Abstract：
:The aim of the study was to evaluate the distribution of apoptosis in the medullary nuclei of infants and adults who died of hypoxic-ischaemic injury. Apoptosis was studied by terminal deoxynucleotidyl transferase-mediated dUTP nick end-labelling (TUNEL) in brainstems from 22 adults (7 subjects who died of opiate intoxication, 15 who died of other hypoxic-ischaemic injury) and 10 infants. The nuclei examined included the hypoglossal, dorsal motor nucleus of the vagus, nucleus tractus solitarii, nucleus of the spinal trigeminal tract, cuneate, vestibular and inferior olivary nuclei. A morphometric analysis with the optical disector method was performed to calculate the mean percentages (+/- standard deviation) of TUNEL-positive neuronal and glial cells for the sample populations. Opiate deaths did not have higher apoptotic indices than other adult hypoxic-ischaemic deaths. Statistically significant differences between adults and infants were found in the neuronal apoptotic indices of the cuneate (28.2 +/- 16.3% vs. 6.9 +/- 8.7%), vestibular (24.7 +/- 15.0% vs. 11.3 +/- 11.4%), nucleus tractus solitarii (11.2 +/- 11.2% vs. 2.3 +/- 2.4%), dorsal motor nucleus of the vagus (6.8 +/- 8.5% vs. 0.1 +/- 0.2%) and hypoglossal (6.6 +/- 5.7% vs. 0.1 +/- 0.2%), indicating higher resistance of the neuronal populations of these infant medullary nuclei to terminal hypoxic-ischaemic injury or post-mortem changes. Differences in neuronal apoptotic index were also statistically significant among nuclei, suggesting differential characteristics of survival. Nuclei with higher neuronal apoptotic indices were the cuneate, vestibular and nucleus of the spinal trigeminal tract, which are located in the lateral medullary tegmentum and share the same vascular supply from the posterior inferior cerebellar artery.
journal_name
J Anatjournal_title
Journal of anatomyauthors
Porzionato A,Macchi V,Guidolin D,Sarasin G,Parenti A,De Caro Rdoi
10.1111/j.1469-7580.2007.00842.xsubject
Has Abstractpub_date
2008-02-01 00:00:00pages
106-13issue
2eissn
0021-8782issn
1469-7580pii
JOA842journal_volume
212pub_type
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