Changes in the Expression of Calbindin and Calretinin in Interneurons of the Spinal Dorsal Horns Under Conditions of Antiorthostatic Suspension in Mice

In female C57Bl/6 mice subjected to antiorthostatic suspension of the hind limbs for 30 days, calbindin- and calretinin-containing interneurons of the dorsal horns of the upper thoracic segments of the spinal cord were studied using immunohistochemical methods. In mice of the experimental group, cross-sectional area of calbindin- and calretinin-containing interneurons decreased in laminae I, II, and III and increased in laminae IV and V and in the region of the medial edge of the dorsal horn. After antiorthostatic suspension, expression of calretinin decreased in interneurons of laminae I and II and calbindin expression increased in the interneurons of laminae III, IV, and V. The total number of interneurons in laminae of the spinal cord detected by Nissl staining in the control and experimental groups remained unchanged. After antiorthostatic suspension and in control group, number of interneurons immunoreactive for calbindin and calretinin was maximum in lamina II and minimum in laminae IV and V and in the region of the medial edge of the spinal dorsal horn.

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