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      Papel de la expresión de regucalcina en el tejido hepático: revisión sistemática Translated title: Role of regucalcin expression in liver tissue: systematic review

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          Abstract

          Resumen Objetivo. El propósito de este trabajo fue revisar la literatura científica con relación al papel de la expresión de la regucalcina (SMP30) en el hígado. Método. Se realizó una búsqueda bibliográfica en la base de datos PubMed. Se encontraron 89 artículos. Tras analizar su contenido y aplicar los criterios de inclusión y exclusión, un total de 9 artículos fueron incluidos. Resultados. Se determinó que la expresión de SMP30 es significativamente mayor en el hígado en comparación con otros tejidos como pulmones, bazo, miocardio, próstata y piel (P < 0.05). Se observó, tras obtener muestras de 137 pacientes (30 controles hepáticos normales, 10 con hepatitis B, 49 con cirrosis hepática y 48 con carcinoma hepatocelular (HCC)) que la expresión de SMP30 fue del 100% en todos los tejidos adyacentes al hígado, a excepción del HCC, que solo mostró el 81% de expresión de SMP30 en el hígado. Sobre las concentraciones séricas de SMP30 se observó que 3 grupos distintos mostraron concentraciones diferentes de SMP30: grupo control (1.72 ng/mL), pacientes con hepatitis crónica (3.76 ng/mL) y pacientes con insuficiencia hepática (5.46 ng/mL), teniendo los pacientes con insuficiencia hepática aguda una concentración significativamente mayor de SMP30 que el resto de grupos (P< 0.01), los pacientes con insuficiencia hepática también presentaron una concentración significativamente mayor que el grupo control de pacientes sanos (P< 0.01). Sobre la proliferación de células HepG2 se ha demostrado que la incorporación de manera exógena de SMP30 suprime la elevación del número de células HepG2, revelando así que la proliferación de las células HepG2 fue suprimida con los niveles fisiológicos de SMP30 presente en suero in vitro. Conclusión. La SMP30podría desempeñar un papel fundamental sobre la supervivencia en pacientes con HCC, así como, su posible funcionamiento como proteína protectora de la apoptosis en células HepG2.

          Translated abstract

          Abstract Objective. The purpose of this work has been to review the scientific literature regarding the role of regucalcin expression in the liver. Method. A bibliographic search was carried out on the PubMed database. Eighty-nine articles were found. After analyzing their content and applying inclusion and exclusion criteria, a total of 9 articles were included. Results. It was determined that SMP30 expression is significantly higher in the liver compared to other tissues such as lungs, spleen, myocardium, prostate and skin (P < 0.05). It was observed, after obtaining samples from 137 patients (30 normal liver controls, 10 with hepatitis B, 49 with liver cirrhosis and 48 with hepatocellular carcinoma) that SMP30 expression was 100% in all tissues adjacent to the liver except for hepatocellular carcinoma (HCC), which showed only 81% of protein expression. On serum regucalcin concentrations it was observed, that 3 different groups with different concentrations of SMP30: control group (1.72 ng/ mL), patients with chronic hepatitis (3.76 ng/mL) and patients with liver failure (5.46 ng/ mL) patients with acute liver failure had higher concentrations of SMP30 than patients with hepatitis B (P< 0.01), as well as the serum concentrations of the latter showed to be higher than in healthy patients (P< 0.01). On the proliferation of HepG2 cells it has been shown that the addition of exogenous SMP30 suppresses the elevation of cell numbers, thus revealing that HepG2 cell proliferation was suppressed with the physiological levels of SMP30 present in serum in vitro. Conclusion. Regucalcin could play a key role in survival in patients with hepatocellular carcinoma, as well as its possible role as a protective protein for apoptosis in HepG2 cells.

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          An integrated, functionally annotated gene map of the DXS8026-ELK1 interval on human Xp11.3-Xp11.23: potential hotspot for neurogenetic disorders.

          Human chromosome Xp11.3-Xp11.23 encompasses the map location for a growing number of diseases with a genetic basis or genetic component. These include several eye disorders, syndromic and nonsyndromic forms of X-linked mental retardation (XLMR), X-linked neuromuscular diseases and susceptibility loci for schizophrenia, type 1 diabetes, and Graves' disease. We have constructed an approximately 2.7-Mb high-resolution physical map extending from DXS8026 to ELK1, corresponding to a genetic distance of approximately 5.5 cM. A combination of chromosome walking and sequence-tagged site (STS)-content mapping resulted in an integrated framework and transcript map, precisely positioning 10 polymorphic microsatellites (one of which is novel), 16 ESTs, and 12 known genes (RP2, PCTK1, UHX1, UBE1, RBM10, ZNF157, SYN1, ARAF1, TIMP1, PFC, ELK1, UXT). The composite map is currently anchored with 89 STSs to give an average resolution of approximately 1 STS every 30 kb. By a combination of EST database searches and in silico detection of UniGene clusters within genomic sequence generated from this template map, we have mapped several novel genes within this interval: a Na+/H+ exchanger (SLC9A7), at least two zincfinger transcription factors (KIAA0215 and Hs.68318), carbohydrate sulfotransferase-7 (CHST7), regucalcin (RGN), inactivation-escape-1 (INE1), the human ortholog of mouse neuronal protein 15.6, and four putative novel genes. Further genomic analysis enabled annotation of the sequence interval with 20 predicted pseudogenes and 21 UniGene clusters of unknown function. The combined PAC/BAC transcript map and YAC scaffold presented here clarifies previously conflicting data for markers and genes within the Xp11.3-Xp11.23 interval and provides a powerful integrated resource for functional characterization of this clonally unstable, yet gene-rich and clinically significant region of proximal Xp.
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            Purification of calcium binding substance from soluble fraction of normal rat liver.

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              Role of regucalcin in calcium signaling.

              Regucalcin was discovered in 1978 as a calcium-binding protein that does not contain EF-hand motif of Ca(2+)-binding domain [M. Yamaguchi and T. Yamamoto, Chem. Pharm. Bull. 26 1915-1918 (1978)]. In recent years, regucalcin has been demonstrated to play an important role as a regulatory protein in Ca2+ signaling in rat liver and kidney cells. The organization of the rat regucalcin gene consists of seven exons and six introns. The mRNA is mainly present in liver and kidney with a size of 1.8 kb. Hepatic regucalcin mRNA expression has been shown to be stimulated by various factors including calcium, calcitonin, insulin, and estrogen in rats. The mRNA is also expressed in hepatoma cells (Morris hepatoma, HepG2, and rat hepatoma H4-II-E cells). Regucalcin plays a role in the maintenance of intracellular Ca2+ homeostasis due to activating Ca2+ pump enzymes in the plasma membrane (basolateral membrane) and microsomes of liver and renal cortex cells. Moreover, regucalcin has an inhibitory effect on the activation of Ca2+/calmodulin-dependent enzymes and protein kinase C. Also, regucalcin has been demonstrated to regulate nuclear function in liver cells; it can inhibit Ca(2+)-activated DNA fragmentation, DNA and RNA synthesis, protein kinase and protein phosphatase activities in the nuclei. Such an effect is also seen in the nuclei of regenerating rat liver. Regucalcin may play a physiological role in the control for overexpression of proliferative cells. Regucalcin has been proposed to be an important regulatory protein in Ca2+ signaling system, and it plays a multifunctional role in liver and kidney cells.
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                Author and article information

                Journal
                jonnpr
                Journal of Negative and No Positive Results
                JONNPR
                Research and Science S.L. (Madrid, Madrid, Spain )
                2529-850X
                March 2022
                : 7
                : 1
                : 18-27
                Affiliations
                [1] Cáceres Extremadura orgnameUniversidad de Extremadura orgdiv1Faculty of Sport Sciences orgdiv2Health, Economy, Motricity and Education (HEME) Research Group Spain
                Article
                S2529-850X2022000100018 S2529-850X(22)00700100018
                10.19230/jonnpr.4066
                04ef8e7d-dfb9-4c20-837a-952dc161b56a

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 26 October 2020
                : 17 May 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 10
                Product

                SciELO Spain

                Categories
                Revisión

                RGN,células HepG2,carcinoma hepatocelular,Apoptosis,SMP30,biochemical markers,HepG2 cells,hepatocellular carcinoma,marcadores bioquímicos

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