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• W2156107684 abstract "The role of <i>α</i>₁-adrenergic receptors (ARs) in the regulation of cardiac hypertrophy is still unclear, because transgenic mice demonstrated hypertrophy or the lack of it despite high receptor overexpression. To further address the role of the <i>α</i>₁-ARs in cardiac hypertrophy, we analyzed unique transgenic mice that overexpress constitutively active mutation (CAM) <i>α</i>_1A-ARs or CAM <i>α</i>_1B-ARs under the regulation of large fragments of their native promoters. These constitutively active receptors are expressed in all tissues that endogenously express their wild-type counterparts as opposed to only myocyte-targeted transgenic mice. In this study, we discovered that CAM <i>α</i>_1A-AR mice in vivo have cardiac hypertrophy independent of changes in blood pressure, corroborating earlier studies, but in contrast to myocyte-targeted <i>α</i>_1A-AR mice. We also found cardiac hypertrophy in CAM <i>α</i>_1B-AR mice, in agreement with previous studies, but hypertrophy only developed in older mice. We also discovered unique <i>α</i>₁-AR–mediated hypertrophic signaling that was AR subtype-specific with CAM <i>α</i>_1A-AR mice secreting atrial naturietic factor and interleukin-6 (IL-6), whereas CAM <i>α</i>_1B-AR mice expressed activated nuclear factor-<i>κ</i>B (NF-<i>κ</i>B). These particular hypertrophic signals were blocked when the other AR subtype was coactivated. We also discovered that crossbreeding the two CAM models (double CAM <i>α</i>_1A/B-AR) inhibited the development of hypertrophy and was reversible with single receptor activation, suggesting that coactivation of the receptors can lead to novel antagonistic signal transduction. This was confirmed by demonstrating antagonistic signals that were even lower than normal controls in the double CAM <i>α</i>_1A/B-AR mice for p38, NF-<i>κ</i>B, and the IL-6/glycoprotein 130/signal transducer and activator of transcription 3 pathway. Because <i>α</i>_1A/B double knockout mice fail to develop hypertrophy in response to IL-6, our results suggest that IL-6 is a major mediator of <i>α</i>_1A-AR cardiac hypertrophy." @default.
• W2156107684 created "2016-06-24" @default.
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• W2156107684 date "2013-02-12" @default.
• W2156107684 modified "2023-09-23" @default.
• W2156107684 title "α1A-Adrenergic Receptors Regulate Cardiac Hypertrophy In Vivo Through Interleukin-6 Secretion" @default.
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• W2156107684 doi "https://doi.org/10.1124/mol.112.084483" @default.
• W2156107684 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3629827" @default.
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