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Related Experiment Videos

Maturational changes in rabbit renal cortical phospholipase A2 activity

J N Sheu1, M Baum, E W Harkins

  • 1Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, USA.

Kidney International
|July 1, 1997
PubMed
Summary

Neonatal kidneys show a reduced response to parathyroid hormone (PTH) due to lower phospholipase A2 (PLA2) activity. This diminished PLA2 activity in neonates, potentially linked to higher annexin 1 levels, explains the blunted response to PTH.

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Area of Science:

  • Nephrology
  • Biochemistry
  • Developmental Biology

Background:

  • Neonatal kidneys exhibit a significantly attenuated response to parathyroid hormone (PTH).
  • The underlying mechanisms for this blunted response in neonates remain largely unknown.
  • Adult proximal tubules show PTH-stimulated phospholipase A2 (PLA2) activity, which is linked to Na,K-ATPase inhibition.

Purpose of the Study:

  • To investigate maturational changes in renal cortical activity contributing to the attenuated neonatal response to PTH.
  • To compare phospholipase A2 (PLA2) activity and regulation between neonatal and adult proximal tubules.
  • To determine the role of annexin 1 in regulating PLA2 activity in the neonatal kidney.

Main Methods:

  • Assessed cytosolic and microsomal phospholipase A2 (PLA2) activity in neonatal and adult renal cortical suspensions using 14C-arachidonic acid release.

Related Experiment Videos

  • Quantified cPLA2 protein abundance via immunoblot assay.
  • Measured PLA2 activation by PTH, 8-bromo-cAMP, and PMA in proximal tubule suspensions using 3H-arachidonic acid release.
  • Determined annexin 1 protein abundance in neonatal and adult renal cortex.

    • Main Results:

    • Neonatal renal cortical cytosolic and microsomal PLA2 activities were significantly lower than in adults.
    • cPLA2 protein abundance was similar in neonatal and adult renal cortex, suggesting regulatory differences.
    • Annexin 1 protein abundance was significantly higher in neonatal renal cortex compared to adults.
    • PTH, 8-bromo-cAMP, and PMA failed to stimulate PLA2 activity in neonatal proximal tubules, unlike in adult tubules.

    Conclusions:

    • Lower renal cortical PLA2 activity in neonates, potentially due to higher annexin 1 expression, contributes to the blunted response to PTH.
    • Maturational changes in PLA2 regulation play a critical role in the attenuated neonatal kidney response to parathyroid hormone.
    • Neonatal proximal tubules possess functional PTH receptors but exhibit impaired downstream signaling via PLA2 activation.