Cenderitide

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Cenderitide
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  • glycyl-L-leucyl-L-seryl-L-lysylglycyl-L-cysteinyl-L-phenylalanylglycyl-L-leucyl-L-lysyl-L-leucyl-L-α-aspartyl-L-arginyl-L-isoleucylglycyl-L-seryl-L-methionyl-L-serylglycyl-L-leucylglycyl-L-cysteinyl-L-prolyl-L-seryl-L-leucyl-L-arginyl-L-α-aspartyl-L-prolyl-L-arginyl-L-prolyl-L-asparaginyl-L-alanyl-L-prolyl-L-seryl-L-threonyl-L-seryl-L-alanine, cyclic (6→22)-disulfide
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Cenderitide (also known as chimeric natriuretic peptide or CD-NP) is a natriuretic peptide developed by the Mayo Clinic as a potential treatment for heart failure. [1] [2] [3] Cenderitide is created by the fusion of the 15 amino acid C-terminus of the snake venom dendroaspis natriuretic peptide (DNP) with the full C-type natriuretic peptide (CNP) structure. [2] This peptide chimera is a dual activator of the natriuretic peptide receptors NPR-A and NPR-B and therefore exhibits the natriuretic and diuretic properties of DNP, as well as the antiproliferative and antifibrotic properties of CNP. [1] [3]

Contents

Molecular problem: fibrosis

When faced with pressure overload, the heart attempts to compensate with a number of structural alterations including hypertrophy of cardiomyocytes and increase of extracellular matrix (ECM) proteins. [4] [5] Rapid accumulation of ECM proteins causes excessive fibrosis resulting in decreased myocardial compliance and increased myocardial stiffness. [5] [6] The exact mechanisms involved in excessive fibrosis are not fully understood but there is evidence that supports involvement from local growth factors FGF-2, TGF-beta and platelet-derived growth factor. [7] [8] [9] TGF-β1 plays an important role in cardiac remodelling through the stimulation of fibroblast proliferation, ECM deposition and myocyte hypertrophy. [10] [11] [12] The increase in TGF-beta 1 expression in a pressure-overloaded heart correlates with the degree of fibrosis, suggesting TGF-beta 1 involvement in the progression from a compensated hypertrophy to failure. [13] [14] Through an autocrine mechanism, TGF-beta 1 acts on fibroblasts by binding TGF-beta 1 receptors 1 and 2. Upon receptor activation, the receptor-associated transcription factor Smad becomes phosphorylated and associates with Co-Smad. [15] This newly formed Smad-Co-Smad complex enters the nucleus where it acts as a transcription factor modulating gene expression. [15] Cardiac remodelling of the ECM is also regulated by the CNP/NPR-B pathway as demonstrated by the improved outcomes in transgenic mice with CNP over-expression subjected to myocardial infarction. [16] [17] Binding of CNP to NPR-B catalyzes the synthesis of cGMP, which is responsible for mediating the anti-fibrotic effects of CNP. [18] Fibrotic heart tissue is associated with an increase risk of ventricular dysfunction which can ultimately lead to heart failure. [5] [19] Thus, anti-fibrotic strategies are a promising approach in the prevention and treatment of heart failure.

Molecular mechanism

As cenderitide interacts with both NRP-A and NRP-B, this drug has antifibrotic potential. [1] Binding of cenderitide to NRP-B elicits an antifibrotic response by catalyzing formation of cGMP similar to the response seen with endogenous CNP. Additionally, in vitro study of human fibroblasts demonstrates that cenderitide reduces TGF-beta 1 induced collagen production. [1] [20] These two proposed mechanisms illustrate therapeutic potential for the reduction of fibrotic remodelling in the hypertensive heart. Through combined effects of CNP and DNP, cenderitide treatment results in a reduction in stress on the heart (through natriuresis/diuresis) and inhibition of pro-fibrotic, remodeling pathways. [1]

Related Research Articles

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Atrial natriuretic peptide (ANP) or atrial natriuretic factor (ANF) is a natriuretic peptide hormone secreted from the cardiac atria that in humans is encoded by the NPPA gene. Natriuretic peptides are a family of hormone/paracrine factors that are structurally related. The main function of ANP is causing a reduction in expanded extracellular fluid (ECF) volume by increasing renal sodium excretion. ANP is synthesized and secreted by cardiac muscle cells in the walls of the atria in the heart. These cells contain volume receptors which respond to increased stretching of the atrial wall due to increased atrial blood volume.

<span class="mw-page-title-main">Fibrosis</span> Excess connective tissue in healing

Fibrosis, also known as fibrotic scarring, is a pathological wound healing in which connective tissue replaces normal parenchymal tissue to the extent that it goes unchecked, leading to considerable tissue remodelling and the formation of permanent scar tissue.

In cardiology, ventricular remodeling refers to changes in the size, shape, structure, and function of the heart. This can happen as a result of exercise or after injury to the heart muscle. The injury is typically due to acute myocardial infarction, but may be from a number of causes that result in increased pressure or volume, causing pressure overload or volume overload on the heart. Chronic hypertension, congenital heart disease with intracardiac shunting, and valvular heart disease may also lead to remodeling. After the insult occurs, a series of histopathological and structural changes occur in the left ventricular myocardium that lead to progressive decline in left ventricular performance. Ultimately, ventricular remodeling may result in diminished contractile (systolic) function and reduced stroke volume.

<span class="mw-page-title-main">Transforming growth factor beta</span> Cytokine

Transforming growth factor beta (TGF-β) is a multifunctional cytokine belonging to the transforming growth factor superfamily that includes three different mammalian isoforms and many other signaling proteins. TGFB proteins are produced by all white blood cell lineages.

Adenosine A<sub>1</sub> receptor Cell surface receptor found in humans

The adenosine A1 receptor (A1AR) is one member of the adenosine receptor group of G protein-coupled receptors with adenosine as endogenous ligand.

<span class="mw-page-title-main">Myofibroblast</span>

A myofibroblast is a cell phenotype that was first described as being in a state between a fibroblast and a smooth muscle cell.

Cardiac fibrosis commonly refers to the excess deposition of extracellular matrix in the cardiac muscle, but the term may also refer to an abnormal thickening of the heart valves due to inappropriate proliferation of cardiac fibroblasts. Fibrotic cardiac muscle is stiffer and less compliant and is seen in the progression to heart failure. The description below focuses on a specific mechanism of valvular pathology but there are other causes of valve pathology and fibrosis of the cardiac muscle.

<span class="mw-page-title-main">Natriuretic peptide</span>

A natriuretic peptide is a hormone molecule that plays a crucial role in the regulation of the cardiovascular system. These hormones were first discovered in the 1980s and were found to have very strong diuretic, natriuretic, and vasodilatory effects. There are three main types of natriuretic peptides: atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP), and C-type natriuretic peptide (CNP). Two minor hormones include Urodilatin (URO) which is processed in the kidney and encoded by the same gene as ANP, and Dendroaspis NP (DNP) that was discovered through isolation of the venom from the green mamba snake. Since they are activated during heart failure, they are important for the protection of the heart and its tissues.

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<span class="mw-page-title-main">Dermatopontin</span> Protein-coding gene in the species Homo sapiens

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<span class="mw-page-title-main">Diabetic cardiomyopathy</span> Medical condition

Diabetic cardiomyopathy is a disorder of the heart muscle in people with diabetes. It can lead to inability of the heart to circulate blood through the body effectively, a state known as heart failure(HF), with accumulation of fluid in the lungs or legs. Most heart failure in people with diabetes results from coronary artery disease, and diabetic cardiomyopathy is only said to exist if there is no coronary artery disease to explain the heart muscle disorder.

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<span class="mw-page-title-main">Myocardial scarring</span>

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<span class="mw-page-title-main">Galectin-3</span> Protein-coding gene in the species Homo sapiens

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<span class="mw-page-title-main">Pirfenidone</span> Chemical compound

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<span class="mw-page-title-main">Heart failure with preserved ejection fraction</span> Medical condition

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<span class="mw-page-title-main">Brain natriuretic peptide 32</span> Hormone secreted in the heart

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