1
|
Hegedűs L, Zámbó B, Pászty K, Padányi R, Varga K, Penniston JT, Enyedi Á. Molecular Diversity of Plasma Membrane Ca2+ Transporting ATPases: Their Function Under Normal and Pathological Conditions. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1131:93-129. [DOI: 10.1007/978-3-030-12457-1_5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
2
|
Acosta-Montaño P, Rodríguez-Velázquez E, Ibarra-López E, Frayde-Gómez H, Mas-Oliva J, Delgado-Coello B, Rivero IA, Alatorre-Meda M, Aguilera J, Guevara-Olaya L, García-González V. Fatty Acid and Lipopolysaccharide Effect on Beta Cells Proteostasis and its Impact on Insulin Secretion. Cells 2019; 8:cells8080884. [PMID: 31412623 PMCID: PMC6721695 DOI: 10.3390/cells8080884] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/02/2019] [Accepted: 08/06/2019] [Indexed: 02/07/2023] Open
Abstract
Metabolic overload by saturated fatty acids (SFA), which comprises β-cell function, and impaired glucose-stimulated insulin secretion are frequently observed in patients suffering from obesity and type 2 diabetes mellitus. The increase of intracellular Ca2+ triggers insulin granule release, therefore several mechanisms regulate Ca2+ efflux within the β-cells, among others, the plasma membrane Ca2+-ATPase (PMCA). In this work, we describe that lipotoxicity mediated mainly by the saturated palmitic acid (PA) (16C) is associated with loss of protein homeostasis (proteostasis) and potentially cell viability, a phenomenon that was induced to a lesser extent by stearic (18C), myristic (14C) and lauric (12C) acids. PA was localized on endoplasmic reticulum, activating arms of the unfolded protein response (UPR), as also promoted by lipopolysaccharides (LPS)-endotoxins. In particular, our findings demonstrate an alteration in PMCA1/4 expression caused by PA and LPS which trigger the UPR, affecting not only insulin release and contributing to β-cell mass reduction, but also increasing reactive nitrogen species. Nonetheless, stearic acid (SA) did not show these effects. Remarkably, the proteolytic degradation of PMCA1/4 prompted by PA and LPS was avoided by the action of monounsaturated fatty acids such as oleic and palmitoleic acid. Oleic acid recovered cell viability after treatment with PA/LPS and, more interestingly, relieved endoplasmic reticulum (ER) stress. While palmitoleic acid improved the insulin release, this fatty acid seems to have more relevant effects upon the expression of regulatory pumps of intracellular Ca2+. Therefore, chain length and unsaturation of fatty acids are determinant cues in proteostasis of β-cells and, consequently, on the regulation of calcium and insulin secretion.
Collapse
Affiliation(s)
- Paloma Acosta-Montaño
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, 21000 Mexicali, Mexico
| | - Eustolia Rodríguez-Velázquez
- Facultad de Odontología, Universidad Autónoma de Baja California, 22390 Tijuana, Mexico
- Tecnológico Nacional de México/I.T. Tijuana, Centro de Graduados e Investigación en Química-Grupo de Biomateriales y Nanomedicina, 22510 Tijuana, Mexico
| | - Esmeralda Ibarra-López
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, 21000 Mexicali, Mexico
| | - Héctor Frayde-Gómez
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, 21000 Mexicali, Mexico
- Hospital General de Zona No. 30, Instituto Mexicano del Seguro Social, 21100 Mexicali, Mexico
| | - Jaime Mas-Oliva
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico
| | - Blanca Delgado-Coello
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico
| | - Ignacio A Rivero
- Tecnológico Nacional de México/I.T. Tijuana, Centro de Graduados e Investigación en Química, 22000 Tijuana, Mexico
| | - Manuel Alatorre-Meda
- Cátedras CONACyT- Tecnológico Nacional de México/I.T. Tijuana. Centro de Graduados e Investigación en Química-Grupo de Biomateriales y Nanomedicina, 22000 Tijuana, Mexico
| | - Jorge Aguilera
- Tecnológico Nacional de México/I.T. Tijuana, Centro de Graduados e Investigación en Química, 22000 Tijuana, Mexico
| | - Lizbeth Guevara-Olaya
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, 21000 Mexicali, Mexico
| | - Victor García-González
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, 21000 Mexicali, Mexico.
| |
Collapse
|
3
|
Alzugaray ME, García ME, Del Zotto HH, Raschia MA, Palomeque J, Rossi JP, Gagliardino JJ, Flores LE. Changes in islet plasma membrane calcium-ATPase activity and isoform expression induced by insulin resistance. Arch Biochem Biophys 2009; 490:17-23. [DOI: 10.1016/j.abb.2009.07.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 07/29/2009] [Accepted: 07/30/2009] [Indexed: 11/25/2022]
|
4
|
Szewczyk MM, Pande J, Grover AK. Caloxins: a novel class of selective plasma membrane Ca2+ pump inhibitors obtained using biotechnology. Pflugers Arch 2007; 456:255-66. [PMID: 17909851 DOI: 10.1007/s00424-007-0348-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Accepted: 09/06/2007] [Indexed: 12/22/2022]
Abstract
Plasma membrane Ca2+ pumps (PMCA) extrude cellular Ca2+ with a high affinity and hence play a major role in Ca2+ homeostasis and signaling. Caloxins (selective extracellular PMCA inhibitors) would aid in elucidating the physiology of PMCA. PMCA proteins have five extracellular domains (exdoms). Our hypotheses are: 1) peptides that bind selectively to each exdom can be invented by screening a random peptide library, and 2) a peptide can modulate PMCA activity by binding to one of the exdoms. The first caloxin 2a1, selected for binding exdom 2 was selective for PMCA (Ki=529 microM). It has been used to examine the physiological role of PMCA. PMCA isoforms are encoded by four genes. PMCA isoform expression differs in various cell types, with PMCA1 and 4 being the most widely distributed. There are differences between PMCA1-4 exdom 1 sequences, which may be exploited for inventing isoform selective caloxins. Using exdom 1 of PMCA4 as a target, modified screening procedures and mutagenesis led to the high-affinity caloxin 1c2 (Ki=2.3 microM for PMCA4). It is selective for PMCA4 over PMCA1, 2, or 3. We hope that caloxins can be used to discern the roles of individual PMCA isoforms in Ca2+ homeostasis and signaling. Caloxins may also become clinically useful in cardiovascular diseases, neurological disorders, retinopathy, cancer, and contraception.
Collapse
Affiliation(s)
- Magdalena M Szewczyk
- Department of Biology, McMaster University, HSC 4N41, 1200 Main Street W, Hamilton, ON L8N3Z5, Canada
| | | | | |
Collapse
|