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A Scanning Electron Microscopic Study of the Contraction of Vascular Wall Cells in Dog Dental Pulp

Department of Oral Anatomy and Pedodontics, Faculty of Dentistry, Kyushu University 61, Fukuoka 812, Japan

J.Q. Zhang

Department of Oral Anatomy and Pedodontics, Faculty of Dentistry, Kyushu University 61, Fukuoka 812, Japan

T. Goto

Department of Oral Anatomy and Pedodontics, Faculty of Dentistry, Kyushu University 61, Fukuoka 812, Japan

T. Kondo

Department of Oral Anatomy and Pedodontics, Faculty of Dentistry, Kyushu University 61, Fukuoka 812, Japan

T. Tanaka

Department of Oral Anatomy and Pedodontics, Faculty of Dentistry, Kyushu University 61, Fukuoka 812, Japan

Ultrastructural changes in vascular wall cells in dog dental pulp after removal of connective tissue components were studied by scanning electron microscopy following administration of norepinephrine (0.2 mg/kg). Contracted smooth-muscle cells were frequently seen in arterioles of all sizes. The surfaces of these cells were highly irregular with numerous evaginations and invaginations, varying considerably in configuration and size. Many evaginations ran longitudinally or obliquely to the long axis of the vessel. Some meandering evaginations were also observed as, rarely, were small spherical or bulbous projections. Spidery smooth-muscle cells frequently seen in the tunica media of terminal arterioles and thought to be primitive smooth-muscle cells exhibited fewer irregularities than the typical spindle-shaped smooth-muscle cells beneath them. Pericytes in the larger post-capillary venules (20 µm or larger in diameter) often showed evaginations and invaginations, mainly running parallel to the vessel axis. On the other hand, no surface irregularities could be seen in pericytes of either the smaller post-capillary venules (less than 20 µm in diameter) or the capillaries, although occasional evaginations running parallel to the vessel axis were noted on the outer surface of the endothelium.

Journal of Dental Research, Vol. 70, No. 11, 1456-1461 (1991)
DOI: 10.1177/00220345910700111301


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