in serum, expression of surface antigens on helper T-cell and IgE-positive B-cell, production of Th1 and Th2 cytokines, and production of IgE in auricular lymph-node cells. In contrast, coinstantaneous exposure to parathion or methoxychlor yielded, at most, small but significant decreases in all parameters. CONCLUSIONS Our results indicate that atopic dermatitis can be aggravated by prior exposure to immunosuppressive environmental chemicals.
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Affiliation(s)
- T Fukuyama
- Institute of Environmental Toxicology, Ibaraki 303-0043, Japan.
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Prior exposure to organophosphorus and organochlorine pesticides increases the allergic potential of environmental chemical allergens in a local lymph node assay. Toxicol Lett 2010; 199:347-56. [DOI: 10.1016/j.toxlet.2010.09.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 09/23/2010] [Accepted: 09/24/2010] [Indexed: 12/20/2022]
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