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[Gene expression of beta-adrenoceptor signal transmitters in heart failure]
Objective:
To investigate the alteration in steady-state levels of messenger RNA(mRNA) of beta-adrenoceptor signal transmitters in heart failure.
Methods:
The reverse transcription polymerase chain reaction (RT-PCR) was used to assess gene expression in small quantity of circulatory lymphocytes. With selected oligonucleotide primers, we used quantitative RT-PCR to amplify mRNAs encoding beta 2-adrenergic receptor(beta 2-AR), adenylate cyclase (AC), beta 2-adrenergic receptor kinase(beta-ARK), and beta-arrestin and cAMP response element binding protein (CREB) in 16 healthy subjects and 30 heart-failing patients.
Results:
The alteration of gene expression in heart failure appeared to be selective, the steady-state levels of mRNA increased significantly involving AC and the transcription factor, CREB; decreased significantly involving membrane receptor, beta 2-AR; unchanged significantly involving phosphorylating factors of beta-AR uncoupling, beta-ARK and beta-arrestin.
Conclusion:
The aberrant gene expression of beta-adrenergic receptor might play an important role in the pathogenesis of heart failure.
Insights
Heart failure alters messenger RNA (mRNA) levels of beta-adrenergic signaling molecules. Key changes include increased adenylate cyclase (AC) and CREB mRNA, and decreased beta-2 adrenergic receptor (beta-2 AR) mRNA.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Genetics
Context:
- Heart failure is a complex cardiovascular disease.
- Beta-adrenergic signaling plays a crucial role in cardiac function.
- Alterations in gene expression are implicated in heart failure pathogenesis.
Purpose:
- To investigate messenger RNA (mRNA) expression levels of beta-adrenoceptor signaling components in heart failure patients.
- To quantify changes in beta-2 adrenergic receptor (beta-2 AR), adenylate cyclase (AC), beta-2 adrenergic receptor kinase (beta-ARK), beta-arrestin, and cAMP response element binding protein (CREB) mRNA.
Summary:
- Quantitative reverse transcription polymerase chain reaction (RT-PCR) was used to measure mRNA levels in lymphocytes from healthy subjects and heart failure patients.
- Results showed selective alterations: significant increases in AC and CREB mRNA, and a significant decrease in beta-2 AR mRNA.
- mRNA levels for beta-ARK and beta-arrestin remained unchanged.
Impact:
- Aberrant gene expression of the beta-adrenergic receptor system may contribute to the development of heart failure.
- Findings provide insights into the molecular mechanisms underlying heart failure.
- Identifies specific molecular targets for potential therapeutic interventions.