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Treatment with CBA-NP a novel chimeric natriuretic peptide attenuates cardiorenal fibrosis and improves diastolic dysfunction in diabetic rat model


Diabetes is a major risk factor for left ventricular dysfunction with cardiac and renal fibrosis. C-type natriuretic peptide (CNP) is a 22 amino-acid peptide produced mainly in the cardiac endothelium with potent cardiac unloading, anti-fibrotic and antihypertensive effects, but minimal renal actions. Using this knowledge we designed a natriuretic peptide CBA-NP by fusing a 6 AA sequence (KVLRRH) from BNP to the C-terminus and a 5 AA sequence (RMDRI) from ANP to the N-terminus of CNP to enhance beneficial renal effects while maintaining CNP’s inherent cardioprotective properties.


Chronic treatment with CBA-NP will have direct anti-fibrotic and humoral effects in a rat model of diabetic cardiomyopathy.


Using three groups of six male Wistar rats, (normal control, diabetic control, and diabetic treated with CBA-NP) one dose of streptozotocin was administered to induce diabetes. One month after induction of diabetes ALZET pumps with 0.1μg/kg/min of CBA-NP or saline were serially implanted subcutaneously every 14 days over the course of 2 months. Cardiac function was assessed by echocardiography. Neurohormones by RIA. Fibrosis by picrosirius red staining. Ultrastructural features by electron microscopy.


CBA-NP treatment attenuated LV hypertrophy (0.24±.01 mg/g body weight) compared to diabetic control (0.26±.01) and was comparable to the normal control (0.24±.01). LV interstitial and perivascular fibrosis percentage was significantly reduced in the CBA-NP treated group (3.27 to 1.80 and 3.87 to 1.77) as compared to the diabetic control. Ejection fraction (84.0± 1.2% vs. 78.0±1.7 %) and fractional shortening (48±1.2% vs. 41±1%) were significantly improved after CBA-NP treatment compared to diabetic control. Kidney cortical and medullary percent fibrosis was significantly reduced (4.58±0.80 to 2.16±0.14 and 4.43±0.6 to 1.23±0.3) after CBA-NP treatment as compared to the untreated group. GFR significantly improved (1.74±0.18 to 2.42±0.18) with reduction in glomerular basement membrane thickness. There was a significant decrease in plasma renin, aldosterone and BNP, while plasma cGMP increased in the treated group compared to the untreated group.


CBA-NP treatment attenuated LV hypertrophy, reduced cardiac and renal fibrosis, and improved cardiac and renal function with suppression of renin and aldosterone, suggesting a potential therapeutic benefit in diabetic cardiomyopathy.

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Correspondence to Horng H Chen.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ameenuddin, S., Oehler, E.A., Burnett, J.C. et al. Treatment with CBA-NP a novel chimeric natriuretic peptide attenuates cardiorenal fibrosis and improves diastolic dysfunction in diabetic rat model. BMC Pharmacol 11 (Suppl 1), P2 (2011).

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