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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.1
- 수록면
- 133 - 139 (7page)
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초록· 키워드
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The ultrastructural parameters related to synaptic release of endings which are presynaptic to tooth pulp afferent terminals (p-endings) were analyzed to understand the underlying mechanism for presynaptic modulation of tooth pulp afferents.
Tooth pulp afferents were labelled by applying wheat-germ agglutinin conjugated horseradish peroxidase to the rat right lower incisor, whereafter electron microscopic morphometric analysis with serial section and reconstruction of p-endings in the trigeminal oral nucleus was performed. The results obtained from 15 p-endings presynaptic to 11 labeled tooth pulp afferent terminals were as follows.
P-endings contained pleomorphic vesicles and made symmetrical synaptic contacts with labeled terminals. The p-endings showed small synaptic release-related ultrastructural parameters: volume, 0.82 ± 0.45 μm3 (mean ± SD); surface area, 4.50 ± 1.76 μm2; mitochondrial volume, 0.15 ± 0.07 μm3; total apposed surface area, 0.69 ± 0.24 μm2; active zone area, 0.10 ± 0.04 μm2; total vesicle number, 1045 ± 668.86; and vesicle density, 1677 ± 684/μm2. The volume of the p-endings showed strong positive correlation with the following parameters: surface area (r=0.97, P<0.01), mitochondrial volume (r=0.56, P<0.05), and total vesicle number (r=0.73, P<0.05). However, the volume of p-endings did not positively correlate or was very weakly correlated with the apposed surface area (r=-0.12, P=0.675) and active zone area (r=0.46, P=0.084).
These results show that some synaptic release-related ultrastructural parameters of p-endings on the tooth pulp afferent terminals follow the “size principle” of Pierce and Mendell (1993) in the trigeminal nucleus oralis, but other parameters do not. Our findings may demonstrate a characteristic feature of synaptic release associated with p-endings.
목차
등록된 정보가 없습니다.
참고문헌 (35)
참고문헌 신청
Olszewski J / 1950 / On the anatomical and functional organization of the spinal trigeminal nucleus / J Comp Neurol 92:401~413
Yasui Y / 1983 / The posteromedial ventral nucleus of the thalamus (VPM) of the cat: direct ascending projections to the cytoarchitectonic subdivisions / J Comp Neurol 220:219~228
Tsuru K / 1989 / Central terminations of periodontal mechanoreceptive and tooth pulp afferents in the trigeminal principal and oral nuclei of the cat / Brain Res 485:29~61
Yoshida A / 1994 / Two major types of premotoneurons in the feline trigeminal nucleus oralis neurons as demonstrated by intracellular stianing with HRP / J Comp Neurol 347:495~514
Shigenaga Y / 1988 / Morphology of single mesencephalic trigeminal neurons innervating masseter muscle of the cat / Brain Res 445:392~399
Yasui Y / 1983 / The posteromedial ventral nucleus of the thalamus (VPM) of the cat: direct ascending projections to the cytoarchitectonic subdivisions / J Comp Neurol 220:219~228
Tsuru K / 1989 / Central terminations of periodontal mechanoreceptive and tooth pulp afferents in the trigeminal principal and oral nuclei of the cat / Brain Res 485:29~61
Yoshida A / 1994 / Two major types of premotoneurons in the feline trigeminal nucleus oralis neurons as demonstrated by intracellular stianing with HRP / J Comp Neurol 347:495~514
Shigenaga Y / 1988 / Morphology of single mesencephalic trigeminal neurons innervating masseter muscle of the cat / Brain Res 445:392~399
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