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Protein & Peptide Letters

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ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

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Research Article

Proteomic Analysis of Glucose-Induced Cardiac Myoblasts and the Potential Role of mir-92b-5p in Regulating Sarcomere Proteins Under a Hyperglycemic Environment

Author(s): Priyanka Mathur and Vibha Rani*

Volume 29, Issue 11, 2022

Published on: 07 October, 2022

Page: [937 - 945] Pages: 9

DOI: 10.2174/0929866529666220819121325

Price: $65

Abstract

Background: Diabetes mellitus, a common metabolic disorder that causes high blood glucose, is due to impaired insulin secretion. Prolonged high blood sugar is associated with heart disease. Many proteins are involved in metabolic pathways and contractility of cardiac cells regulate cardiac hypertrophy, altering normal cardiac physiology and function. Moreover, microRNAs are essential regulators of these proteins. Thus, there is a need to study the protein and microRNA alterations in cardiomyocytes to better understand the mechanisms activated during cardiac stress.

Objective: The study aims to profile differentially expressed sarcomere proteins in H9C2 cell lines under high glucose conditions compared with normal conditions, along with the identification of miRNAs regulating these proteins.

Methods: Cardiac myoblast cell lines were treated with D-Glucose at three concentrations (10 mM, 25 mM, and 50 mM). Total cell protein was analyzed by Tandem Mass spectrometry Nano LCMS/ MS. Furthermore, next-generation sequencing data were analyzed for detecting microRNAs regulating cardiac cell protein expression. Bioinformatics databases such as Uniprot, Ingenuity Pathway Analysis (IPA), PANTHER, and Target scan were used.

Results: The Nano LC-MS/MS analysis showed 2891 protein, 1351 protein groups, and 4381 peptide groups in both glucose-treated and control samples. Most proteins were metabolite interconversion enzymes, translation proteins, and proteins regulating the cytoskeleton. IPA analysis revealed differentially expressed proteins involved in EIF2 signaling, actin cytoskeleton signaling, cardiac fibrosis, and cell death. Moreover, the proteins troponin, tropomyosin, myosin, alpha-actin, and ATP synthase were found to be downregulated, thus responsible for altering sarcomere protein expression. Rno-mir-92b-5p was observed to be highly upregulated at 50 mM. Its target genes namely TPM2, ATP1A2, and CORO1C were mostly components of the sarcomere complex and its regulators.

Conclusion: A combination of proteomic profile and microRNA profile of hyperglycemic cells provides an insight into advanced therapeutics. Our study has highlighted the role of sarcomere proteins, activation of Eukaryotic Initiation Factor 2 (EIF2) signaling, and suppression of actin cytoskeleton signaling in the pathophysiology of cardiomyopathy. MiR-92b-5p has an important role in regulating sarcomere protein complex activated.

Keywords: Proteomics, diabetes mellitus, cardiac myoblast cell line, Tandem Mass spectrometry, Nano LC-MS/MS, sarcomere proteins, microRNA, IPA (Ingenuity Pathway Analysis)

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