Magnesium accumulation upon cyclin M4 silencing activates microsomal triglyceride transfer protein improving NASH.
J Hepatol
; 75(1): 34-45, 2021 07.
Article
en En
| MEDLINE
| ID: mdl-33571553
ABSTRACT
BACKGROUND & AIMS:
Perturbations of intracellular magnesium (Mg2+) homeostasis have implications for cell physiology. The cyclin M family, CNNM, perform key functions in the transport of Mg2+ across cell membranes. Herein, we aimed to elucidate the role of CNNM4 in the development of non-alcoholic steatohepatitis (NASH).METHODS:
Serum Mg2+ levels and hepatic CNNM4 expression were characterised in clinical samples. Primary hepatocytes were cultured under methionine and choline deprivation. A 0.1% methionine and choline-deficient diet, or a choline-deficient high-fat diet were used to induce NASH in our in vivo rodent models. Cnnm4 was silenced using siRNA, in vitro with DharmaFECT and in vivo with Invivofectamine® or conjugated to N-acetylgalactosamine.RESULTS:
Patients with NASH showed hepatic CNNM4 overexpression and dysregulated Mg2+ levels in the serum. Cnnm4 silencing ameliorated hepatic lipid accumulation, inflammation and fibrosis in the rodent NASH models. Mechanistically, CNNM4 knockdown in hepatocytes induced cellular Mg2+ accumulation, reduced endoplasmic reticulum stress, and increased microsomal triglyceride transfer activity, which promoted hepatic lipid clearance by increasing the secretion of VLDLs.CONCLUSIONS:
CNNM4 is overexpressed in patients with NASH and is responsible for dysregulated Mg2+ transport. Hepatic CNNM4 is a promising therapeutic target for the treatment of NASH. LAYSUMMARY:
Cyclin M4 (CNNM4) is overexpressed in non-alcoholic steatohepatitis (NASH) and promotes the export of magnesium from the liver. The liver-specific silencing of Cnnm4 ameliorates NASH by reducing endoplasmic reticulum stress and promoting the activity of microsomal triglyceride transfer protein.Palabras clave
Texto completo:
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Base de datos:
MEDLINE
Asunto principal:
Proteínas Portadoras
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Hepatocitos
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Proteínas de Transporte de Catión
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Enfermedad del Hígado Graso no Alcohólico
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Magnesio
Límite:
Animals
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Humans
Idioma:
En
Revista:
J Hepatol
Asunto de la revista:
GASTROENTEROLOGIA
Año:
2021
Tipo del documento:
Article
País de afiliación:
España