Ear Res Jpn Morphological Sutudy of the Effect of acute Hypertension and Hypotension on the Permeability of Blood Vessels of vestibular Organs

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1 Ear Res Jpn Morphological Sutudy of the Effect of acute Hypertension and Hypotension on the Permeability of Blood Vessels of vestibular Organs M.Sakagami*, M.Sano**, T.Harada**, T.Matsunaga**, T.Kubo* and S.Sakai* *Department of Otolaryngology, Kagawa Medical College **Department of Otolaryngology, Osaka University Medical School The effect of acute hypertension and hypotension on blood vessels of the vestibular organs were studied electron microscopically with the tracer method of horseradish peroxidase(hrp). Acute hypertension was induced by i.v. infusion of methoxamine chloride(mexan), and acute hypotension by i.v. infusion of trimetaphan camsilate(arfonad). In both acute hyper- and hypotensive experiments, there was no extravasation of HRP from capillaries in sacculus, utriculus and semicircular canals, despite the presence of some labelled pinocytotic vesicles. The endothelial cells were intact, and no HRP penetration occured through endothelial tight junctions. These findings suggest that the capillary of the vestibularorgans is of the ordinary brain capillary type. And, moreover, comparison between capillary permeability of vestibular organs and that of cochlea will be discussed.

2 5) Sakagami M, Sano M, Tamaki H and Matsunaga T: Increased capillary permeability of the stria vascularis to HRP, induced by experimental acute hypotension in rats. Acta Otolaryngol (Stockh) 98: 53-60, ) Wstergaard E, Van Deurs B and Brondsted ME: In- vesicular transfer of horseradish peroxidase creased across cerebral endothelium, evoked by acute hypertension. Acta Neuropath (Berl) 37: , ) Nagy Z, Mathieson G and Huttner I: Blood-brain barrier opening to horseradish peroxidase on acute hypertension. Acta Neuropath (Berl) 48: 45-53, Figure Legends Fig. 1. The arterial mean blood pressure (MBP) is monitored from the left femoral artery during experiments and mesured in mmhg. (a) The diagram shows an acute hypertensive experiment of the infusion of Mexan. The blood pressure under non-experimental conditions was stable, and then intravenous infusion of Mexan (M) resulted in abrupt rise in MBP. HRP mark indicates i.v. injection of the tracer. Five minutes later, vascular perfusion (Fix) was started. (b) An hypotensive experiment of the infusion of Arfonad. Infusion of Arfonad (A) resulted in decrease in blood pressure. Fig Microscopic demonstration of benzidine reaction after intravenous infusion of tracer. The reaction product in vascular lumen is often washed out by the perfused fixatives. Fig. 2. Light micrograph of cross sections, 2ƒÊm thick of saccculus (no stain). (a) control group. X48 (b) acute hypertensive group. X51 (c) acute hypotensive group. X52 Fig. 3. Light micrographs of cross sections of utriculus 3) Sakagami M, Matsunaga T and Hashimoto PH: Fine structure and permeability of capillaries in the stria vascularis and spiral ligament of the inner ear of the guinea pig. Cell tissue Res 226: , ) Sakagami M. Sano M and Matsunaga T: Ultrastructural study of the effect of acute hypertension on the stria vascularis and spiral ligament. Acta Otolaryngol (Stockh) 97: 57-61, (no stain). (a) control group. X55 (b) acute hypertensive froup. X26 (c) acute hypotensive group. X32 Fig. 4. Light micrographs semicircular canals (no stain). (a) control group. X46 (b) acute hypertensive of cross sections of ampullae of group. X50

3 Ear Res Jpn (c) acute hypotensive group. X32 Fig. 5. Electron micrograph of capillaries beneath sensory epithelial cells of the semicircular canal in control experiment. No reaction product was found in the perivasular space. Hl, hair cell type 1; SC, supporting cell; L, capillary lumen. X2,200 Fig. 6. Higher magnification of part of capillary wall of the semicircular canal in the acute hypertensive experiment. The tracer is attached to the luminal surface of the endothelium (e) and is seen in some pinocytotic vesicles. However, the perivascular basement membrane (bin) is unstained with HRP. Interendothelial cleft dose not contain the reaction product. Arrowheads indicate fusions of tight junctions. L, capillary lumen, X38,500. Fig. 7. Capillary under sensory epithelial cells of the utriculus in the acute hypertensive experiment. No reaction product is observed in the perivascular space. Hl, hair cell type 1; H2, hair cell type 2; SC, supporting cell; L, capillary lumen. X3,200. Fig. 8. Capillary beneath sensory epithelial cells of the sacculus in the acute hypotensive experiment. HRP cannot be detected outside the capillary lumen (L). Hl, hair cell type 1; H2, hair cell type 2; SC, supporting cell. X2,200. Fig. 1

4 Ear Res Jpn Table Table 1 MBP = mean blood 2 MBP pressure 2a 3a 2b 3b 2c 3c 4a 4b 4c = mean blood pressure

5 Ear Res Jpn

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