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Expression of hLAMP-1-Positive Particles During Early Heart Development in the Chick
T H Abd-Elhamid1,2, M L Conway1, A R Sinning1
1Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA.
Insights
Heart lectin-associated matrix protein-1 (hLAMP-1) is crucial for early heart development. Its expression patterns in chick embryos suggest a role in endocardial tube formation during embryonic heart development.
Area of Science:
- Developmental Biology
- Cardiovascular Research
- Extracellular Matrix Biology
Background:
- Congenital heart defects arise from disruptions in heart development.
- Heart lectin-associated matrix protein-1 (hLAMP-1) is a matrix protein with known roles in chick heart development.
- Previous studies documented hLAMP-1's role in mesenchyme formation.
Purpose of the Study:
- To investigate the expression patterns of hLAMP-1 during early chick heart development (Hamburger-Hamilton stages 8-14).
- To elucidate the potential role of hLAMP-1 in the formation of the endocardial tube.
Main Methods:
- Immunohistochemistry using hLAMP-1 specific antibodies on chick embryo heart sections.
- Analysis of hLAMP-1 expression patterns across Hamburger-Hamilton stages 8-14.
Main Results:
- hLAMP-1 was detected in the extracellular matrix of pre-cardiac mesoderm, endoderm, ectoderm, and neuroectoderm at HH stages 8-9.
- Following heart tube formation (HH stage 10), hLAMP-1 expression shifted to the arterial and venous poles, excluding regions of dorsal mesocardium rupture.
- This expression pattern persisted until HH stage 14.
Conclusions:
- The dynamic expression of hLAMP-1 during early chick heart development suggests its involvement in crucial developmental processes.
- hLAMP-1's localization points to a potential role in the formation of the endocardial tube.
Abstract:
Heart development requires coordinated activity of various factors, the disturbance of which can lead to congenital heart defects. Heart lectin-associated matrix protein-1 (hLAMP-1) is a matrix protein expressed within Hensen's node at Hamburger-Hamilton (HH) stage 4, in the lateral mesoderm by HH stages 5-6 and enhanced within the left pre-cardiac field at HH stage 7. At HH stages 15-16, hLAMP-1 expression is observed in the atrioventricular canal and the outflow tract. Also, the role of hLAMP-1 in induction of mesenchyme formation in chick heart has been well documented. To further elucidate the role of this molecule in heart development, we examined its expression patterns during HH stages 8-14 in the chick. In this regard, we immunostained sections of the heart during HH stages 8-14 with antibodies specific to hLAMP-1. Our results showed prominent expression of hLAMP-1-positive particles in the extracellular matrix associated with the pre-cardiac mesoderm, the endoderm, ectoderm as well as neuroectoderm at HH stages 8-9. After formation of the linear heart tube at HH stage 10, the expression of hLAMP-1-stained particles disappears in those regions of original contact between the endoderm and heart forming fields due to rupture of the dorsal mesocardium while their expression becomes confined to the arterial and venous poles of the heart tube. This expression pattern is maintained until HH stage 14. This expression pattern suggests that hLAMP-1 may be involved in the formation of the endocardial tube.
