Abstract
Sympathetic nerve sprouting (SNS) has been shown to occur after myocardial infarction (MI) and heart failure (HF) and is known to be responsible for the development of lethal arrhythmias. During MI or HF intracardiac cells are exposed to increased mechanical stretch. Molecular mechanisms which trigger sympathetic neural growth are largely unknown. Therefore, this study aimed to investigate the impact of mechanical stretch on rat neonatal sympathetic neurocytes of the superior cervical ganglion (SCG). Mechanical stretch resulted in an increased growth of sympathetic neurocytes. Furthermore, we could demonstrate that SCG neurocytes express nerve growth factor (NGF), ciliary neurotrophic factor (CNTF), neurotrophin-3 (NT-3) and glial derived neurotrophic factor (GDNF) on mRNA and protein level. An increased NGF and CNTF expression, a down-regulated GDNF expression and an unchanged NT-3 expression were identified in the neurocyte cell culture supernatant of neurocytes exposed to mechanical stretch. However, neither brain derived neurotrophic factor (BDNF) mRNA and protein was expressed in SCG neurocytes, nor BDNF could be detected in the cell culture supernatant of SCG neurons. By anti-neurotrophin neutralizing experiments NGF and ...Continue Reading
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