title: The potential subunits involved in two subtypes of α-Bgt-resistant nAChRs in cockroach dorsal unpaired median (DUM) neurons.
abstract: The american cockroach (Periplaneta americana) dorsal unpaired median (DUM) neurons provide an native tool to analyze the functional and pharmacological properties of ion channels and membrane receptors, such as nicotine acetylcholine receptors (nAChRs). Here the imidacloprid-activated nAChR subtypes were examined in DUM neurons by the patch-clamp technique and the potential subunits involved in important subtypes were analyzed by combining with RNA interference (RNAi) technique. Imidacloprid exerted agonist activities on one subtype in α-Bgt-sensitive nAChRs and another subtype in α-Bgt-resistant nAChRs, in which the α-Bgt-resistant subtype showed much higher sensitivity to imidacloprid than the α-Bgt-sensitive subtype, with the difference close to 200-fold. In α-Bgt-resistant nAChRs, nicotine exerted the agonist activity on two subtypes (nAChR1 and nAChR2), although imidacloprid only activated nAChR1. RNAi against Paα3, Paα8 and Paβ1 significantly reduced both imidacloprid- and nicotine-activated currents on nAChR1. In contrast, RNAi against Paα1, Paα2 and Paβ1 decreased nicotine-activated currents on nAChR2. The results indicated that, in α-Bgt-resistant nAChRs, Paα3, Paα8 and Paβ1 might be involved in the subunit composition of nAChR1, and Paα1, Paα2 and Paβ1 in nAChR2. In summary, from the present study and previous reports, we deduced that there are at least three nAChR subtypes that are sensitive to imidacloprid in the cockroach DUM neurons.
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China.
authors.forename: Huahua
authors.initials: H
authors.lastname: Sun
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China; Changzhou Entry-Exit Inspection and Quarantine Bureau, Longjin Road 1268, Changzhou 213022, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China.
authors.forename: Xinzhu
authors.initials: X
authors.lastname: Cang
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Bao
authors.affiliation: Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China. Electronic address: liuzewen@njau.edu.cn.
authors.forename: Zewen
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000818:Animals; D002038:Bungarotoxins; D003001:Cloning, Molecular; D007093:Imidazoles; D008297:Male; D000073943:Neonicotinoids; D009474:Neurons / Q000378:metabolism; D009574:Nitro Compounds; D018408:Patch-Clamp Techniques; D010526:Periplaneta / Q000378:metabolism*; D021122:Protein Subunits; D034622:RNA Interference; D011978:Receptors, Nicotinic / Q000378:metabolism*
chemical_list: D002038:Bungarotoxins; D007093:Imidazoles; D000073943:Neonicotinoids; D009574:Nitro Compounds; D021122:Protein Subunits; D011978:Receptors, Nicotinic; C082359:imidacloprid
keywords: Dorsal unpaired median (DUM) neuron; Nicotinic acetylcholine receptor; Periplaneta americana; Subunit composition