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Liu L, Xu W, Li K, Hu Y, Shen L, Zhang H, Wang Y. Kv1.3 mediates ox-LDL-induced vascular smooth muscle cell proliferation through JAK2/STAT3 signaling pathway. Arch Biochem Biophys 2023; 746:109719. [PMID: 37591369 DOI: 10.1016/j.abb.2023.109719] [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: 05/26/2023] [Revised: 08/10/2023] [Accepted: 08/13/2023] [Indexed: 08/19/2023]
Abstract
Kv1.3 channel has been shown to participate in regulating inflammatory activation, proliferation and apoptosis in several cell types. However, most of those existing studies focused on the ion-conducting properties of Kv1.3 in maintaining the resting potential and regulating Ca2+ influx. The aim of our study was to explore whether the Kv1.3-JAK2/STAT3 signaling pathway was involved in oxidized low density lipoprotein (ox-LDL) induced vascular smooth muscle cell (VSMC) proliferation. VSMCs from mouse aorta were cultured and treated with ox-LDL (25 μg/mL). The cell counting kit-8 was used to assess cell proliferation, and western blotting was performed to detect expression levels of Kv1.3, JAK2/STAT3, phosphorylated JAK2/STAT3, cyclin B1 and cyclin D1 in treated VSMCs. VSMCs were transfected with Kv1.3 small interfering RNA (Kv1.3-siRNA) or infected with a Kv1.3 lentiviral expression vector (Lv-Kv1.3) and treated with a JAK2 inhibitor LY2784544 to assess the role of Kv1.3 and JAK2/STAT3 signaling in mediating VSMC proliferation induced by ox-LDL. Ox-LDL induced cell proliferation and upregulated the expression of Kv1.3 in mouse VSMCs. In VSMCs transfected with Kv1.3-siRNA, ox-LDL was not efficient in inducing cell proliferation or the levels of proliferation associated proteins, cyclin B1 and cyclin D1. However, cell proliferation, cyclin B1 and cyclin D1 levels increased in VSMCs infected with Lv-Kv1.3. Levels of phosphorylated JAK2 and STAT3 were increased in ox-LDL-treated VSMCs, and this increase was prevented in VSMCs transfected with Kv1.3-siRNA. Treatment with the JAK2 inhibitor LY2784544 also prevented the increase in VSMCs proliferation treated with ox-LDL. Our findings demonstrated that Kv1.3 promoted proliferation of VSMCs treated with ox-LDL, and that this effect might be mediated through activation of the JAK2/STAT3 signaling pathway.
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Affiliation(s)
- Lin Liu
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Wei Xu
- Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Kaiwen Li
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Yanyan Hu
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Lin Shen
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Hongyu Zhang
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China
| | - Yuanyuan Wang
- Department of Geriatric Medicine, Qilu Hospital of Shandong University, Ji'nan, 250012, China; Key Laboratory of Cardiovascular Proteomics of Shandong Province, Qilu Hospital of Shandong University, Ji'nan, 250012, China.
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Kodirov SA. Tale of tail current. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2019; 150:78-97. [PMID: 31238048 DOI: 10.1016/j.pbiomolbio.2019.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 05/22/2019] [Accepted: 06/20/2019] [Indexed: 02/07/2023]
Abstract
The largest biomass of channel proteins is located in unicellular organisms and bacteria that have no organs. However, orchestrated bidirectional ionic currents across the cell membrane via the channels are important for the functioning of organs of organisms, and equally concern both fauna or flora. Several ion channels are activated in the course of action potentials. One of the hallmarks of voltage-dependent channels is a 'tail current' - deactivation as observed after prior and sufficient activation predominantly at more depolarized potentials e.g. for Kv while upon hyperpolarization for HCN α subunits. Tail current also reflects the timing of channel closure that is initiated upon termination of stimuli. Finally, deactivation of currents during repolarization could be a selective estimate for given channel as in case of HERG, if dedicated long and more depolarized 'tail pulse' is used. Since from a holding potential of e.g. -70 mV are often a family of outward K+ currents comprising IA and IK are simultaneously activated in native cells.
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Affiliation(s)
- Sodikdjon A Kodirov
- Pavlov Institute of Physiology, Russian Academy of Sciences, Saint Petersburg, Russia; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA; Almazov Federal Heart, Blood and Endocrinology Centre, Saint Petersburg, 197341, Russia; Institute of Experimental Medicine, I. P. Pavlov Department of Physiology, Russian Academy of Medical Sciences, Saint Petersburg, Russia; Laboratory of Emotions' Neurobiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, 02-093, Poland.
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Abousaab A, Warsi J, Elvira B, Lang F. Caveolin-1 Sensitivity of Excitatory Amino Acid Transporters EAAT1, EAAT2, EAAT3, and EAAT4. J Membr Biol 2015; 249:239-49. [PMID: 26690923 DOI: 10.1007/s00232-015-9863-0] [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] [Received: 07/27/2015] [Accepted: 12/07/2015] [Indexed: 10/22/2022]
Abstract
Excitatory amino acid transporters EAAT1 (SLC1A3), EAAT2 (SLC1A2), EAAT3 (SLC1A1), and EAAT4 (SLC1A6) serve to clear L-glutamate from the synaptic cleft and are thus important for the limitation of neuronal excitation. EAAT3 has previously been shown to form complexes with caveolin-1, a major component of caveolae, which participate in the regulation of transport proteins. The present study explored the impact of caveolin-1 on electrogenic transport by excitatory amino acid transporter isoforms EAAT1-4. To this end cRNA encoding EAAT1, EAAT2, EAAT3, or EAAT4 was injected into Xenopus oocytes without or with additional injection of cRNA encoding caveolin-1. The L-glutamate (2 mM)-induced inward current (I Glu) was taken as a measure of glutamate transport. As a result, I Glu was observed in EAAT1-, EAAT2-, EAAT3-, or EAAT4-expressing oocytes but not in water-injected oocytes, and was significantly decreased by coexpression of caveolin-1. Caveolin-1 decreased significantly the maximal transport rate. Treatment of EAATs-expressing oocytes with brefeldin A (5 µM) was followed by a decrease in conductance, which was similar in oocytes expressing EAAT together with caveolin-1 as in oocytes expressing EAAT1-4 alone. Thus, caveolin-1 apparently does not accelerate transporter protein retrieval from the cell membrane. In conclusion, caveolin-1 is a powerful negative regulator of the excitatory glutamate transporters EAAT1, EAAT2, EAAT3, and EAAT4.
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Affiliation(s)
- Abeer Abousaab
- Department of Physiology I, University of Tübingen, Gmelinstr. 5, 72076, Tübingen, Germany
| | - Jamshed Warsi
- Department of Physiology I, University of Tübingen, Gmelinstr. 5, 72076, Tübingen, Germany
| | - Bernat Elvira
- Department of Physiology I, University of Tübingen, Gmelinstr. 5, 72076, Tübingen, Germany
| | - Florian Lang
- Department of Physiology I, University of Tübingen, Gmelinstr. 5, 72076, Tübingen, Germany.
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