β1-Adrenergic receptor autoantibodies are associated with deleterious consequences; however, the IgG3 subclass provides beneficial outcomes in human heart failure. β1AR autoantibody inhibits G-protein coupling, simultaneously activating ERK through G-protein–independent arrestin-dependent mechanisms.

BACKGROUND Autoantibodies directed against the beta1-adrenergic receptor have been described in patients with dilated cardiomyopathy. These autoantibodies exert an agonistic, chronotropic effect on spontaneously beating cultured neonatal rat cardiomyocytes. We studied the effect of such antibodies on beta1-adrenergic receptor expression. METHODS AND RESULTS Cardiomyocytes were incubated with ...

We discuss the functional roles of β₂-adrenergic receptors in skeletal muscle hypertrophy and atrophy as well as the adaptive responses of β₂-adrenergic receptor expression to anabolic and catabolic conditions. β₂-Adrenergic receptor stimulation using anabolic drugs increases muscle mass by promoting muscle protein synthesis and/or attenuating protein degradation. These effects are prevented by...

PURPOSE Determine whether Compound 49b treatment ameliorates retinal changes due to the lack of β2-adrenergic receptor signaling. METHODS Using retinas from 3-month-old β2-adrenergic receptor-deficient mice, we treated mice with our novel β1-/β2-adrenergic receptor agonist, Compound 49b, to assess the effects of adrenergic agonists acting only on β1-adrenergic receptors due to the absence of ...

Cancer is one of the leading causes death in world. Researchers keep attempting to develop therapy modalities decrease mortality and morbidity cancer patients by trying comprehend effect sympathetic nerves (through catecholamine adrenergic receptors) development. Catecholamine activation β-adrenergic receptors (β1-AR, β2-AR, β3-AR) may influence cytokine immunity system, initiate tumorigenesis,...

Background—Autoantibodies directed against the b1-adrenergic receptor have been described in patients with dilated cardiomyopathy. These autoantibodies exert an agonistic, chronotropic effect on spontaneously beating cultured neonatal rat cardiomyocytes. We studied the effect of such antibodies on b1-adrenergic receptor expression. Methods and Results—Cardiomyocytes were incubated with either t...

Experimental studies in preclinical mouse models of breast cancer have shown that chronic restraint stress can enhance disease progression by increasing catecholamine levels and subsequent signaling of β-adrenergic receptors. Catecholamines also signal α-adrenergic receptors, and greater α-adrenergic signaling has been shown to promote breast cancer in vitro and in vivo. However, antagonism of ...

Pressure overload ventricular hypertrophy is accompanied by dysfunctional b-adrenergic receptor signaling due to increased levels of the b-adrenergic receptor kinase-1, which phosphorylates and desensitizes b-adrenergic receptors. In this study, we examined whether increased b-adrenergic receptor kinase 1 expression is associated with myocardial hypertrophy induced by adrenergic stimulation. Wi...

Participation of brown adipose tissue [through the action of the uncoupling protein-1 (UCP1)] in adaptive adrenergic nonshivering thermogenesis is recognized, but the existence of a response to adrenergic stimulation in UCP1-ablated mice implies that a mechanism for an alternative adaptive adrenergic thermogenesis may exist. Here, we have used UCP1-ablated mice to examine the existence of an al...

As the aged population is soaring, prevalence of osteoporosis is increasing. However, the molecular basis underlying the regulation of bone mass is still incompletely understood. Sympathetic tone acts via beta2 adrenergic receptors in bone and regulates the mass of bone which is the target organ of parathyroid hormone (PTH). However, whether beta2 adrenergic receptor is regulated by PTH in bone...