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Sourisseau F, Chahine C, Pouliot V, Cens T, Charnet P, Chahine M. Cloning, functional expression, and pharmacological characterization of inwardly rectifying potassium channels (Kir) from Apis mellifera. Sci Rep 2024; 14:7834. [PMID: 38570597 PMCID: PMC10991380 DOI: 10.1038/s41598-024-58234-0] [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: 12/01/2023] [Accepted: 03/26/2024] [Indexed: 04/05/2024] Open
Abstract
Potassium channels belong to the super family of ion channels and play a fundamental role in cell excitability. Kir channels are potassium channels with an inwardly rectifying property. They play a role in setting the resting membrane potential of many excitable cells including neurons. Although putative Kir channel family genes can be found in the Apis mellifera genome, their functional expression, biophysical properties, and sensitivity to small molecules with insecticidal activity remain to be investigated. We cloned six Kir channel isoforms from Apis mellifera that derive from two Kir genes, AmKir1 and AmKir2, which are present in the Apis mellifera genome. We studied the tissue distribution, the electrophysiological and pharmacological characteristics of three isoforms that expressed functional currents (AmKir1.1, AmKir2.2, and AmKir2.3). AmKir1.1, AmKir2.2, and AmKir2.3 isoforms exhibited distinct characteristics when expressed in Xenopus oocytes. AmKir1.1 exhibited the largest potassium currents and was impermeable to cesium whereas AmKir2.2 and AmKir2.3 exhibited smaller currents but allowed cesium to permeate. AmKir1 exhibited faster opening kinetics than AmKir2. Pharmacological experiments revealed that both AmKir1.1 and AmKir2.2 are blocked by the divalent ion barium, with IC50 values of 10-5 and 10-6 M, respectively. The concentrations of VU041, a small molecule with insecticidal properties required to achieve a 50% current blockade for all three channels were higher than those needed to block Kir channels in other arthropods, such as the aphid Aphis gossypii and the mosquito Aedes aegypti. From this, we conclude that Apis mellifera AmKir channels exhibit lower sensitivity to VU041.
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Affiliation(s)
- Fabien Sourisseau
- CERVO Brain Research Centre, 2601, chemin de la Canardière, Quebec City, QC, G1J 2G3, Canada
| | - Chaimaa Chahine
- CERVO Brain Research Centre, 2601, chemin de la Canardière, Quebec City, QC, G1J 2G3, Canada
| | - Valérie Pouliot
- CERVO Brain Research Centre, 2601, chemin de la Canardière, Quebec City, QC, G1J 2G3, Canada
| | - Thierry Cens
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR 5247, 1919 Route de Mende, Montpellier, France
| | - Pierre Charnet
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR 5247, 1919 Route de Mende, Montpellier, France
| | - Mohamed Chahine
- CERVO Brain Research Centre, 2601, chemin de la Canardière, Quebec City, QC, G1J 2G3, Canada.
- Department of Medicine, Faculty of Medicine, Université Laval, Quebec City, QC, Canada.
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Piermarini PM, Denton JS, Swale DR. The Molecular Physiology and Toxicology of Inward Rectifier Potassium Channels in Insects. ANNUAL REVIEW OF ENTOMOLOGY 2022; 67:125-142. [PMID: 34606365 DOI: 10.1146/annurev-ento-062121-063338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Inward rectifier K+ (Kir) channels have been studied extensively in mammals, where they play critical roles in health and disease. In insects, Kir channels have recently been found to be key regulators of diverse physiological processes in several tissues. The importance of Kir channels in insects has positioned them to serve as emerging targets for the development of insecticides with novel modes of action. In this article, we provide the first comprehensive review of insect Kir channels, highlighting the rapid progress made in understanding their molecular biology, physiological roles, pharmacology, and toxicology. In addition, we highlight key gaps in our knowledge and suggest directions for future research to advance our understanding of Kir channels and their roles in insect physiology. Further knowledge of their functional roles will also facilitate their exploitation as targets for controlling arthropod pests and vectors of economic, medical, and/or veterinary relevance.
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Affiliation(s)
- Peter M Piermarini
- Department of Entomology, The Ohio State University, Wooster, Ohio 44691, USA;
| | - Jerod S Denton
- Departments of Anesthesiology & Pharmacology, Vanderbilt University Medical Center, Nashville, Tennessee 37235, USA;
| | - Daniel R Swale
- Department of Entomology, Louisiana State University AgCenter, Baton Rouge, Louisiana 70803, USA;
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Gallichotte EN, Dobos KM, Ebel GD, Hagedorn M, Rasgon JL, Richardson JH, Stedman TT, Barfield JP. Towards a method for cryopreservation of mosquito vectors of human pathogens. Cryobiology 2021; 99:1-10. [PMID: 33556359 DOI: 10.1016/j.cryobiol.2021.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/23/2021] [Accepted: 02/01/2021] [Indexed: 12/13/2022]
Abstract
Mosquito-borne diseases are responsible for millions of human deaths every year, posing a massive burden on global public health. Mosquitoes transmit a variety of bacteria, parasites and viruses. Mosquito control efforts such as insecticide spraying can reduce mosquito populations, but they must be sustained in order to have long term impacts, can result in the evolution of insecticide resistance, are costly, and can have adverse human and environmental effects. Technological advances have allowed genetic manipulation of mosquitoes, including generation of those that are still susceptible to insecticides, which has greatly increased the number of mosquito strains and lines available to the scientific research community. This generates an associated challenge, because rearing and maintaining unique mosquito lines requires time, money and facilities, and long-term maintenance can lead to adaptation to specific laboratory conditions, resulting in mosquito lines that are distinct from their wild-type counterparts. Additionally, continuous rearing of transgenic lines can lead to loss of genetic markers, genes and/or phenotypes. Cryopreservation of valuable mosquito lines could help circumvent these limitations and allow researchers to reduce the cost of rearing multiple lines simultaneously, maintain low passage number transgenic mosquitoes, and bank lines not currently being used. Additionally, mosquito cryopreservation could allow researchers to access the same mosquito lines, limiting the impact of unique laboratory or field conditions. Successful cryopreservation of mosquitoes would expand the field of mosquito research and could ultimately lead to advances that would reduce the burden of mosquito-borne diseases, possibly through rear-and-release strategies to overcome mosquito insecticide resistance. Cryopreservation techniques have been developed for some insect groups, including but not limited to fruit flies, silkworms and other moth species, and honeybees. Recent advances within the cryopreservation field, along with success with other insects suggest that cryopreservation of mosquitoes may be a feasible method for preserving valuable scientific and public health resources. In this review, we will provide an overview of basic mosquito biology, the current state of and advances within insect cryopreservation, and a proposed approach toward cryopreservation of Anopheles stephensi mosquitoes.
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Affiliation(s)
- Emily N Gallichotte
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
| | - Karen M Dobos
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
| | - Gregory D Ebel
- Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
| | - Mary Hagedorn
- Smithsonian Conservation Biology Institute, Smithsonian Institution, Front Royal, VA, USA; Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, HI, USA
| | - Jason L Rasgon
- Department of Entomology, The Pennsylvania State University, University Park, PA, USA; Center for Infectious Disease Dynamics, The Pennsylvania State University, University Park, PA, USA; Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
| | | | | | - Jennifer P Barfield
- Department of Biomedical Sciences, Animal Reproduction and Biotechnology Laboratory, Colorado State University, Fort Collins, CO, USA.
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Aretz CD, Morwitzer MJ, Sanford AG, Hogan AM, Portillo MV, Kharade SV, Kramer M, McCarthey JB, Trigueros RR, Piermarini PM, Denton JS, Hopkins CR. Discovery and Characterization of 2-Nitro-5-(4-(phenylsulfonyl)piperazin-1-yl)- N-(pyridin-4-ylmethyl)anilines as Novel Inhibitors of the Aedes aegypti Kir1 ( AeKir1) Channel. ACS Infect Dis 2019; 5:917-931. [PMID: 30832472 DOI: 10.1021/acsinfecdis.8b00368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mosquito-borne arboviral diseases such as Zika, dengue fever, and chikungunya are transmitted to humans by infected adult female Aedes aegypti mosquitoes and affect a large portion of the world's population. The Kir1 channel in Ae. aegypti ( AeKir1) is an important ion channel in the functioning of mosquito Malpighian (renal) tubules and one that can be manipulated in order to disrupt excretory functions in mosquitoes. We have previously reported the discovery of various scaffolds that are active against the AeKir1 channel. Herein we report the synthesis and biological characterization of a new 2-nitro-5-(4-(phenylsulfonyl) piperazin-1-yl)- N-(pyridin-4-ylmethyl)anilines scaffold as inhibitors of AeKir1. This new scaffold is more potent in vitro compared to the previously reported scaffolds, and the molecules kill mosquito larvae.
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Affiliation(s)
| | | | | | | | | | - Sujay V. Kharade
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
| | - Meghan Kramer
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
| | - James B. McCarthey
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
| | | | - Peter M. Piermarini
- Department of Entomology, Ohio State University, Wooster, Ohio 44691, United States
| | - Jerod S. Denton
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
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