High-affinity folate receptor in cardiac neural crest migration: a gene knockdown model using siRNA

Area of Science:

• Developmental Biology
• Genetics
• Cardiovascular Science

Background:

• Folate supplementation is known to reduce congenital heart defects.
• The precise protective mechanisms of folate during embryonic development are not fully understood.
• High-affinity folate receptor 1 (FOLR1) is expressed in early developmental tissues.

Purpose of the Study:

• To investigate the role of FOLR1 in the development of cardiac neural crest (NC) cells.
• To elucidate the mechanism by which folate influences embryonic heart formation.
• To determine the impact of reduced FOLR1 expression on pharyngeal arch artery (PAA) and outflow tract development.

Main Methods:

• Immunolabeling was used to identify FOLR1 expression in neural tube and NC cells.
• Site-directed short-interfering RNA (siRNA) was employed to suppress Folr1 expression in cardiac NC cells.
• Quantitative PCR (qPCR) was utilized to confirm the reduction in Folr1 expression.
• Analysis of cell mitosis and migration patterns was performed.

Main Results:

• FOLR1 was predominantly found in neural tube and cardiac NC cells during early development.
• Suppression of Folr1 using siRNA significantly reduced Folr1 expression within 24 hours.
• Reduced Folr1 expression led to altered cardiac NC cell mitosis and migration.
• Abnormal development of the pharyngeal arch arteries (PAA) and outflow tract was observed.

Conclusions:

• FOLR1 plays a critical role in the proper development of cardiac NC cells.
• Transient suppression of FOLR1 during critical developmental stages has lasting effects on heart formation.
• This study highlights FOLR1 as a key factor in preventing congenital heart defects related to neural crest development.