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]
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]
References
^ abcdeMcKie PM, Sangaralingham SJ, Burnett JC (September 2010). "CD-NP: an innovative designer natriuretic peptide activator of particulate guanylyl cyclase receptors for cardiorenal disease". Current Heart Failure Reports. 7 (3): 93–9. doi:10.1007/s11897-010-0016-6. PMID20582736. S2CID23726451.
^Bonnin CM, Sparrow MP, Taylor RR (November 1981). "Collagen synthesis and content in right ventricular hypertrophy in the dog". The American Journal of Physiology. 241 (5): H708–13. doi:10.1152/ajpheart.1981.241.5.H708. PMID7304760.
^Weber KT, Swamynathan SK, Guntaka RV, Sun Y (1999). "Angiotensin II and extracellular matrix homeostasis". The International Journal of Biochemistry & Cell Biology. 31 (3–4): 395–403. doi:10.1016/s1357-2725(98)00125-3. PMID10224666.
^Villarreal FJ, Lee AA, Dillmann WH, Giordano FJ (April 1996). "Adenovirus-mediated overexpression of human transforming growth factor-beta 1 in rat cardiac fibroblasts, myocytes and smooth muscle cells". Journal of Molecular and Cellular Cardiology. 28 (4): 735–42. doi:10.1006/jmcc.1996.0068. PMID8732501.
^Ichiki T, Huntley BK, Sangaralingham SJ, Chen HH, Burnett Jr JC (2009). "A novel designer natriuretic peptide CD-NP suppresses TGF-beta 1 induced collagen type I production in human cardiac fibroblasts". Journal of Cardiac Failure. 15 (6 supplement): S34. doi:10.1016/j.cardfail.2009.06.318.
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