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Combined drug triads for synergic neuroprotection in retinal degeneration. Biomed Pharmacother 2022; 149:112911. [DOI: 10.1016/j.biopha.2022.112911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 11/23/2022] Open
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Chronic resveratrol consumption prevents hypertension development altering electrophysiological currents and Ca 2+ signaling in chromaffin cells from SHR rats. Cell Signal 2020; 76:109811. [PMID: 33075487 DOI: 10.1016/j.cellsig.2020.109811] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 12/31/2022]
Abstract
Resveratrol (RESV) is one of the most abundant polyphenol-stilbene compounds found in red wine with well-established cardioprotective and antihypertensive effects. Hyperactivity of the sympathoadrenal axis seems to be one of the major contributing factors in the pathogenesis of human essential hypertension. Alterations in outward voltage-dependent potassium currents (IK) and inward voltage-dependent sodium (INa), calcium (ICa) and nicotinic (IACh) currents, CCs excitability, Ca2+ homeostasis, and catecholamine exocytosis were previously related to the hypertensive state. This raised the issue of whether in vivo long-term RESV treatment can directly act as a modulator of Ca2+ influx or a regulator of ion channel permeability in CCs. We monitored outward and inward currents, and cytosolic Ca2+ concentrations ([Ca2+]c) using different pharmacological approaches in CCs from normotensive (WKY) and hypertensive (SHR) animals chronically exposed to trans-RESV (50 mg/L/v.o, 28 days). The long-term RESV treatment prevented the increase of the systolic blood pressure (SBP) in SHR, without reversion of cardiac hypertrophy. We also found an increase of the outward IK, reduction in inward INa,ICa, and IACh, and the mitigation of [Ca2+]c overload in CCs from SHR at the end of RESV treatment. Our data revealed that electrophysiological alterations of the CCs and in its Ca2+ homeostasis are potential new targets related to the antihypertensive effects of long-term RESV treatment.
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Girek M, Kłosiński K, Grobelski B, Pizzimenti S, Cucci MA, Daga M, Barrera G, Pasieka Z, Czarnecka K, Szymański P. Novel tetrahydroacridine derivatives with iodobenzoic moieties induce G0/G1 cell cycle arrest and apoptosis in A549 non-small lung cancer and HT-29 colorectal cancer cells. Mol Cell Biochem 2019; 460:123-150. [PMID: 31313023 PMCID: PMC6745035 DOI: 10.1007/s11010-019-03576-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 06/21/2019] [Indexed: 12/24/2022]
Abstract
A series of nine tetrahydroacridine derivatives with iodobenzoic moiety were synthesized and evaluated for their cytotoxic activity against cancer cell lines—A549 (human lung adenocarcinoma), HT-29 (human colorectal adenocarcinoma) and somatic cell line—EA.hy926 (human umbilical vein cell line). All compounds displayed high cytotoxicity activity against A549 (IC50 59.12–14.87 µM) and HT-29 (IC50 17.32–5.90 µM) cell lines, higher than control agents—etoposide and 5-fluorouracil. Structure–activity relationship showed that the position of iodine in the substituent in the para position and longer linker most strongly enhanced the cytotoxic effect. Among derivatives, 1i turned out to be the most cytotoxic and displayed IC50 values of 14.87 µM against A549 and 5.90 µM against HT-29 cell lines. In hyaluronidase inhibition assay, all compounds presented anti-inflammatory activity, however, slightly lower than reference compound. ADMET prediction showed that almost all compounds had good pharmacokinetic profiles. 1b, 1c and 1f compounds turned out to act against chemoresistance in cisplatin-resistant 253J B-V cells. Compounds intercalated into DNA and inhibited cell cycle in G0/G1 phase—the strongest inhibition was observed for 1i in A549 and 1c in HT-29. Among compounds, the highest apoptotic effect in both cell lines was observed after treatment with 1i. Compounds caused DNA damage and H2AX phosphorylation, which was detected in A549 and HT-29 cells. All research confirmed anticancer properties of novel tetrahydroacridine derivatives and explained a few pathways of their mechanism of cytotoxic action.
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Affiliation(s)
- Małgorzata Girek
- Department of Pharmaceutical Chemistry, Drug Analyses and Radiopharmacy, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151, Lodz, Poland
| | - Karol Kłosiński
- Department of Experimental Surgery, Faculty of Medicine, Medical University of Lodz, Pabianicka 62, 93-513, Lodz, Poland
| | - Bartłomiej Grobelski
- Animal House, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151, Lodz, Poland
| | - Stefania Pizzimenti
- Department of Clinical and Biological Sciences, School of Medicine, University of Turin, Corso Raffaello 30, 10125, Turin, Italy
| | - Marie Angele Cucci
- Department of Clinical and Biological Sciences, School of Medicine, University of Turin, Corso Raffaello 30, 10125, Turin, Italy
| | - Martina Daga
- Department of Clinical and Biological Sciences, School of Medicine, University of Turin, Corso Raffaello 30, 10125, Turin, Italy
| | - Giuseppina Barrera
- Department of Clinical and Biological Sciences, School of Medicine, University of Turin, Corso Raffaello 30, 10125, Turin, Italy
| | - Zbigniew Pasieka
- Department of Experimental Surgery, Faculty of Medicine, Medical University of Lodz, Pabianicka 62, 93-513, Lodz, Poland
| | - Kamila Czarnecka
- Department of Pharmaceutical Chemistry, Drug Analyses and Radiopharmacy, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151, Lodz, Poland
| | - Paweł Szymański
- Department of Pharmaceutical Chemistry, Drug Analyses and Radiopharmacy, Faculty of Pharmacy, Medical University of Lodz, Muszynskiego 1, 90-151, Lodz, Poland.
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García-Alvarado F, Govoni G, de Pascual R, Ruiz-Ruiz C, Muñoz-Montero A, Gandía L, de Diego AMG, García AG. Otilonium and pinaverium trigger mitochondrial-mediated apoptosis in rat embryo cortical neurons in vitro. Neurotoxicology 2018; 70:99-111. [PMID: 30448301 DOI: 10.1016/j.neuro.2018.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 11/06/2018] [Accepted: 11/06/2018] [Indexed: 11/17/2022]
Abstract
In the frame of a repositioning programme with cholinergic medicines in clinical use searching for neuroprotective properties, we surprisingly found that spasmolytic antimuscarinics otilonium and pinaverium exhibited neurotoxic effects in neuronal cultures. We decided to characterize such unexpected action in primary cultures of rat embryo cortical neurons. Neurotoxicity was time- and concentration-dependent, exhibiting approximate EC50 values of 5 μM for both drugs. Seven antimuscarinic drugs endowed with a quaternary ammonium, and another 10 drugs with different cholinergic activities, carrying in their molecule a ternary ammonium did not exhibit neurotoxicity. Both drugs caused a concentration-dependent blockade of whole-cell inward currents through voltage-activated calcium channels (VACCs). Consistent with this, they also blocked the K+-elicited [Ca2+]c transients. Neither antioxidant catalase, glutathione, n-acetylcysteine, nor melatonin protected against neurotoxicity of otilonium or pinaverium. However cyclosporine A, a blocker of the mitochondrial permeability transition pore, prevented the neurotoxic effects of otilonium and pinaverium monitored as the fraction of cells undergoing apoptosis. Furthermore, the caspase-9 and caspase-3 inhibitor Ac-LEHD-CHO mitigated the apoptotic neuronal death of both drugs by around 50%. Data are compatible with the hypothesis that otilonium and pinaverium elicit neuronal death by activating the intrinsic mitochondrial-mediated signaling pathway of apoptosis. This may have its origin in the mitigation of Ca2+ entry and the uncoupling of the Ca2+-dependent generation of mitochondrial bioenergetics, thus causing the opening of the mitochondrial mPTP to elicit apoptotic neuronal death.
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Affiliation(s)
- Fernanda García-Alvarado
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa, Diego de León, 62, 28006, Madrid, Spain.
| | - Giulia Govoni
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain.
| | - Ricardo de Pascual
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain.
| | - Cristina Ruiz-Ruiz
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain.
| | - Alicia Muñoz-Montero
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain.
| | - Luis Gandía
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain.
| | - Antonio M G de Diego
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; DNS Neuroscience, Parque Científico de Madrid, Faraday, 7, Campus de Cantoblanco. 28049, Madrid, Spain
| | - Antonio G García
- Instituto Teófilo Hernando, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029, Madrid, Spain; Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa, Diego de León, 62, 28006, Madrid, Spain; DNS Neuroscience, Parque Científico de Madrid, Faraday, 7, Campus de Cantoblanco. 28049, Madrid, Spain.
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5
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de Diego AMG, García AG. Altered exocytosis in chromaffin cells from mouse models of neurodegenerative diseases. Acta Physiol (Oxf) 2018; 224:e13090. [PMID: 29742321 DOI: 10.1111/apha.13090] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 04/19/2018] [Accepted: 04/25/2018] [Indexed: 12/26/2022]
Abstract
Chromaffin cells from the adrenal gland (CCs) have extensively been used to explore the molecular structure and function of the exocytotic machinery, neurotransmitter release and synaptic transmission. The CC is integrated in the sympathoadrenal axis that helps the body maintain homoeostasis during both routine life and in acute stress conditions. This function is exquisitely controlled by the cerebral cortex and the hypothalamus. We propose the hypothesis that damage undergone by the brain during neurodegenerative diseases is also affecting the neurosecretory function of adrenal medullary CCs. In this context, we review here the following themes: (i) How the discharge of catecholamines is centrally and peripherally regulated at the sympathoadrenal axis; (ii) which are the intricacies of the amperometric techniques used to study the quantal release of single-vesicle exocytotic events; (iii) which are the alterations of the exocytotic fusion pore so far reported, in CCs of mouse models of neurodegenerative diseases; (iv) how some proteins linked to neurodegenerative pathologies affect the kinetics of exocytotic events; (v) finally, we try to integrate available data into a hypothesis to explain how the centrally originated neurodegenerative diseases may alter the kinetics of single-vesicle exocytotic events in peripheral adrenal medullary CCs.
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Affiliation(s)
- A. M. García de Diego
- Instituto Teófilo Hernando; Universidad Autónoma de Madrid; Madrid Spain
- Instituto de Investigación Sanitaria; Hospital Universitario de la Princesa; Universidad Autónoma de Madrid; Madrid Spain
- DNS Neuroscience; Parque Científico de Madrid; Madrid Spain
| | - A. García García
- Instituto Teófilo Hernando; Universidad Autónoma de Madrid; Madrid Spain
- Instituto de Investigación Sanitaria; Hospital Universitario de la Princesa; Universidad Autónoma de Madrid; Madrid Spain
- DNS Neuroscience; Parque Científico de Madrid; Madrid Spain
- Departamento de Farmacología y Terapéutica; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
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6
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Nanclares C, Gameiro-Ros I, Méndez-López I, Martínez-Ramírez C, Padín-Nogueira JF, Colmena I, Baraibar AM, Gandía L, García AG. Dual Antidepressant Duloxetine Blocks Nicotinic Receptor Currents, Calcium Signals and Exocytosis in Chromaffin Cells Stimulated with Acetylcholine. J Pharmacol Exp Ther 2018; 367:28-39. [PMID: 30006476 DOI: 10.1124/jpet.118.250969] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 07/12/2018] [Indexed: 01/09/2023] Open
Abstract
The inhibition of nicotinic acetylcholine receptors (nAChRs) has been proposed as a potential strategy to develop new antidepressant drugs. This is based on the observation that antidepressants that selectively block noradrenaline (NA) or serotonin (5-HT) reuptake also inhibit nAChRs. Dual antidepressants blocking both NA and 5-HT reuptake were proposed to shorten the delay in exerting their clinical effects; whether duloxetine, a prototype of dual antidepressants, also blocks nAChRs is unknown. Here we explored this question in bovine chromaffin cells (BCCs) that express native α3, α5, and α7 nAChRs and in cell lines expressing human α7, α3β4, or α4β2 nAChRs. We have found that duloxetine fully blocked the acetylcholine (ACh)-elicited nicotinic currents in BCCs with an IC50 of 0.86 µM. Such blockade seemed to be noncompetitive, voltage dependent, and partially use dependent. The ACh-elicited membrane depolarization, the elevation of cytosolic calcium ([Ca2+]c), and catecholamine release in BCCs were also blocked by duloxetine. This blockade developed slowly, and the recovery of secretion was also slow and gradual. Duloxetine did not affect Na+ or Ca2+ channel currents neither the high-K+-elicited [Ca2+]c transients and secretion. Of interest was that in cell lines expressing human α7, α3β4, and α4β2 nAChRs, duloxetine blocked nicotinic currents with IC50 values of 0.1, 0.56, and 0.85 µM, respectively. Thus, in blocking α7 receptors, which are abundantly expressed in the brain, duloxetine exhibited approximately 10-fold to 100- fold higher potency with respect to reported IC50 values for various antidepressant drugs. This may contribute to the antidepressant effect of duloxetine.
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Affiliation(s)
- Carmen Nanclares
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Isabel Gameiro-Ros
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Iago Méndez-López
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Carmen Martínez-Ramírez
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - J Fernando Padín-Nogueira
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Inés Colmena
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Andrés M Baraibar
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Luis Gandía
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
| | - Antonio G García
- Instituto Teófilo Hernando and Departamento de Farmacología, Facultad de Medicina (C.N., I.G.-R., I.M.-L., C.M.-R., J.F.P.-N., I.C., A.M.B., L.G., A.G.G.) and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa (A.G.G.), Universidad Autónoma de Madrid, Madrid, Spain; and Departamento de Ciencias Médicas, Facultad de Medicina, Universidad Castilla La Mancha (UCLM), Ciudad Real, Spain (J.F.P.-N.)
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Baraibar AM, de Pascual R, Camacho M, Domínguez N, David Machado J, Gandía L, Borges R. Distinct patterns of exocytosis elicited by Ca 2+, Sr 2+ and Ba 2+ in bovine chromaffin cells. Pflugers Arch 2018; 470:1459-1471. [PMID: 29926228 DOI: 10.1007/s00424-018-2166-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/24/2018] [Accepted: 06/07/2018] [Indexed: 10/28/2022]
Abstract
Three divalent cations can elicit secretory responses in most neuroendocrine cells, including chromaffin cells. The extent to which secretion is elicited by the cations in intact depolarized cells was Ba2+ > Sr2+ ≥ Ca2+, contrasting with that elicited by these cations in permeabilized cells (Ca2+ > Sr2+ > Ba2+). Current-clamp recordings show that extracellular Sr2+ and Ba2+ cause membrane depolarization and action potentials, which are not blocked by Cd2+ but that can be mimicked by tetra-ethyl-ammonium. When applied intracellularly, only Ba2+ provokes action potentials. Voltage-clamp monitoring of Ca2+-activated K+ channels (KCa) shows that Ba2+ reduces outward currents, which were enhanced by Sr2+. Extracellular Ba2+ increases cytosolic Ca2+ concentrations in Fura-2-loaded intact cells, and it induces long-lasting catecholamine release. Conversely, amperometric recordings of permeabilized cells show that Ca2+ promotes the longest lasting secretion, as Ba2+ only provokes secretion while it is present and Sr2+ induces intermediate-lasting secretion. Intracellular Ba2+ dialysis provokes exocytosis at concentrations 100-fold higher than those of Ca2+, whereas Sr2+ exhibits an intermediate sensitivity. These results are compatible with the following sequence of events: Ba2+ blocks KCa channels from both the outside and inside of the cell, causing membrane depolarization that, in turn, opens voltage-sensitive Ca2+ channels and favors the entry of Ca2+ and Ba2+. Although Ca2+ is less permeable through its own channels, it is more efficient in triggering exocytosis. Strontium possesses both an intermediate permeability and an intermediate ability to induce secretion.
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Affiliation(s)
- Andrés M Baraibar
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029, Madrid, Spain
| | - Ricardo de Pascual
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029, Madrid, Spain
| | - Marcial Camacho
- Unidad de Farmacología, Facultad de Medicina, Universidad de La Laguna, 38200, La Laguna, Tenerife, Spain.,Institute of Neurophysiology, Charité-Universitätsmedizin Berlin, 10117, Berlin, Germany
| | - Natalia Domínguez
- Unidad de Farmacología, Facultad de Medicina, Universidad de La Laguna, 38200, La Laguna, Tenerife, Spain.,INTEGRARE, Généthon, Inserm, Univ Evry, Université Paris-Saclay, 91002, Evry, France
| | - J David Machado
- Unidad de Farmacología, Facultad de Medicina, Universidad de La Laguna, 38200, La Laguna, Tenerife, Spain
| | - Luis Gandía
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029, Madrid, Spain
| | - Ricardo Borges
- Unidad de Farmacología, Facultad de Medicina, Universidad de La Laguna, 38200, La Laguna, Tenerife, Spain. .,Instituto Universitario de BioOrgánica Antonio González, Universidad de La Laguna, 38200, La Laguna, Tenerife, Spain.
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8
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de Los Rios C, Cano-Abad MF, Villarroya M, López MG. Chromaffin cells as a model to evaluate mechanisms of cell death and neuroprotective compounds. Pflugers Arch 2017; 470:187-198. [PMID: 28823085 DOI: 10.1007/s00424-017-2044-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 07/19/2017] [Accepted: 07/20/2017] [Indexed: 11/29/2022]
Abstract
In this review, we show how chromaffin cells have contributed to evaluate neuroprotective compounds with diverse mechanisms of action. Chromaffin cells are considered paraneurons, as they share many common features with neurons: (i) they synthesize, store, and release neurotransmitters upon stimulation and (ii) they express voltage-dependent calcium, sodium, and potassium channels, in addition to a wide variety of receptors. All these characteristics, together with the fact that primary cultures from bovine adrenal glands or chromaffin cells from the tumor pheochromocytoma cell line PC12 are easy to culture, make them an ideal model to study neurotoxic mechanisms and neuroprotective drugs. In the first part of this review, we will analyze the different cytotoxicity models related to calcium dyshomeostasis and neurodegenerative disorders like Alzheimer's or Parkinson's. Along the second part of the review, we describe how different classes of drugs have been evaluated in chromaffin cells to determine their neuroprotective profile in different neurodegenerative-related models.
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Affiliation(s)
- Cristobal de Los Rios
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain
| | - Maria F Cano-Abad
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain
| | | | - Manuela G López
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain. .,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain. .,Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain.
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9
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Electrophysiological properties and augmented catecholamine release from chromaffin cells of WKY and SHR rats contributing to the hypertension development elicited by chronic EtOH consumption. Eur J Pharmacol 2017; 803:65-77. [DOI: 10.1016/j.ejphar.2017.03.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 03/07/2017] [Accepted: 03/13/2017] [Indexed: 12/12/2022]
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10
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López-Gil A, Nanclares C, Méndez-López I, Martínez-Ramírez C, de Los Rios C, Padín-Nogueira JF, Montero M, Gandía L, García AG. The quantal catecholamine release from mouse chromaffin cells challenged with repeated ACh pulses is regulated by the mitochondrial Na + /Ca 2+ exchanger. J Physiol 2017; 595:2129-2146. [PMID: 27982456 DOI: 10.1113/jp273339] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 11/30/2016] [Indexed: 01/09/2023] Open
Abstract
KEY POINTS Upon repeated application of short ACh pulses to C57BL6J mouse chromaffin cells, the amperometrically monitored secretory responses promptly decayed to a steady-state level of around 25% of the initial response. A subsequent K+ pulse, however, overcame such decay. These data suggest that mouse chromaffin cells have a ready release-vesicle pool that is selectively recruited by the physiological neurotransmitter ACh. The ACh-sensitive vesicle pool is refilled and maintained by the rate of Ca2+ delivery from mitochondria to the cytosol, through the mitochondrial Na+ /Ca2+ exchanger (mNCX). ITH12662, a novel blocker of the mNCX, prevented the decay of secretion elicited by ACh pulses and delayed the rate of [Ca2+ ]c clearance. This regulatory pathway may be physiologically relevant in situations of prolonged stressful conflicts where a sustained catecholamine release is regulated by mitochondrial Ca2+ circulation through the mNCX, which couples respiration and ATP synthesis to long-term stimulation of chromaffin cells by endogenously released ACh. ABSTRACT Using caged-Ca2+ photorelease or paired depolarising pulses in voltage-clamped chromaffin cells (CCs), various pools of secretory vesicles with different readiness to undergo exocytosis have been identified. Whether these pools are present in unclamped CCs challenged with ACh, the physiological neurotransmitter at the splanchnic nerve-CC synapse, is unknown. We have explored here whether an ACh-sensitive ready-release vesicle pool (ASP) is present in C57BL6J mouse chromaffin cells (MCCs). Single cells were fast perfused with a Tyrode solution at 37°C, and challenged with 12 sequential ACh pulses (100 μm, 2 s, every 30 s) plus a K+ pulse given at the end (75 mm K+ ). After the first 2-3 ACh pulses the amperometrically monitored secretory responses promptly decayed to a steady-state level of around 25% of the initial response. The last K+ pulse, however, overcame such decay. Repeated ACh pulses to voltage-clamped cells elicited non-desensitising nicotinic currents. Also, the [Ca2+ ]c transients elicited by repeated ACh pulses that were superimposed on a stable baseline elevation did not undergo decay. The novel blocker of the mitochondrial Na+ /Ca2+ exchanger (mNCX) ITH12662 prevented the decay of secretion elicited by ACh pulses and delayed the rate of [Ca2+ ]c clearance. The experiments are compatible with the idea that C57BL6J MCCs have an ASP vesicle pool that is selectively recruited by the physiological neurotransmitter ACh and is regulated by the rate of Ca2+ delivery from mitochondria to the cytosol, through the mNCX.
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Affiliation(s)
- Angela López-Gil
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Carmen Nanclares
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Iago Méndez-López
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Carmen Martínez-Ramírez
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Cristóbal de Los Rios
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, c/ Diego de León, 62, 28006, Madrid, Spain
| | - J Fernando Padín-Nogueira
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Mayte Montero
- Instituto de Biologia y Genética Molecular, Universidad de Valladolid, c/ Sanz y Forés, 3, 47003, Valladolid, Spain
| | - Luis Gandía
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain
| | - Antonio G García
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4, 28029, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, c/ Diego de León, 62, 28006, Madrid, Spain
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11
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Calvo-Gallardo E, López-Gil Á, Méndez-López I, Martínez-Ramírez C, Padín JF, García AG. Faster kinetics of quantal catecholamine release in mouse chromaffin cells stimulated with acetylcholine, compared with other secretagogues. J Neurochem 2016; 139:722-736. [PMID: 27649809 DOI: 10.1111/jnc.13849] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 08/16/2016] [Accepted: 08/31/2016] [Indexed: 11/27/2022]
Abstract
Adrenal chromaffin cells (CCs) have been used extensively in studies aimed at revealing the intricacies of the Ca2+ -dependent early and late steps of regulated exocytosis. They have also served as invaluable models to study the kinetics of single-vesicle exocytotic events to infer the characteristics of opening and closing of the exocytotic fusion pore. We have here tested the hypothesis that stimulation at room temperature of CCs from mice C57BL/6 with physiological acetylcholine (ACh) and with other secretagogues (dimethylphenylpiperazinium, high K+ , muscarine, histamine, caffeine), alone or in combination, could trigger amperometric spike events with different kinetics. We found that mean secretory spike events in CCs stimulated with ACh had a fast rise rate of 25 pA/ms and a rapid decay time of 6.2 ms, with a small quantal size (0.31 pC). Surprisingly, these parameters considerably differed from those found in CCs stimulated with all other secretagogues that triggered secretory responses with spike events having smaller rise rates, longer decay times and higher quantal sizes. ACh spikes were unaltered by atropine but mitochondrial protonophore carbonyl cyanide-4-(trifluoromethoxy)phenylhydrazone markedly slowed down the rate rise and decay time, and augmented the quantal size of mean secretory events. We conclude that the physiological neurotransmitter ACh triggers a fast and efficient exocytotic response that cannot be mimicked by other secretagogues; such response is regulated by the mitochondrial circulation of calcium ions.
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Affiliation(s)
- Enrique Calvo-Gallardo
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Ángela López-Gil
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Iago Méndez-López
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Carmen Martínez-Ramírez
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Juan Fernando Padín
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Antonio G García
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.,Servicio de Farmacología Clínica, Hospital Universitario de La Princesa, Madrid, Spain.,Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa, Madrid, Spain
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12
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Regulation by L channels of Ca(2+)-evoked secretory responses in ouabain-treated chromaffin cells. Pflugers Arch 2016; 468:1779-92. [PMID: 27558258 DOI: 10.1007/s00424-016-1866-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 07/21/2016] [Accepted: 08/08/2016] [Indexed: 10/21/2022]
Abstract
It is known that the sustained depolarisation of adrenal medullary bovine chromaffin cells (BCCs) with high K(+) concentrations produces an initial sharp catecholamine release that subsequently fades off in spite depolarisation persists. Here, we have recreated a sustained depolarisation condition of BCCs by treating them with the Na(+)/K(+) ATPase blocker ouabain; in doing so, we searched experimental conditions that permitted the development of a sustained long-term catecholamine release response that could be relevant during prolonged stress. BCCs were perifused with nominal 0Ca(2+) solution, and secretion responses were elicited by intermittent application of short 2Ca(2+) pulses (Krebs-HEPES containing 2 mM Ca(2+)). These pulses elicited a biphasic secretory pattern with an initial 30-min period with secretory responses of increasing amplitude and a second 30-min period with steady-state, non-inactivating responses. The initial phase was not due to gradual depolarisation neither to gradual increases of the cytosolic calcium transients ([Ca(2+)]c) elicited by 2Ca(2+) pulses in BBCs exposed to ouabain; both parameters increased soon after ouabain addition. Νifedipine blocked these responses, and FPL64176 potentiated them, suggesting that they were triggered by Ca(2+) entry through non-inactivating L-type calcium channels. This was corroborated by nifedipine-evoked blockade of the L-type Ca(2+) channel current and the [Ca(2+)]c transients elicited by 2Ca(2+) pulses. Furthermore, the plasmalemmal Na(+)/Ca(2+) exchanger (NCX) blocker SEA0400 caused a mild inhibition followed by a large rebound increase of the steady-state secretory responses. We conclude that these two phases of secretion are mostly contributed by Ca(2+) entry through L calcium channels, with a minor contribution of Ca(2+) entry through the reverse mode of the NCX.
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13
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Crespo-Castrillo A, Punzón E, de Pascual R, Maroto M, Padín JF, García-Álvarez I, Nanclares C, Ruiz-Pascual L, Gandía L, Fernández-Mayoralas A, García AG. Novel synthetic sulfoglycolipid IG20 facilitates exocytosis in chromaffin cells through the regulation of sodium channels. J Neurochem 2015; 135:880-96. [DOI: 10.1111/jnc.13357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 08/03/2015] [Accepted: 08/19/2015] [Indexed: 11/27/2022]
Affiliation(s)
- Andrea Crespo-Castrillo
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Eva Punzón
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Ricardo de Pascual
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Departamento de Farmacología; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Marcos Maroto
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Juan Fernando Padín
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Departamento de Farmacología; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | | | - Carmen Nanclares
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Departamento de Farmacología; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Lucía Ruiz-Pascual
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | - Luis Gandía
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Departamento de Farmacología; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
| | | | - Antonio G. García
- Instituto Teófilo Hernando; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Departamento de Farmacología; Facultad de Medicina; Universidad Autónoma de Madrid; Madrid Spain
- Servicio de Farmacología Clínica; Instituto de Investigación Sanitaria; Hospital Universitario de La Princesa; Madrid Spain
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14
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Enhanced Ca2+-induced Ca2+ release from intracellular stores contributes to catecholamine hypersecretion in adrenal chromaffin cells from spontaneously hypertensive rats. Pflugers Arch 2015; 467:2307-23. [DOI: 10.1007/s00424-015-1702-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/02/2015] [Accepted: 03/08/2015] [Indexed: 01/09/2023]
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15
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Fernández-Morales JC, Fernando Padín J, Vestring S, Musial DC, de Diego AMG, García AG. Blockade by NNC 55-0396, mibefradil, and nickel of calcium and exocytotic signals in chromaffin cells: Implications for the regulation of hypoxia-induced secretion at early life. Eur J Pharmacol 2015; 751:1-12. [DOI: 10.1016/j.ejphar.2015.01.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 01/12/2015] [Accepted: 01/15/2015] [Indexed: 12/11/2022]
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16
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Calvo-Gallardo E, de Pascual R, Fernández-Morales JC, Arranz-Tagarro JA, Maroto M, Nanclares C, Gandía L, de Diego AMG, Padín JF, García AG. Depressed excitability and ion currents linked to slow exocytotic fusion pore in chromaffin cells of the SOD1(G93A) mouse model of amyotrophic lateral sclerosis. Am J Physiol Cell Physiol 2014; 308:C1-19. [PMID: 25377090 DOI: 10.1152/ajpcell.00272.2014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Altered synaptic transmission with excess glutamate release has been implicated in the loss of motoneurons occurring in amyotrophic lateral sclerosis (ALS). Hyperexcitability or hypoexcitability of motoneurons from mice carrying the ALS mutation SOD1(G93A) (mSOD1) has also been reported. Here we have investigated the excitability, the ion currents, and the kinetics of the exocytotic fusion pore in chromaffin cells from postnatal day 90 to postnatal day 130 mSOD1 mice, when motor deficits are already established. With respect to wild-type (WT), mSOD1 chromaffin cells had a decrease in the following parameters: 95% in spontaneous action potentials, 70% in nicotinic current for acetylcholine (ACh), 35% in Na(+) current, 40% in Ca(2+)-dependent K(+) current, and 53% in voltage-dependent K(+) current. Ca(2+) current was increased by 37%, but the ACh-evoked elevation of cytosolic Ca(2+) was unchanged. Single exocytotic spike events triggered by ACh had the following differences (mSOD1 vs. WT): 36% lower rise rate, 60% higher decay time, 51% higher half-width, 13% lower amplitude, and 61% higher quantal size. The expression of the α3-subtype of nicotinic receptors and proteins of the exocytotic machinery was unchanged in the brain and adrenal medulla of mSOD1, with respect to WT mice. A slower fusion pore opening, expansion, and closure are likely linked to the pronounced reduction in cell excitability and in the ion currents driving action potentials in mSOD1, compared with WT chromaffin cells.
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Affiliation(s)
| | - Ricardo de Pascual
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | | | | | - Marcos Maroto
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain
| | - Carmen Nanclares
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain
| | - Luis Gandía
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | | | - Juan-Fernando Padín
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Antonio G García
- Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Servicio de Farmacología Clínica, Hospital Universitario de La Princesa, Madrid, Spain; and Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa, Madrid, Spain
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17
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Fernández-Morales JC, Padín JF, Arranz-Tagarro JA, Vestring S, García AG, de Diego AMG. Hypoxia-elicited catecholamine release is controlled by L-type as well as N/PQ types of calcium channels in rat embryo chromaffin cells. Am J Physiol Cell Physiol 2014; 307:C455-65. [PMID: 24990647 DOI: 10.1152/ajpcell.00101.2014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
At early life, the adrenal chromaffin cells respond with a catecholamine surge under hypoxic conditions. This response depends on Ca(2+) entry through voltage-activated calcium channels (VACCs). We have investigated here three unresolved questions that concern this response in rat embryo chromaffin cells (ECCs): 1) the relative contribution of L (α1D, Cav1.3), N (α1B, Cav2.2), and PQ (α1A, Cav2.1) to the whole cell Ca(2+) current (ICa); 2) the relative contribution of L and N/PQ channels to the cytosolic Ca(2+) elevations triggered by hypoxia (Δ[Ca(2+)]c); and 3) the role of L and non-L high-VACCs in the regulation of the catecholamine surge occurring during prolonged (1 min) hypoxia exposure of ECCs. Nimodipine halved peak ICa and blocked 60% the total Ca(2+) entry during a 50-ms depolarizing pulse to 0 mV (QCa). Combined ω-agatoxin IVA plus ω-conotoxin GVIA (Aga/GVIA) blocked 30% of both ICa peak and QCa. This relative proportion of L- and non-L VACCs was corroborated by Western blot that indicated 55, 23, and 25% relative expression of L, N, and PQ VACCs. Exposure of ECCs to hypoxia elicited a mild but sustained Δ[Ca(2+)]c; the area of Δ[Ca(2+)]c was blocked 50% by nifedipine and 10% by Aga/GVIA. Exposure of ECCs to 1-min hypoxia elicited an initial transient burst of amperometric secretory spikes followed by scattered spikes along the time of cell exposure to hypoxia. This bulk response was blocked 85% by nimodipine and 35% by Aga/GVIA. Histograms on secretory spike frequency vs. time indicated a faster initial inactivation when Ca(2+) entry took place through N/PQ channels; more sustained secretion but at a lower rate was associated to Ca(2+) entry through L channels. The results suggest that the HIS response may initially be controlled by L and P/Q channels, but later on, N/PQ channels inactivate and the delayed HIS response is maintained at lower rate by slow-inactivating L channels.
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Affiliation(s)
- José-Carlos Fernández-Morales
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Juan-Fernando Padín
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Juan-Alberto Arranz-Tagarro
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Stefan Vestring
- Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Antonio G García
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain; and
| | - Antonio Miguel G de Diego
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain;
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18
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Caricati-Neto A, Padín JF, Silva-Junior ED, Fernández-Morales JC, de Diego AMG, Jurkiewicz A, García AG. Novel features on the regulation by mitochondria of calcium and secretion transients in chromaffin cells challenged with acetylcholine at 37°C. Physiol Rep 2013; 1:e00182. [PMID: 24744861 PMCID: PMC3970745 DOI: 10.1002/phy2.182] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/01/2013] [Indexed: 01/14/2023] Open
Abstract
From experiments performed at room temperature, we know that the buffering of Ca2+ by mitochondria contributes to the shaping of the bulk cytosolic calcium transient ([Ca2+]c) and secretion transients of chromaffin cells stimulated with depolarizing pulses. We also know that the mitochondrial Ca2+ transporters and the release of catecholamine are faster at 37°C with respect to room temperature. Therefore, we planned this investigation to gain further insight into the contribution of mitochondrial Ca2+ buffering to the shaping of [Ca2+]c and catecholamine release transients, using some novel experimental conditions that have not been yet explored namely: (1) perifusion of bovine chromaffin cells (BCCs) with saline at 37°C and their repeated challenging with the physiological neurotransmitter acetylcholine (ACh); (2) separate blockade of mitochondrial Ca2+ uniporter (mCUP) with Ru360 or the mitochondrial Na+/Ca2+ exchanger (mNCX) with CGP37157; (3) full blockade of the mitochondrial Ca2+ cycling (mCC) by the simultaneous inhibition of the mCUP and the mNCX. Ru360 caused a pronounced delay of [Ca2+]c clearance and augmented secretion. In contrast, CGP37157 only caused a tiny delay of [Ca2+]c clearance and a mild decrease in secretion. The mCC resulting in continued Ca2+ uptake and its release back into the cytosol was interrupted by combined Ru360 + CGP37157 (Ru/CGP), the protonophore carbonyl cyanide‐p‐trifluoromethoxyphenylhydrazone, or combined oligomycin + rotenone (O/R); these three treatments caused a mild but sustained elevation of basal [Ca2+]c that, however, was not accompanied by a parallel increase in basal secretion. Nevertheless, all treatments caused a pronounced augmentation of ACh‐induced secretion, with minor changes of the ACh‐induced [Ca2+]c transients. Combined Ru/CGP did not alter the resting membrane potential in current‐clamped cells. Additionally, Ru/CGP did not increase basal [Ca2+]c near subplasmalemmal sites and caused a mild decrease in the size of the readily releasable vesicle pool. Our results provide new functional features in support of the view that in BCCs there are two subpopulations of mitochondria, M1 underneath the plasmalemma nearby exocytotic sites and M2 at the core cell nearby vesicle transport sites. While M1 serves to shape the ACh‐elicited exocytotic response through its efficient Ca2+ removal by the mCUP, M2 shapes the lower [Ca2+]c elevations required for new vesicle supply to the exocytotic machinery, from the large reserve vesicle pool at the cell core. The mCUP of the M1 pool seems to play a more prominent role in controlling the ACh responses, in comparison with the mNCX. Regulation by mitochondria of exocytosis at 37°C.
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Affiliation(s)
- Afonso Caricati-Neto
- Departamento de Farmacología, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Juan-Fernando Padín
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, Madrid, 28029, Spain ; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, 28029Madrid, Spain
| | - Edilson-Dantas Silva-Junior
- Departamento de Farmacología, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - José-Carlos Fernández-Morales
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, Madrid, 28029, Spain ; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, 28029Madrid, Spain
| | - Antonio-Miguel G de Diego
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, Madrid, 28029, Spain ; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, 28029Madrid, Spain
| | - Aron Jurkiewicz
- Departamento de Farmacología, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Antonio G García
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, Madrid, 28029, Spain ; Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, 28029Madrid, Spain ; Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, C/Diego de León, 62, Madrid, 28006, Spain
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Padín JF, Fernández-Morales JC, Olivares R, Vestring S, Arranz-Tagarro JA, Calvo-Gallardo E, de Pascual R, Gandía L, García AG. Plasmalemmal sodium-calcium exchanger shapes the calcium and exocytotic signals of chromaffin cells at physiological temperature. Am J Physiol Cell Physiol 2013; 305:C160-72. [PMID: 23596174 DOI: 10.1152/ajpcell.00016.2013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The activity of the plasmalemmal Na(+)/Ca(2+) exchanger (NCX) is highly sensitive to temperature. We took advantage of this fact to explore here the effects of the NCX blocker KB-R7943 (KBR) at 22 and 37°C on the kinetics of Ca(2+) currents (ICa), cytosolic Ca(2+) ([Ca(2+)]c) transients, and catecholamine release from bovine chromaffin cells (BCCs) stimulated with high K(+), caffeine, or histamine. At 22°C, the effects of KBR on those parameters were meager or nil. However, at 37°C whereby the NCX is moving Ca(2+) at a rate fivefold higher than at 22°C, various of the effects of KBR were pronounced, namely: 1) no effects on ICa; 2) reduction of the [Ca(2+)]c transient amplitude and slowing down of its rate of clearance; 3) blockade of the K(+)-elicited quantal release of catecholamine; 4) blockade of burst catecholamine release elicited by K(+); 5) no effect on catecholamine release elicited by short K(+) pulses (1-2 s) and blockade of the responses produced by longer K(+) pulses (3-5 s); and 6) potentiation of secretion elicited by histamine or caffeine. Furthermore, the more selective NCX blocker SEA0400 also potentiated the secretory responses to caffeine. The results suggest that at physiological temperature the NCX substantially contributes to shaping the kinetics of [Ca(2+)]c transients and the exocytotic responses elicited by Ca(2+) entry through Ca(2+) channels as well as by Ca(2+) release from the endoplasmic reticulum.
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20
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de Pascual R, Miranda-Ferreira R, Galvão KM, Lameu C, Ulrich H, Smaili SS, Jurkiewicz A, García AG, Gandía L. Lower density of L-type and higher density of P/Q-type of calcium channels in chromaffin cells of hypertensive, compared with normotensive rats. Eur J Pharmacol 2013; 706:25-35. [PMID: 23499685 DOI: 10.1016/j.ejphar.2013.02.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 01/19/2013] [Accepted: 02/24/2013] [Indexed: 10/27/2022]
Abstract
Enhanced activity of the sympatho-adrenal axis and augmented circulating catecholamines has been implicated in the development of hypertension. Release of catecholamine from stimulated adrenal medulla chromaffin cells has been shown to be higher and longer in spontaneously hypertensive rats (SHRs), compared with normotensive Wistar rats (NWRs). Whether differences in the functional expression of voltage-dependent calcium channels (VDCCs) of the L-, N-, or P/Q subtypes may contribute to such distinct secretory behaviour, is unknown. We therefore approached here this study in voltage-clamped NWR and SHR chromaffin cells, using 10mM Ba(2+) as charge carrier (IBa) and selective blockers of each channel type. We found that compared with NWR cells, SHR chromaffin cells exhibited the following differences: (1) 30% diminution of the IBa fraction carried by L channels; (2) a doubling of the IBa fraction carried by P/Q channels; (3) more visible current modulation by ATP that could be linked to a 10-fold higher mRNA levels for purinergic receptors of the P2Y2 subtype; and (3) a higher contribution of PQ channels to the transients of the cytosolic calcium concentrations ([Ca(2+)]c) generated by K(+), compared with L channels. These results may contribute to the better understanding of the greater calcium signalling and exocytotic responses of SHR compared with NWR chromaffin cells, found in three previous reports from our laboratories.
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Affiliation(s)
- Ricardo de Pascual
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Spain
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21
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Fernández-Morales JC, Arranz-Tagarro JA, Calvo-Gallardo E, Maroto M, Padín JF, García AG. Stabilizers of neuronal and mitochondrial calcium cycling as a strategy for developing a medicine for Alzheimer's disease. ACS Chem Neurosci 2012; 3:873-83. [PMID: 23173068 DOI: 10.1021/cn3001069] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 08/29/2012] [Indexed: 12/21/2022] Open
Abstract
For the last two decades, most efforts on new drug development to treat Alzheimer's disease have been focused to inhibit the synthesis of amyloid beta (Aβ), to prevent Aβ deposition, or to clear up Aβ plaques from the brain of Alzheimer's disease (AD) patients. Other pathogenic mechanisms such as the hyperphosphorylation of the microtubular tau protein (that forms neurofibrillary tangles) have also been addressed as, for instance, with inhibitors of the enzyme glycogen synthase-3 kinase beta (GSK3β). However, in spite of their proven efficacy in animal models of AD, all these compounds have so far failed in clinical trials done in AD patients. It seems therefore desirable to explore new concepts and strategies in the field of drug development for AD. We analyze here our hypothesis that a trifunctional chemical entity acting on the L subtype of voltage-dependent Ca(2+) channels (VDCCs) and on the mitochondrial Na(+)/Ca(2+) exchanger (MNCX), and having additional antioxidant properties, may efficiently delay or stop the death of vulnerable neurons in the brain of AD patients. In recent years, evidence has accumulated indicating that enhanced neuronal Ca(2+) cycling (NCC) and futile mitochondrial Ca(2+) cycling (MCC) are central stage in activating calpain and calcineurin, as well as the intrinsic mitochondrial pathway for apoptosis, leading to death of vulnerable neurons. An additional contributing factor to neuronal death is the excess free radical production linked to distortion of Ca(2+) homeostasis. We propose that an hybrid compound containing a dihydropyridine moiety (to block L channels and mitigate Ca(2+) entry) and a benzothiazepine moiety (to block the MNCX and slow down the rate of Ca(2+) efflux from the mitochondrial matrix into the cytosol), as well as a polyphenol moiety (to sequester excess free radicals) could break down the pathological enhanced NCC and MCC, thus delaying the initiation of apoptosis and the death of vulnerable neurons. In so doing, such a trifunctional compound could eventually become a neuroprotective medicine capable of delaying disease progression in AD patients.
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Affiliation(s)
| | - Juan-Alberto Arranz-Tagarro
- Departamento de Farmacología,
Facultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | | | | | | | - Antonio G. García
- Servicio de Farmacología
Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de La Princesa, Madrid, Spain
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de Diego AMG, Lorrio S, Calvo-Gallardo E, García AG. Smaller quantal size and faster kinetics of single exocytotic events in chromaffin cells from the APP/PS1 mouse model of Alzheimer's disease. Biochem Biophys Res Commun 2012; 428:482-6. [PMID: 23123627 DOI: 10.1016/j.bbrc.2012.10.082] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2012] [Accepted: 10/22/2012] [Indexed: 10/27/2022]
Abstract
The kinetics of single-amperometric exocytotic events has been measured in chromaffin cells of C57 mice and in an APP/PS1 mouse model of Alzheimer's disease (AD). K(+) depolarisation causes a burst of spikes that indicate the quantal release of the single-vesicle content of catecholamine. The kinetic analysis of 278 spikes from 10 control cells and 520 spikes from 18 APP/PS1 cells shows the following features of the latter compared with the former: (i) 45% lower t(1/2); (ii) 60% smaller quantal size; (iii) 50% lower decay time. Spike feet also showed 60% smaller quantal size. Immunofluorescence and thioflavin staining showed no amyloid beta (Aβ) burden in adrenal medulla slices of APP/PS1 mice that however exhibited dense Aβ plaques in the cortex and hippocampus. Furthermore, acetylcholinesterase staining of adrenal medulla indicated no apparent differences in the innervation by splanchnic cholinergic nerve terminals of chromaffin cells from control and APP/PS1 mice. This is the first report identifying subtle differences in the last steps of exocytosis that could be an indication of synaptic dysfunction of the secretory machinery not linked to Aβ burden in AD.
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Affiliation(s)
- Antonio M G de Diego
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain.
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23
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Lopez-Jimenez ME, González JC, Lizasoain I, Sánchez-Prieto J, Hernández-Guijo JM, Torres M. Functional cGMP-gated channels in cerebellar granule cells. J Cell Physiol 2012; 227:2252-63. [PMID: 21809342 DOI: 10.1002/jcp.22964] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cyclic nucleotide-gated channels (CNGCs) are important transducers of external signals in sensory processes. These channels are ubiquitously expressed in a variety of neurons, and are necessary to transduce signals for growth cone guidance and plasticity. Here, we demonstrate that the CNGC subunits (CNGA1 and CNGB1, presumably the 1b isoform) are expressed in rat cerebellar granule cells and that they combine to form functional channels. The expression of the mRNAs that encode these proteins is maximal after 7 days in cell culture, when the channels are expressed at synapses and co-localize with the synaptic marker synapsin I. These ligand-gated channels are functional and can be blocked by Mg(2+) or L-cis-diltiazem. Moreover, channel opening in response to increases in intracellular cGMP results in Ca(2+) entry into the cell. Chronic blockade (96 h) of these channels with L-cis-diltiazem significantly decreases the number of functional boutons, as determined by their capacity to load and unload the styryl dye FM1-43 when stimulated. Moreover, the unloading kinetics is modified from a biphasic to a monophasic profile in a subset of synaptic boutons. These channels are also expressed in early developmental stages, both in the soma and in emerging processes, and CNGA1 can be detected in growth cones. Pharmacological blockade of these channels with L-cis-diltiazem causes an overall change in growth cone morphology, impairing the formation of lamellipodia between filopodia and increasing the number of filopodia. J
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Affiliation(s)
- Ma Elena Lopez-Jimenez
- Facultad de Veterinaria, Departamento de Bioquímica, Universidad Complutense, Madrid, Spain
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24
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Cytosolic organelles shape calcium signals and exo–endocytotic responses of chromaffin cells. Cell Calcium 2012; 51:309-20. [DOI: 10.1016/j.ceca.2011.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Revised: 12/02/2011] [Accepted: 12/05/2011] [Indexed: 01/09/2023]
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25
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Milla J, Montesinos MS, Machado JD, Borges R, Alonso E, Moreno-Ortega AJ, Cano-Abad MF, García AG, Ruiz-Nuño A. Ouabain enhances exocytosis through the regulation of calcium handling by the endoplasmic reticulum of chromaffin cells. Cell Calcium 2011; 50:332-42. [PMID: 21741086 DOI: 10.1016/j.ceca.2011.06.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 05/23/2011] [Accepted: 06/09/2011] [Indexed: 11/18/2022]
Abstract
The augmentation of neurotransmitter and hormone release produced by ouabain inhibition of plasmalemmal Na+/K+-ATPase (NKA) is well established. However, the mechanism underlying this action is still controversial. Here we have shown that in bovine adrenal chromaffin cells ouabain diminished the mobility of chromaffin vesicles, an indication of greater number of docked vesicles at subplasmalemmal exocytotic sites. On the other hand, ouabain augmented the number of vesicles undergoing exocytosis in response to a K+ pulse, rather than the quantal size of single vesicles. Furthermore, ouabain produced a tiny and slow Ca2+ release from the endoplasmic reticulum (ER) and gradually augmented the transient elevations of the cytosolic Ca2+ concentrations ([Ca2+]c) triggered by K+ pulses. These effects were paralleled by gradual increments of the transient catecholamine release responses triggered by sequential K+ pulses applied to chromaffin cell populations treated with ouabain. Both, the increases of K+-elicited [Ca2+]c and secretion in ouabain-treated cells were blocked by thapsigargin (THAPSI), 2-aminoethoxydiphenyl borate (2-APB) and caffeine. These results are compatible with the view that ouabain may enhance the ER Ca2+ load and facilitate the Ca2+-induced-Ca2+ release (CICR) component of the [Ca2+]c signal generated during K+ depolarisation. This could explain the potentiating effects of ouabain on exocytosis.
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Affiliation(s)
- Juan Milla
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, and Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa, Madrid, Spain
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26
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N-Acylaminophenothiazines: Neuroprotective agents displaying multifunctional activities for a potential treatment of Alzheimer’s disease. Eur J Med Chem 2011; 46:2224-35. [DOI: 10.1016/j.ejmech.2011.03.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 02/28/2011] [Accepted: 03/02/2011] [Indexed: 11/19/2022]
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27
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Fernández-Morales JC, Yáñez M, Orallo F, Cortés L, González JC, Hernández-Guijo JM, García AG, de Diego AMG. Blockade by nanomolar resveratrol of quantal catecholamine release in chromaffin cells. Mol Pharmacol 2010; 78:734-44. [PMID: 20631052 DOI: 10.1124/mol.110.066423] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The cardiovascular protecting effects of resveratrol, an antioxidant polyphenol present in grapes and wine, have been attributed to its vasorelaxing effects and to its anti-inflammatory, antioxidant, and antiplatelet actions. Inhibition of adrenal catecholamine release has also been recently implicated in its cardioprotecting effects. Here, we have studied the effects of nanomolar concentrations of resveratrol on quantal single-vesicle catecholamine release in isolated bovine adrenal chromaffin cells. We have found that 30 to 300 nM concentrations of resveratrol blocked the acetylcholine (ACh) and high K(+)-evoked quantal catecholamine release, amperometrically measured with a carbon fiber microelectrode. At these concentrations, resveratrol did not affect the whole-cell inward currents through nicotinic receptors or voltage-dependent sodium and calcium channels, neither the ACh- or K(+)-elicited transients of cytosolic Ca(2+). Blockade by nanomolar resveratrol of secretion in ionomycin- or digitonin-treated cells suggests an intracellular site of action beyond Ca(2+)-dependent exocytotic steps. The fact that nanomolar resveratrol augmented cGMP is consistent with the view that resveratrol could be blocking the quantal secretion of catecholamine through a nitric oxide-linked mechanism. Because this effect occurs at nanomolar concentrations, our data are relevant in the context of the low circulating levels of resveratrol found in moderate consumers of red wines, which could afford cardioprotection by mitigating the catecholamine surge occurring during stress.
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de Diego AMG. Electrophysiological and morphological features underlying neurotransmission efficacy at the splanchnic nerve-chromaffin cell synapse of bovine adrenal medulla. Am J Physiol Cell Physiol 2009; 298:C397-405. [PMID: 19940070 DOI: 10.1152/ajpcell.00440.2009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The ability of adrenal chromaffin cells to fast-release catecholamines relies on their capacity to fire action potentials (APs). However, little attention has been paid to the requirements needed to evoke the controlled firing of APs. Few data are available in rodents and none on the bovine chromaffin cell, a model extensively used by researchers. The aim of this work was to clarify this issue. Short puffs of acetylcholine (ACh) were fast perifused to current-clamped chromaffin cells and produced the firing of single APs. Based on the currents generated by such ACh applications and previous literature, current waveforms that efficiently elicited APs at frequencies up to 20 Hz were generated. Complex waveforms were also generated by adding simple waveforms with different delays; these waveforms aimed at modeling the stimulation patterns that a chromaffin cell would conceivably undergo upon strong synaptic stimulation. Cholinergic innervation was assessed using the acetylcholinesterase staining technique on the supposition that the innervation pattern is a determinant of the kind of stimuli chromaffin cells can receive. It is concluded that 1) a reliable method to produce frequency-controlled APs by applying defined current injection waveforms is achieved; 2) the APs thus generated have essentially the same features as those spontaneously emitted by the cell and those elicited by fast-ACh perifusion; 3) the higher frequencies attainable peak at around 30 Hz; and 4) the bovine adrenal medulla shows abundant cholinergic innervation, and chromaffin cells show strong acetylcholinesterase staining, consistent with a tight cholinergic presynaptic control of firing frequency.
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Affiliation(s)
- Antonio M G de Diego
- Departamento de Farmacología y Terapéutica, Facultad de Medicina, Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4, 28029 Madrid, Spain.
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29
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Arce MP, Rodríguez-Franco MI, González-Muñoz GC, Pérez C, López B, Villarroya M, López MG, García AG, Conde S. Neuroprotective and Cholinergic Properties of Multifunctional Glutamic Acid Derivatives for the Treatment of Alzheimer’s Disease. J Med Chem 2009; 52:7249-57. [DOI: 10.1021/jm900628z] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Mariana P. Arce
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | | | | | - Concepción Pérez
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Beatriz López
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Mercedes Villarroya
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029 Madrid, Spain
| | - Manuela G. López
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029 Madrid, Spain
| | - Antonio G. García
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo 4, 28029 Madrid, Spain
| | - Santiago Conde
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
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Nicolau SM, de Diego AMG, Cortés L, Egea J, González JC, Mosquera M, López MG, Hernández-Guijo JM, García AG. Mitochondrial Na+/Ca2+-exchanger blocker CGP37157 protects against chromaffin cell death elicited by veratridine. J Pharmacol Exp Ther 2009; 330:844-54. [PMID: 19509314 DOI: 10.1124/jpet.109.154765] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2025] Open
Abstract
Mitochondrial calcium (Ca(2+)) dyshomeostasis constitutes a critical step in the metabolic crossroads leading to cell death. Therefore, we have studied here whether 7-chloro-5-(2-chlorophenyl)-1,5-dihydro-4,1-benzothiazepin-2(3H)-one (CGP37157; CGP), a blocker of the mitochondrial Na(+)/Ca(2+)-exchanger (mNCX), protects against veratridine-elicited chromaffin cell death, a model suitable to study cell death associated with Ca(2+) overload. Veratridine produced a concentration-dependent cell death, measured as lactate dehydrogenase released into the medium after a 24-h incubation period. CGP rescued cells from veratridine-elicited death in a concentration-dependent manner; its EC(50) was approximately 10 microM, and 20 to 30 microM caused near 100% cytoprotection. If preincubated for 30 min and washed out for 3 min before adding veratridine, CGP still afforded significant cytoprotection. At 30 microM, CGP blocked the veratridine-elicited free radical production, mitochondrial depolarization, and cytochrome c release. At this concentration, CGP also inhibited the Na(+) and Ca(2+) currents by 50 to 60% and the veratridine-elicited oscillations of cytosolic Ca(2+). This drastic cytoprotective effect of CGP could be explained in part through its regulatory actions on the mNCX.
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Affiliation(s)
- Santos M Nicolau
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4, 28029-Madrid, Spain
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Fernández-Morales JC, Cortés-Gil L, García AG, de Diego AMG. Differences in the quantal release of catecholamines in chromaffin cells of rat embryos and their mothers. Am J Physiol Cell Physiol 2009; 297:C407-18. [DOI: 10.1152/ajpcell.00086.2009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Studies on the bulk catecholamine release from fetal and neonatal rat adrenals, adrenal slices, or isolated chromaffin cells stimulated with high K+, hypoxia, hypercapnia, or acidosis are available. However, a study analyzing the kinetics of quantal secretion is lacking. We report here such a study in which we compare the quantal release of catecholamines from immature rat embryo chromaffin cells (ECCs) and their mothers' (MCCs). Cell challenging with a strong depolarizing stimulus (75 mM K+) caused spike bursts having the following characteristics. ECCs released more multispike events and wave envelopes than MCCs. This, together with narrower single-spike events, a faster decay, and a threefold smaller quantal size suggest a faster secretory machinery in ECCs. Furthermore, with a milder stimulus (25 mM K+) enhanced Ca2+ entry by L-type Ca2+ channel activator BAY K 8644 did not change the kinetic parameters of single spikes in ECCs; in contrast, augmentation of Ca2+ entry increased spike amplitude and width, quantal size, and decay time in MCCs. This suggests that in mature MCCs, the last exocytotic steps are more tightly regulated than in immature ECCs. Finally, we found that quantal secretion was fully controlled by L-type voltage-dependent Ca2+ channels (VDCCs) in ECCs, whereas both L- and non-L VDCCs (N and PQ) contributed equally to secretion control in MCCs. Our results have the following physiological, pharmacological, and clinical relevance: 1) they may help to better understand the regulation of adrenal catecholamine release in response to stress during fetal life and delivery; 2) if clinically used, L-type Ca2+ channel blockers may augment the incidence of sudden infant death syndrome (SIDS); and 3) so-called Ca2+ promotors or activators of Ca2+ entry through L-type VDCCs may be useful to secure a healthy catecholamine surge upon violent stress during fetal life, at birth, or to prevent the SIDS in neonates at risk.
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Tapia L, García-Eguiagaray J, García AG, Gandía L. Preconditioning stimuli that augment chromaffin cell secretion. Am J Physiol Cell Physiol 2009; 296:C792-800. [PMID: 19211912 DOI: 10.1152/ajpcell.00600.2008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have investigated here whether a preconditioned stimulation of nicotinic and muscarinic receptors augmented the catecholamine release responses elicited by supramaximal 3-s pulses of 100 muM acetylcholine (100ACh) or 100 mM K(+) (100K(+)) applied to fast-perifused bovine adrenal chromaffin cells. Threshold concentrations of nicotine (1-3 muM) that caused only a tiny secretion did, however, augment the responses elicited by 100ACh or 100K(+) by 2- to 3.5-fold. This effect was suppressed by mecamylamine and by Ca(2+) deprivation, was developed with a half-time (t(1/2)) of 1 min, and was reversible. The nicotine effect was mimicked by threshold concentrations of ACh, choline, epibatidine, and oxotremorine-M but not by methacholine. Threshold concentrations of K(+) caused lesser potentiation of secretion compared with that of threshold nicotine. The data are compatible with an hypothesis implying 1) that continuous low-frequency sympathetic discharge places chromaffin cells at the adrenal gland in a permanent "hypersensitive" state; and 2) this allows an explosive secretion of catecholamines by high-frequency sympathetic discharge during stress.
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Affiliation(s)
- Laura Tapia
- Instituto Teófilo Hernando, Facultad de Medicina, Universidad Autónoma de Madrid, Arzobispo Morcillo, 4. 28029 Madrid, Spain
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A low nicotine concentration augments vesicle motion and exocytosis triggered by K+ depolarisation of chromaffin cells. Eur J Pharmacol 2008; 598:81-6. [DOI: 10.1016/j.ejphar.2008.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Revised: 08/21/2008] [Accepted: 09/01/2008] [Indexed: 11/19/2022]
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34
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Díaz-Prieto N, Herrera-Peco I, de Diego AMG, Ruiz-Nuño A, Gallego-Sandín S, López MG, García AG, Cano-Abad MF. Bcl2 mitigates Ca2+ entry and mitochondrial Ca2+ overload through downregulation of L-type Ca2+ channels in PC12 cells. Cell Calcium 2008; 44:339-52. [DOI: 10.1016/j.ceca.2008.01.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Revised: 01/21/2008] [Accepted: 01/24/2008] [Indexed: 10/22/2022]
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35
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de Diego AMG, Arnáiz-Cot JJ, Hernández-Guijo JM, Gandía L, García AG. Differential variations in Ca2+ entry, cytosolic Ca2+ and membrane capacitance upon steady or action potential depolarizing stimulation of bovine chromaffin cells. Acta Physiol (Oxf) 2008; 194:97-109. [PMID: 18485124 DOI: 10.1111/j.1748-1716.2008.01871.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS This study looks into the physiology of the exocytosis of catecholamines released by adrenal medullary chromaffin cells. We have comparatively explored the exocytotic responses elicited by two different patterns of depolarizing stimulation: the widely employed square depolarizing pulses (DPs) and trains of acetylcholine-like action potentials (APs), likely the physiological mode of stimulation in the intact innervated adrenal medulla. APs were applied at 30 Hz, a frequency similar to that produced in a stressful situation. METHODS Patch-clamp, cell membrane capacitance, single cell amperometry and fluorescence were the techniques used. The variations of calcium entry measured as the integral of the calcium current, cytosolic calcium (measured with the calcium-sensitive fluorescent probe fluo-4) and exo-endocytosis (membrane capacitance variations) were the parameters measured. RESULTS Trains of AP depolarizations produced distinct responses compared to those of square depolarizations: (1) Calcium current amplitude decreased to a lesser extent along the AP train; (2) calcium entry and capacitance increments raised linearly with stimulation time whereas they deviated from linearity when square depolarizations were used; (3) slower activation and faster delayed decay phase of cytosolic calcium transients; (4) capacitance increments varied linearly with calcium entry with APs and deviated from linearity with longer depolarizations; (5) little endocytosis after stimulation with longer trains of APs and pronounced endocytosis with longer square depolarizations. CONCLUSIONS Stimulation of chromaffin cells with trains of APs produced patterns of cytosolic calcium transients, exocytotic and endocytotic responses quite different from those elicited by the widely employed DPs. Our study is relevant from the methodological and physiological points of view.
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Affiliation(s)
- A M G de Diego
- Facultad de Medicina, Instituto Teófilo Hernando, Universidad Autónoma de Madrid, Madrid, Spain.
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de Diego AMG, Gandía L, García AG. A physiological view of the central and peripheral mechanisms that regulate the release of catecholamines at the adrenal medulla. Acta Physiol (Oxf) 2008; 192:287-301. [PMID: 18005392 DOI: 10.1111/j.1748-1716.2007.01807.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Here we review the tight neural control of the differential secretion into the circulation, of the adrenal medullary hormones adrenaline and noradrenaline. One or the other catecholamines are differentially released on various stress conditions. This is specifically controlled by central nervous system nuclei at the cortex, hypothalamus and spinal cord. Different firing patterns of splanchnic nerves and nicotinic or muscarinic receptors cause the selective release of noradrenaline or adrenaline, to adapt the body to the 'fight or flight' reaction, or during severe hypoglycaemia, haemorrhage, cold, acute myocardial infarction or other severe stressful conflicts. Endogenously acetylcholine (ACh) released at the splanchnic nerve-chromaffin cell synapse, acting on muscarinic and nicotinic receptors, causes membrane depolarization and action potentials (AP) in chromaffin cells. These changes vary with the animal species, the cell preparation (intact bisected adrenal, adrenal slices, or isolated fresh or cultured cells) or the recording technique (intracellular microelectrodes, patch-clamp, perforated-patch, cell-attached). Conflicting results leave many open questions concerning the actions of ACh on chromaffin cell excitability. The use of adrenal slices and field electrical stimulation will surely provide new insights into these mechanisms. Chromaffin cells have been thoroughly used as models to study the relationship between Ca2+ entry, cytosolic Ca2+ signals, exocytosis and endocytosis, using patch-clamp and amperometric techniques. Cells have been stimulated with single depolarizing pulses (DPs), DP trains and with simulated AP waveforms. These approaches have provided useful information but we have no data on APs generated by pulsatile secretory quanta of ACh, trying to mimic the intermittent and repetitive splanchnic nerve discharge of the neurotransmitter. We present some recent experiments using ultrashort ACh pulses (25 ms), that cause non-desensitizing repetitive APs with each ACh pulse, at low ACh concentrations (30 microM). Ultrashort pulses of a high ACh concentration (1000 microM) causes a single AP followed by a prolonged depolarization. It could be interesting trying to correlate these 'patterns of splanchnic nerve discharge' with Ca2+ signals and exocytosis. This, together with the use of adrenal slices and transmural electrical stimulation of splanchnic nerves will provide new physiologically sound data on the regulation of adrenal medullary secretion.
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Affiliation(s)
- A M G de Diego
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
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de Pascual R, García AG. Ouabain augments and maintains the catecholamine release responses evoked by repetitive pulses of potassium, caffeine or histamine in perifused bovine chromaffin cells. Eur J Pharmacol 2007; 568:99-105. [PMID: 17560566 DOI: 10.1016/j.ejphar.2007.04.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2007] [Revised: 04/11/2007] [Accepted: 04/17/2007] [Indexed: 11/23/2022]
Abstract
Cardiac glycosides such as ouabain augment the release of neurotransmitters and hormones from various organs, tissues and cell systems. Here we have investigated novel aspects of the ouabain effects on fast-perifused bovine adrenal chromaffin cells subjected to repetitive stimulation during long-time periods with secretagogues that enhance Ca(2+) entry (i.e. 100 mM K(+)solution) or causing the release into the cytosol of the Ca(2+) stored in the endoplasmic reticulum (i.e. 20 mM caffeine or 100 microM histamine). After 1 h of intermittent stimulation, the amperometrically measured catecholamine release responses decayed to 50% with K(+) pulses, and to 10-15% with caffeine or histamine pulses. Ouabain (10 microM) augmented 2-fold the K(+) secretory responses and kept them high, along an hour. When given after the responses had decayed upon repetitive caffeine or histamine pulsing, ouabain gradually restored such responses to their initial control values. On the basis of these results, we raise the hypothesis that ouabain may facilitate the handling by the cell of the endoplasmic reticulum Ca(2+) fluxes that are known to be involved in secretory vesicle transport and the regulation of exocytosis. This may have physiological and pathological interest in the light of an endogenous ouabain steroid found in the adrenal cortex.
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Affiliation(s)
- Ricardo de Pascual
- Instituto Teófilo Hernando, Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/ Arzobispo Morcillo, 4; 28029, Madrid, Spain
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