Long non-coding RNA MALAT1 regulates hyperglycaemia induced inflammatory process in the endothelial cells

Area of Science:

• Endocrinology
• Molecular Biology
• Genetics

Background:

• Endothelial dysfunction is a key complication of diabetes.
• Long non-coding RNAs (lncRNAs) are increasingly recognized for their roles in cellular regulation.
• Metastasis associated lung adenocarcinoma transcript 1 (MALAT1) is a lncRNA implicated in various cellular processes.

Purpose of the Study:

• To investigate the impact of glucose levels on MALAT1 expression in endothelial cells.
• To elucidate the role of MALAT1 in glucose-induced inflammation.
• To explore the potential of MALAT1 as a therapeutic target for diabetes-related vascular complications.

Main Methods:

• Human umbilical vein endothelial cells were cultured under varying glucose concentrations.
• MALAT1 expression was quantified using RT-qPCR.
• Expression of serum amyloid antigen 3 (SAA3), tumor necrosis factor alpha (TNF-α), and interleukin 6 (IL-6) was assessed.
• siRNA-mediated knockdown of MALAT1 was performed.
• Diabetic animal models were used to confirm findings in vivo.

Main Results:

• High glucose significantly increased MALAT1 expression in endothelial cells, peaking at 12 hours.
• Increased MALAT1 correlated with elevated SAA3 expression and subsequent upregulation of inflammatory mediators TNF-α and IL-6.
• Similar changes in MALAT1 and inflammatory markers were observed in renal tissues of diabetic animals.
• MALAT1 knockdown using siRNA prevented glucose-induced inflammatory responses.

Conclusions:

• LncRNA MALAT1 plays a critical role in mediating glucose-induced inflammation in endothelial cells.
• MALAT1 regulates the expression of inflammatory mediators IL-6 and TNF-α, partly through SAA3 activation.
• Targeting MALAT1 presents a promising therapeutic strategy for managing micro- and macrovascular complications associated with diabetes.