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Updated: Jun 28, 2026
Echocardiographic Assessment of Cardiac Anatomy and Function in Adult Rats
Published on: December 13, 2019
Age-related changes in parvalbumin in the heart of female rats
Uraporn Vongvatcharanon1, Wandee Udomuksorn, Surapong Vongvatcharanon
1Department of Anatomy, Prince of Songkla University, Hat-Yai, Thailand. uraporn.v@psu.ac.th
Insights
Parvalbumin protein levels increase in female rat hearts from newborn to adult. This age-related increase in parvalbumin may support cardiac myocyte relaxation during postnatal development.
Area of Science:
- Cardiovascular Physiology
- Developmental Biology
- Molecular Cardiology
Background:
- Parvalbumin is a calcium-binding protein crucial for muscle relaxation.
- Understanding parvalbumin's role in cardiac development is essential for comprehending age-related functional changes.
Purpose of the Study:
- To investigate parvalbumin protein levels and localization during postnatal development in the female rat heart.
- To correlate these changes with age-related alterations in cardiac function.
Main Methods:
- Immunohistochemical localization of parvalbumin in rat heart tissue.
- Western blotting assay to quantify parvalbumin protein levels.
- Analysis of hearts from female Wistar rats at different postnatal ages (newborn, 3, 6, and 12 months).
Main Results:
- Parvalbumin was detected in all age groups.
- Newborn rat hearts showed lower parvalbumin levels and incomplete sarcoplasmic immunoreactivity.
- Hearts from 3- to 12-month-old rats exhibited strong, widespread parvalbumin immunoreactivity, with levels increasing with age.
Conclusions:
- Parvalbumin levels increase in the female rat heart during postnatal development.
- This increase is associated with enhanced cardiac myocyte relaxation, potentially supporting the heart's adaptation to growing workload.
Abstract:
Changes of parvalbumin protein levels and immunolocalisation during the postnatal development of the female rat heart were investigated in order to determine if they were correlated with age-related changes in cardiac function. Hearts from newborn, 3-month-old (young), 6-month-old (young adult) and 12-month-old (adult) female Wistar rats were processed for immunohistochemical localization of parvalbumin and for Western blotting assay. Parvalbumin was detected by both methods in all age groups from newborn to 12-month-old rats. In the newborn rat heart, parvalbumin immunoreactivity did not fully fill the sarcoplasm of the cardiac myocytes and the amount of parvalbumin was low compared to the adult levels. In contrast, in 3-12-month-old rats, strong parvalbumin immunoreactivity was detected throughout the sarcoplasm of all cardiac myocytes and the amount of parvalbumin increased with increasing age (from newborn to adult). Our study indicates that an increase of parvalbumin levels in the female rat heart with increasing age may be associated with maintenance of proper relaxation of the cardiac myocytes needed to cope with the increasing workload of the heart during postnatal growth.
