Expression of laminin and fibronectin in renal dysplasia

Abstract

The pathogenesis of renal dysplasia is a matter of debate. Recent theories have conceptualized the role of extracellular matrix proteins in the genesis of renal dysplasia. During normal nephrogenesis, collagen type I and III and fibronectins are lost and laminin and syndecan appear once proper induction has occurred. Any deviation from the normal pattern is said to lead to dysplasia. In this study, the expressions of adhesive glycoproteins, laminin, and fibronectin were studied immunohistochemically in 25 autopsy cases of renal dysplasia and normal age-matehed control cases. These cases of renal dysplasia were categorized into 3 groups based on the period of gestation: 20 to 26 weeks, 17 to 33 weeks, and 34 to 40 weeks. The immunohistochemical findings were graded from 0 to 4+ based on the visual intensity. Chi-square analysis was used to calculate the difference in expressions of laminin and fibronectin in cases and controls as a whole and within and between age groups. Immunostaining for laminin in all age groups showed a significant difference in expression between dysplastic kidneys (less expression) and normal controls (greater expression). In the case of fibronectin expression, all but 1 group showed a significant difference, with dysplatic kidneys showing more and normal controls showing less expression. The inference derived is that laminin expression decreases and fibronectin expression increases in renal dysplasia compared with normal nephrogenesis.

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Correspondence to Nandita Kakkar.

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published online November 8, 2004

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Menon, S., Kakkar, N. & Radotra, B.D. Expression of laminin and fibronectin in renal dysplasia. Pediatric and Developmental Pathology 7, 568–576 (2004). https://doi.org/10.1007/BF02640911

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Key words

  • extracellular matrix proteins
  • fibronectin
  • laminin
  • multicystic dysplasia
  • nephrogenesis
  • renal dysplasia