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Updated: Mar 26, 2026
Heart Dissection in Larval, Juvenile and Adult Zebrafish, Danio rerio
Published on: September 30, 2011
Vitamin D receptor signaling is required for heart development in zebrafish embryo
1Biology Department, Texas A&M University, College Station, TX77843-3258, United States; Biology Department, Princess Nourah University, Riyadh 11671, Saudi Arabia.
Abstract:
Vitamin D has been found to be associated with cardiovascular diseases. However, the role of vitamin D in heart development during embryonic period is largely unknown. Vitamin D induces its genomic effects through its nuclear receptor, the vitamin D receptor (VDR). The present study investigated the role of VDR on heart development by antisense-mediated knockdown approaches in zebrafish model system. In zebrafish embryos, two distinct VDR genes (vdra and vdrb) have been identified. Knockdown of vdra has little effect on heart development, whereas disrupting vdrb gene causes various cardiac phenotypes, characterized by pericardial edema, slower heart rate and laterality defects. Depletion of both vdra and vdrb (vdra/b) produce additive, but not synergistic effects. To determine whether atrioventricular (AV) cardiomyocytes are properly organized in these embryos, the expression of bmp4, which marks the developing AV boundary at 48 h post-fertilization, was examined. Notably, vdra/b-deficient embryos display ectopic expression of bmp4 towards the ventricle or throughout atrial and ventricular chambers. Taken together, these results suggest that VDR signaling plays an essential role in heart development.
Insights
The vitamin D receptor (VDR) is crucial for embryonic heart development. Disrupting VDR signaling in zebrafish embryos leads to cardiac defects, highlighting VDR
Area of Science:
- Developmental Biology
- Cardiovascular Research
- Endocrinology
Background:
- Vitamin D is linked to cardiovascular diseases.
- The specific role of vitamin D in embryonic heart development remains unclear.
- Vitamin D exerts genomic effects via the vitamin D receptor (VDR).
Purpose of the Study:
- To investigate the function of VDR in embryonic heart development.
- To elucidate the roles of the two zebrafish VDR genes (vdra and vdrb) in cardiac formation.
Main Methods:
- Utilized antisense-mediated knockdown in zebrafish embryos.
- Examined cardiac phenotypes including pericardial edema, heart rate, and laterality.
- Assessed the expression of bmp4 to evaluate atrioventricular (AV) boundary organization.
Main Results:
- Knockdown of vdra had minimal impact on heart development.
- Disruption of vdrb resulted in significant cardiac defects (edema, bradycardia, laterality issues).
- Combined vdra/b depletion showed additive cardiac defects, with ectopic bmp4 expression observed in deficient embryos.
Conclusions:
- VDR signaling is essential for normal embryonic heart development.
- VDRB plays a more critical role than VDRA in zebrafish cardiac formation.
- VDR signaling influences the proper organization of atrioventricular cardiomyocytes.
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