Neuroendocrine transcriptome in genetic hypertension: multiple changes in diverse adrenal physiological systems

Area of Science:

• Genomics
• Cardiovascular Research
• Neuroendocrinology

Background:

• The genetic underpinnings of hypertension, particularly in the BPH/2 mouse model, remain incompletely understood.
• Previous studies identified potential susceptibility loci for hereditary hypertension.

Purpose of the Study:

• To investigate the neuroendocrine transcriptome in the adrenal glands of genetically hypertensive (BPH/2) and low-blood pressure (BPL/1) mice.
• To determine the impact of genetic strain, age, and their interaction on gene expression patterns related to hypertension.

Main Methods:

• Utilized 12,488-probe set microarrays to analyze mRNA transcripts from adrenal glands of juvenile and adult BPH/2 and BPL/1 mice.
• Employed two-factor ANOVA and concordance coefficients to assess gene expression differences and reproducibility.
• Applied systems biology approaches and the Kolmogorov-Smirnov test to evaluate pathway disturbances.

Main Results:

• Identified significant differential gene expression across strain, age, and strain-by-age interaction.
• Observed widespread alterations in BPH/2 mice, including increased sympathochromaffin transcripts, altered vasoconstrictor/vasodilator systems, reduced carbohydrate metabolism, and elevated oxidative stress.
• Confirmed microarray findings with real-time polymerase chain reaction (PCR).

Conclusions:

• Genetic hypertension in BPH/2 mice is characterized by global alterations in diverse physiological pathways within the adrenal gland.
• Findings suggest increased sympathetic stimulation, metabolic dysregulation, and oxidative stress contribute to the hypertensive phenotype.
• These results provide a foundation for further research into the pathogenesis of genetic hypertension.