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Morphofunctional parameters of rat somatotrophes after acute and repeated immobilization or restraint stress. | LitMetric

Morphofunctional parameters of rat somatotrophes after acute and repeated immobilization or restraint stress.

Acta Histochem

University of Belgrade, Faculty of Biology, Institute for Physiology and Biochemistry, Department for Comparative Physiology and Ecophysiology, Studentski trg 16, 11000 Belgrade, Serbia.

Published: January 2019

AI Article Synopsis

Article Abstract

It is well known that stress changes levels of pituitary hormones in the bloodstream and in the pituitary itself. However, almost nothing is known about the impact of stress on histological and stereological parameters of the growth hormone producing cells (somatotrophs-GH cells). The aim of the present study was to investigate the effect of: acute and repeated immobilization; acute and repeated restraint on histological and morphofunctional parameters of somatotrophs in adult Wistar rats. Changes in the pituitary gland volume; the volume density and volume of somatotrophs following acute and repeated immobilization (IMO, R-IMO); acute and repeated restraint (R, R-R) were evaluated using a stereological system (newCAST), while growth hormone level within pituitary was determined by Western blot. Our results demonstrated the decrease (p < 0.05) of the pituitary volume (17%, 19%) in the IMO and R groups, respectively, and the increase in the R-R group. The volume density of GH cells decreased (p < 0.05) in the R-IMO (7%), R (26%) and R-R (18%) group in comparison to the control value. The pituitary GH content was increased (p < 0.05) after the IMO (2-fold), R (2.5-fold) and R-R (2.1-fold) as compared to the control group. These results point out that acute and repeated immobilization and/or restraint lead not only to changes in GH hormone concentration, but also modify the morphological aspects of GH cells within the rat pituitary.

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http://dx.doi.org/10.1016/j.acthis.2018.10.003DOI Listing

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