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Pre-pubertal induction of experimental diabetes protects against early renal macrophage infiltration

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Abstract

The present study was undertaken to identify whether the age at induction of experimental diabetes modifies macrophage infiltration in the kidney. Renal macrophage infiltration was studied 10 days after the induction of experimental diabetes in 4-week-old pre-pubertal and 12-week-old adult male rats of normotensive [Wistar-Kyoto (WKY) rats] and hypertensive (spontaneously hypertensive rats, SHRs) background. Renal macrophage infiltration was evaluated by immunohistochemistry for ED1. Plasma glucose levels were similar in all diabetic groups. Adult SHRs were hypertensive, and induction of diabetes did not alter blood pressure (BP) in any group. Induction of diabetes in pre-pubertal rats did not induce macrophage infiltration in the kidney. However, in adult rats, tubulointerstitial macrophage infiltration was increased in both WKY (22.86 ± 3.93 vs 7.86 ± 2.16 per high-power field, P < 0.001) and SHR (26.41 ± 5.91 vs 11.48 ± 1.23, P < 0.001) groups after induction of diabetes. Glomerular macrophage infiltration was also increased after induction of diabetes in the adult WKY group (1.83 ± 0.50 vs 1.16 ± 0.26 per glomerular cross section, P = 0.029), which was not significant in the adult SHRs (2.52 ± 0.34 vs 1.95 ± 0.35). We conclude that the pre-pubertal induction of diabetes apparently protects against early renal macrophage infiltration, while the induction of diabetes in adults induces exaggerated macrophage infiltration in the kidney.

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Acknowledgments

We thank Dr. Jacqueline M. Lopes de Faria and Dr. Roberto Amazonas for helpful suggestions. We are grateful to Sergio Magalhaes for technical assistance. We also thank Ms Denise S. Souza, Ms Kamila C. Silva, Ms Camila C. Pinto, Ms Vanessa C. Pansiera, Ms Daniela R. Melo, Mr. Leonardo D. Lobo and Mr. Bruno S. Pessoa for assistance in laboratory procedures. This work was supported by grants from Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq). Dr. Subrata Biswas was on receipt of a scholarship from CAPES.

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  1. Renal Pathophysiology Laboratory, Division of Nephrology, Department of Internal Medicine, Faculty of Medical Sciences, State University of Campinas (UNICAMP), 13084-971, Campinas, Sao Paulo, Brazil

    Subrata K. Biswas & Jose B. Lopes de Faria

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  1. Subrata K. Biswas
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  2. Jose B. Lopes de Faria
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Correspondence to Jose B. Lopes de Faria.

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Biswas, S.K., Lopes de Faria, J.B. Pre-pubertal induction of experimental diabetes protects against early renal macrophage infiltration. Pediatr Nephrol 22, 1045–1049 (2007). https://doi.org/10.1007/s00467-007-0453-y

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  • DOI: https://doi.org/10.1007/s00467-007-0453-y

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