The ultrastructural study of human cochlear nerve at different ages

被引:4
作者
Kumar, Punit [1 ]
Sharma, Saroj [2 ]
Kaur, Charanjeet [3 ]
Pal, Indra [4 ]
Bhardwaj, Daya Nand [5 ]
Vanamail, Perumal [6 ]
Roy, Tara Sankar [7 ]
Jacob, Tony George [1 ]
机构
[1] All India Inst Med Sci, Dept Anat, New Delhi 110029, India
[2] Dr Baba Saheb Ambedkar Med Coll & Hosp, Dept Anat, Delhi, India
[3] Massachusetts Eye & Ear, Dept Otolaryngol Head & Neck Surg, Boston, MA USA
[4] Univ Pittsburgh, Sch Med, Dept Neurobiol, Pittsburgh, PA USA
[5] All India Inst Med Sci, Dept Forens Med & Toxicol, New Delhi, India
[6] All India Inst Med Sci, Dept Obstet & Gynaecol, New Delhi, India
[7] North DMC Med Coll & Hindu Rao Hosp, Dept Anat, New Delhi, India
关键词
Aging; Axon; Myelin; Cluster analysis; Stereology; G-ratio; SURAL NERVE; FIBERS; MYELIN; NEUROFILAMENTS; CONDUCTION; TRANSPORT; CELLS; RATS;
D O I
10.1016/j.heares.2022.108443
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
Ultrastructural and molecular changes in the myelin of the cochlear nerve (CN) have been associated with decreased hearing-acuity with increasing age. But most of these are animal studies or with very few human samples. Hence, we studied the ultrastructure of the human CN at different ages. We obtained samples of CN from persons, who at the time of death belonged to young, middle or old age-groups; defined as <= 30, 31 to 50, and >= 51 years of age, respectively. These were processed for viewing under a transmission electron microscope (TEM). Morphology and morphometry were assessed after blinding the observer. Measurements of diameter (whole nerve fibre, axon), myelin thickness and calculation of G-ratio were made on calibrated images using ImageJ software. K-Means cluster analysis was performed based on total and inner nerve fibre area. Middle and old age CN showed degenerating axons, splitting of myelin sheath and myelin balloons. Between the middle and old age groups there was significant decrease in axon diameter (p < 0.001), inner nerve fibre area (p < 0.001), myelin thickness (p < 0.001), nerve fibre diameter (p < 0.001), and G ratio (p < 0.001). By clustering, we identified three distinct populations of myelinated nerve fibres: large, medium and small. The large fibres (by size), seen in the young, disappeared in the old age-group. We were unable to find any unmyelinated nerve fibres in this study. The morphological deterioration CN fibres may be a visible sign of molecular degeneration and contribute to decreased hearing-acuity. (C) 2022 Elsevier B.V. All rights reserved.
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页数:9
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