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Inhibition of tissue repair by spironolactone: Role of mineralocorticoids in fibrous tissue formation

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Abstract

Mineralocorticoids have been implicated in promoting fibrous tissue formation in various organs. In the present study, we sought to address the potential contribution of mineralocorticoids to fibrous tissue formation using a skin pouch model which has proved valuable for the analysis of inflammatory and wound healing responses. Skin pouches were induced in rats by administration of a phorbol ester, croton oil (0.5 ml of a 1% solution). After 2 weeks, rats were killed and intact pouch tissue collected. Pouch weights of control and aldosterone-treated (0.75 μg/h via osmotic minipump) rats were similar (3.33 ± 0.44 g vs. 3.70 ± 0.28 g respectively). However, pouch weights were reduced by more than 50% in spironolactone-treated (25 mg/day powdered in food) animals (1.62 ± 0.22 g and 1.27 ± 0.23 g respectively in aldosterone and spironolactone alone groups). To ascertain the effects of different treatments on collagen accumulation, hydroxyproline concentration was measured. Compared with controls, hydroxyproline concentration was significantly reduced following spironolactone treatment (17.1 ± 0.08 vs. 7.5 ± 2.0 μg/mg dry wt, respectively, p < 0.01). This response to spironolactone was negated by coadministration of aldosterone (hydroxyproline concentration was 18.6 ± 2.1 μg/mg dry wt). Following bilateral adrenalectomy, spironolactone reduced pouch weight and hydroxyproline concentration, which was not the case for adrenalectomy alone. Two week aldosterone administration in uninephrectomized rats on high salt diet was deemed ineffective in modulating pouch development (pouch wet wts were 3.48 ± 0.4 g vs. 3.00 ± 0.19 g in controls and aldosterone-treated rats, respectively). Mineralocorticoid receptor expression in pouch tissue was demonstrated by RT/PCR. Furthermore, NADP+-dependent 11β-hydroxysteroid dehydrogenase 1 (11β-HSD1) activity was detected in pouch tissue, together with lower levels of NAD+-dependent 11β-HSD2. Spironolactone (p < 0.05) significantly reduced 11β-HSD1 activity compared with controls. Thus, fibrous tissue possesses requisite components of MC action, and antagonism of mineralocorticoid receptors by spironolactone attenuates its formation. Pouch formation is under the influence of circulating MC and, we would like to propose, is also mediated through corticosteroids generated de novo at the site of tissue repair.

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Authors and Affiliations

  1. Department of Internal Medicine, University of Missouri Health Sciences Center, Columbia, Missouri, USA

    Simon H. Slight, Vijay K. Chilakamarri, Samar Nasr, Arvinder K. Dhalla, Felix J.A. Ramires, Yao Sun & Karl T. Weber

  2. Department of Veterinary Biomedical Sciences, University of Missouri Health Sciences Center, Columbia, Missouri, USA

    Venkataseshu K. Ganjam

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  1. Simon H. Slight
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  2. Vijay K. Chilakamarri
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  3. Samar Nasr
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  4. Arvinder K. Dhalla
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  5. Felix J.A. Ramires
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  6. Yao Sun
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  7. Venkataseshu K. Ganjam
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  8. Karl T. Weber
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Slight, S.H., Chilakamarri, V.K., Nasr, S. et al. Inhibition of tissue repair by spironolactone: Role of mineralocorticoids in fibrous tissue formation. Mol Cell Biochem 189, 47–54 (1998). https://doi.org/10.1023/A:1006844010371

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