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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Protein Restriction in the Peri-Pubertal Period Induces Autonomic Dysfunction and Cardiac and Vascular Structural

Anna Rebeka Oliveira Ferreira1, Maiara Vanusa Guedes Ribeiro1, Maria Natalia Chimirri Peres1

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Dietary protein restriction during peri-puberty causes long-term hypertension and sympathetic nervous system imbalance in male rats. This nutritional insult also leads to cardiac structural changes and altered brain redox state, impacting cardiovascular health later in life.

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autonomic nervous systemdevelopmental origins of health and diseasehypertensionlow protein dietperi-puberty

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Area of Science:

  • Cardiovascular Physiology
  • Nutritional Science
  • Developmental Biology
  • Autonomic Nervous System Research

Background:

  • Nutritional deficits during critical developmental periods can program offspring for later-life diseases, including cardiovascular conditions.
  • The impact of peri-pubertal dietary protein restriction on long-term autonomic nervous system function and hypertension development remains incompletely understood.

Purpose of the Study:

  • To investigate if autonomic nervous system (ANS) imbalance underlies the sustained hypertension induced by dietary protein restriction during the peri-pubertal phase.
  • To evaluate the long-term cardiovascular and autonomic consequences of peri-pubertal low protein (LP) diet in male Wistar rats.

Main Methods:

  • Male Wistar rats were fed either a low protein (4%) or control (20.5%) diet from postnatal day 30 to 60.
  • Following the dietary intervention, all rats were returned to a normal protein diet until cardiovascular and autonomic function assessment at postnatal day 120.
  • Measurements included mean arterial pressure, spectral analysis of arterial pressure variability, autonomic blockade, cardiac structure, and redox state markers in the heart and brainstem.

Main Results:

  • LP rats exhibited significantly increased mean arterial pressure and sympathetic arousal, evidenced by altered arterial pressure spectral analysis and increased response to ganglion blockade.
  • Cardiac alterations included ventricular hypertrophy and increased interstitial fibrosis in LP rats.
  • Reduced protein carbonyls and catalase activity were observed in the hearts of LP rats, alongside altered redox status in the brainstem.

Conclusions:

  • Dietary protein restriction during the peri-pubertal period induces long-term hypertension and sustained sympathetic overactivity in male rats.
  • These hypertensive effects are associated with structural cardiac changes and a disorganized redox state in both the brain and the heart.
  • The findings suggest a critical role for peri-pubertal nutrition in programming long-term cardiovascular health via autonomic and redox mechanisms.