Abstract
The intrinsic innervation of the developing gut has long been a subject of investigation, but little is known regarding that of the embryonic cloaca. The cloaca, like the rest of the gastrointestinal tract, is intrinsically innervated by the enteric nervous system. Nitrergic neurons and fibres make up a large part of this system, thus, their distribution provides us with a useful insight into its development. Cloacal and colorectal tissue specimens were removed from chick embryos at embryonic days 11 (E11), E15 and E19. NADPH-diaphorase (NADPH-d) histochemistry was carried out using whole mount tissue preparations. Ganglia density, the number of NADPH-d-positive cells per ganglia in the myenteric plexus and cell size were calculated and statistical analysis was performed to compare both regions of the gut (P<0.001). There were significant differences in the ganglia density in the cloaca compared to the colorectum at E11 (P<0.05) and E15 (P<0.01), with the colorectum having a much denser network. In both the cloaca and the colorectum, ganglia density significantly decreased with age (P<0.001), while significant differences were observed in the number of NADPH-d-positive cells per ganglia in both regions through development. Total cell size was similar in both the cloaca and colorectum at each stage and increased in both regions through development, predominantly due to an increase in the cytoplasm. Results reveal striking differences in innervation between the chick embryo cloaca and colorectum. The sparse network of innervation evident within the cloaca in contrast to the dense network within the colorectum emphasizes the individuality of both regions. These results highlight the need for a further in-depth analysis of the enteric nervous system’s development within the embryonic cloaca.
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References
Puri P, Shinkai T (2004) Pathogenesis of Hirschsprung’s disease and its variants: recent progress. Semin Pediatr Surg 13(1):18–24
Le Douarin NM, Kalcheim C (1999) The neural crest. University Press, Cambridge
Bredt DS, Hwang PM, Synder SH (1990) Localisation of nitric oxide synthase indicating a neural role for nitric oxide. Nature 374:768–770
Hope BT, Michael GJ, Knigge KM, Vincent SR (1991) Neuronal NADPH diaphorase is a nitric oxide synthase. Proc Natl Acad Sci USA 88:2811–2814
Balaskas C, Saffrey MJ, Burnstock G (1995) Distribution of NADPH-diaphorase activity in the embryonic chicken gut. Anat Embryol 192:239–245
Kay R, Tank ES (1977) Principles of management of the persistent cloaca in the female newborn. J Urol 117(1):102–104
Warne SA, Wilcox DT, Ransley PG (2002) Long-term urological outcome of patients presenting with persistent cloaca. P J Urol 68(4 Pt 2):1859–62
Balaskas C, Saffrey MJ, Burnstock G (1995) Distribution and colocalization of NADPH-diaphorase activity, nitric oxide synthase immunoreactivity, and VIP immunoreactivity in the newly hatched chicken gut. Anat Rec 243 (1):10–18
Bagyanszki M, Roman V, Fekete E (2000) Quantitative distribution of NADPH-diaphorase-positive myenteric neurons in different segments of the developing chicken small intestine and colon. Hist J 32:679–674
Tay D, Diao YC, Xiao YM, So KF (2002) Postnatal development of nicotinamide adenine dinucleotide phosphate-diaphorase-positive neurons in the retina of the golden hamster. J Comp Neurol 446:342–348
Phillips RJ, Kieffer EJ, Powley TL (2003)Aging of the myenteric plexus: neuronal loss is specific to cholinergic neurons. Auton Neurosci 106:69–83
Pirker ME, Montedonico S, Rolle U, Austvoll H, Puri P (2005) Regional differences in nitrergic neuronal density in the developing porcine urinary bladder. Pediatr Surg Int 21:161–168
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Donnell, A.O., Bannigan, J. & Puri, P. Differences in nitrergic innervation of the developing chick cloaca and colorectum. Ped Surgery Int 22, 90–94 (2006). https://doi.org/10.1007/s00383-005-1590-7
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DOI: https://doi.org/10.1007/s00383-005-1590-7