1
|
Hossain Hrithik MT, Shahmohammadi N, Jin G, Lee DH, Singh N, Vik A, Hammock BD, Kim Y. Insect immune resolution with EpOME/DiHOME and its dysregulation by their analogs leading to pathogen hypersensitivity. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2024; 168:104104. [PMID: 38494144 PMCID: PMC11062637 DOI: 10.1016/j.ibmb.2024.104104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 02/16/2024] [Accepted: 03/08/2024] [Indexed: 03/19/2024]
Abstract
Upon immune challenge, recognition signals trigger insect immunity to remove the pathogens through cellular and humoral responses. Various immune mediators propagate the immune signals to nearby tissues, in which polyunsaturated fatty acid (PUFA) derivatives play crucial roles. However, little was known on how the insects terminate the activated immune responses after pathogen neutralization. Interestingly, C20 PUFA was detected at the early infection stage and later C18 PUFAs were induced in a lepidopteran insect, Spodoptera exigua. This study showed the role of epoxyoctadecamonoenoic acids (EpOMEs) in the immune resolution at the late infection stage to quench the excessive and unnecessary immune responses. In contrast, dihydroxy-octadecamonoenoates (DiHOMEs) were the hydrolyzed and inactive forms of EpOMEs. The hydrolysis is catalyzed by soluble epoxide hydrolase (sEH). Inhibitors specific to sEH mimicked the immunosuppression induced by EpOMEs. Furthermore, the inhibitor treatments significantly enhanced the bacterial virulence of Bacillus thuringiensis against S. exigua. This study proposes a negative control of the immune responses using EpOME/DiHOME in insects.
Collapse
Affiliation(s)
| | - Niayesh Shahmohammadi
- Department of Plant Medicals, Andong National University, Andong, 36729, South Korea
| | - Gahyeon Jin
- Department of Plant Medicals, Andong National University, Andong, 36729, South Korea
| | - Dong-Hee Lee
- Industry Academy Cooperation Foundation, Andong National University, Andong, 36729, South Korea
| | - Nalin Singh
- Department of Entomology and Nematology, University of California, Davis, CA, 95616, USA; UCD Comprehensive Cancer Center, University of California, Sacramento, CA, 95817, USA
| | - Anders Vik
- Department of Pharmacy, Section for Pharmaceutical Chemistry, University of Oslo, PO Box 1068 Blindern, N-0316, Oslo, Norway
| | - Bruce D Hammock
- Department of Entomology and Nematology, University of California, Davis, CA, 95616, USA; UCD Comprehensive Cancer Center, University of California, Sacramento, CA, 95817, USA
| | - Yonggyun Kim
- Department of Plant Medicals, Andong National University, Andong, 36729, South Korea.
| |
Collapse
|
2
|
Hrithrik TH, Lee DH, Singh N, Vik A, Hammock BD, Kim Y. Insect immune resolution with EpOME/DiHOME and its dysregulation by their analogs leading to pathogen hypersensitivity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.07.548078. [PMID: 37461499 PMCID: PMC10350063 DOI: 10.1101/2023.07.07.548078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Epoxyoctadecamonoenoic acids (EpOMEs) are epoxide derivatives of linoleic acid (9,12-octadecadienoic acid: LA). They are metabolized into dihydroxyoctadecamonoenoic acids (DiHOMEs) in mammals. Unlike in mammals where they act as adipokines or lipokines, EpOMEs act as immunosuppressants in insects. However, the functional link between EpOMEs and pro-immune mediators such as PGE2 is not known. In addition, the physiological significance of DiHOMEs is not clear in insects. This study analyzed the physiological role of these C18 oxylipins using a lepidopteran insect pest, Spodoptera exigua. Immune challenge of S. exigua rapidly upregulated the expression of the phospholipase A2 gene to trigger C20 oxylipin biosynthesis, followed by the upregulation of genes encoding EpOME synthase (SE51385) and a soluble epoxide hydrolase (Se-sEH). The sequential gene expression resulted in the upregulations of the corresponding gene products such as PGE2, EpOMEs, and DiHOMEs. Interestingly, only PGE2 injection without the immune challenge significantly upregulated the gene expression of SE51825 and Se-sEH. The elevated levels of EpOMEs acted as immunosuppressants by inhibiting cellular and humoral immune responses induced by the bacterial challenge, in which 12,13-EpOME was more potent than 9,10-EpOME. However, DiHOMEs did not inhibit the cellular immune responses but upregulated the expression of antimicrobial peptides selectively suppressed by EpOMEs. The negative regulation of insect immunity by EpOMEs and their inactive DiHOMEs were further validated by synthetic analogs of the linoleate epoxide and corresponding diol. Furthermore, inhibitors specific to Se-sEH used to prevent EpOME degradation significantly suppressed the immune responses. The data suggest a physiological role of C18 oxylipins in resolving insect immune response. Any immune dysregulation induced by EpOME analogs or sEH inhibitors significantly enhanced insect susceptibility to the entomopathogen, Bacillus thuringiensis.
Collapse
Affiliation(s)
| | - Dong-Hee Lee
- Industry Academy Cooperation Foundation, Andong National University, Andong 36729, Korea
| | - Nalin Singh
- Department of Entomology and Nematology, University of California, Davis, CA 95616, USA
- UCD Comprehensive Cancer Center, University of California, Sacramento, CA 95817, USA
| | - Anders Vik
- Department of Pharmacy, Section for Pharmaceutical Chemistry, University of Oslo, PO Box 1068 Blindern, N-0316 Oslo, Norway
| | - Bruce D Hammock
- Department of Entomology and Nematology, University of California, Davis, CA 95616, USA
- UCD Comprehensive Cancer Center, University of California, Sacramento, CA 95817, USA
| | - Yonggyun Kim
- Department of Plant Medicals, Andong National University, Andong 36729, Korea
| |
Collapse
|
3
|
Atone J, Wagner K, Koike S, Yang J, Hwang SH, Hammock BD. Inhibition of soluble epoxide hydrolase reduces paraquat neurotoxicity in rodents. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 98:104070. [PMID: 36682504 PMCID: PMC9992278 DOI: 10.1016/j.etap.2023.104070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 01/15/2023] [Accepted: 01/18/2023] [Indexed: 06/17/2023]
Abstract
Given the paucity of research surrounding the effect of chronic paraquat on striatal neurotoxicity, there is a need for further investigation into the neurotoxic effects of paraquat in mouse striatum. Furthermore, while previous studies have shown that inhibiting soluble epoxide hydrolase mitigates MPTP-mediated endoplasmic reticulum stress in mouse striatum, its effect on paraquat toxicity is still unknown. Thus, this study attempts to observe changes in inflammatory and endoplasmic reticulum stress markers in mouse striatum following chronic paraquat administration to determine whether inhibiting soluble epoxide hydrolase mitigates paraquat-induced neurotoxicity and whether it can reduce TLR4-mediated inflammation in primary astrocytes and microglia. Our results show that while the pro-inflammatory effect of chronic paraquat is small, there is a significant induction of inflammatory and cellular stress markers, such as COX2 and CHOP, that can be mitigated through a prophylactic administration of a soluble epoxide hydrolase inhibitor.
Collapse
Affiliation(s)
- Jogen Atone
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, USA
| | - Karen Wagner
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, USA
| | - Shinichiro Koike
- Department of Nutrition, University of California Davis, Davis, CA 95616, USA
| | - Jun Yang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, USA
| | - Sung Hee Hwang
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, USA
| | - Bruce D Hammock
- Department of Entomology and Nematology, and UC Davis Comprehensive Cancer Center, University of California Davis, Davis, CA 95616, USA.
| |
Collapse
|
4
|
Lee D, Hyuk Lee S, Lee H, Choi YK, Sung Kang K, Wook Lee J. Elucidation of protective effects of oxime derivatives against cisplatin-induced cytotoxicity in LLC-PK1 kidney cells. Bioorg Med Chem Lett 2023; 80:129114. [PMID: 36574854 DOI: 10.1016/j.bmcl.2022.129114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/27/2022] [Accepted: 12/20/2022] [Indexed: 12/25/2022]
Abstract
This study aimed to explore the renoprotective effects of oxime derivatives against cisplatin-mediated cell death in LLC-PK1 porcine kidney epithelial cells. Treatment with compounds 161-A and 161-F improved cisplatin-mediated LLC-PK1 cell damage and increased cell viability by more than 80% of the control value when compared with that of cisplatin-treated cells. In addition, 161-A and 161-F reduced cisplatin-induced apoptosis. Analysis of the molecular mechanisms underlying the effects exerted by these compounds revealed that treatment with 161-A and 161-B inhibited the protein expression of extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) and cleaved caspase-3 in cisplatin-treated LLC-PK1 cells. Thus, these findings provide in vitro scientific evidence that oxime derivatives may be useful as pharmacological candidates for the prevention of cisplatin-mediated nephrotoxicity.
Collapse
Affiliation(s)
- Dahae Lee
- College of Korean Medicine, Gachon University, Seongnam 13120, Republic of Korea
| | - Sang Hyuk Lee
- Natural Product Research Center, Korea Institute of Science and Technology, Saimdang-ro 679, Gangneung 25451, Republic of Korea
| | - Heesu Lee
- College of Dentistry, Gangneung Wonju National University, Gangneung 25457, Republic of Korea
| | - You-Kyung Choi
- College of Korean Medicine, Gachon University, Seongnam 13120, Republic of Korea
| | - Ki Sung Kang
- College of Korean Medicine, Gachon University, Seongnam 13120, Republic of Korea.
| | - Jae Wook Lee
- Natural Product Research Center, Korea Institute of Science and Technology, Saimdang-ro 679, Gangneung 25451, Republic of Korea.
| |
Collapse
|
5
|
Matsumoto N, Singh N, Lee KS, Barnych B, Morisseau C, Hammock BD. The epoxy fatty acid pathway enhances cAMP in mammalian cells through multiple mechanisms. Prostaglandins Other Lipid Mediat 2022; 162:106662. [PMID: 35779854 PMCID: PMC9530012 DOI: 10.1016/j.prostaglandins.2022.106662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 06/21/2022] [Accepted: 06/27/2022] [Indexed: 10/17/2022]
Abstract
The cellular mechanism by which epoxy fatty acids (EpFA) improves disease status is not well characterized. Previous studies suggest the involvement of cellular receptors and cyclic AMP (cAMP). Herein, the action of EpFAs derived from linoleic acid (LA), arachidonic acid (ARA), and docosahexaenoic acid on cAMP levels was studied in multiple cell types to elucidate relationships between EpFAs, receptors and cells' origin. cAMP levels were enhanced in HEK293 and LLC-PK1 cells by EpFAs from LA and ARA. Using selective antagonists, the EpFA effects on cAMP levels appear dependent on the prostaglandin E2 receptor 2 (EP2) but not 4 (EP4). Human coronary artery smooth muscle cells responded similarly to the EpFAs. However, we were not able to show the involvement of any of the receptors tested in this cell type. The results pinpointed distinct cell lines and receptor subtypes that natively respond to EpFA.
Collapse
Affiliation(s)
- Naoki Matsumoto
- Department of Entomology and Nematology, and Comprehensive Cancer Center, University of California, Davis CA, USA
| | - Nalin Singh
- Department of Entomology and Nematology, and Comprehensive Cancer Center, University of California, Davis CA, USA
| | - Kin Sing Lee
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing MI, USA
| | - Bogdan Barnych
- Department of Entomology and Nematology, and Comprehensive Cancer Center, University of California, Davis CA, USA
| | - Christophe Morisseau
- Department of Entomology and Nematology, and Comprehensive Cancer Center, University of California, Davis CA, USA
| | - Bruce D Hammock
- Department of Entomology and Nematology, and Comprehensive Cancer Center, University of California, Davis CA, USA.
| |
Collapse
|