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Membrane-type 4 matrix metalloproteinase (MT4-MMP) modulates water homeostasis in mice

Manakan B Srichai1, Heloisa Colleta, Leslie Gewin

  • 1Department of Medicine, Veterans Administration Hospital, Nashville, Tennessee, United States of America.

Plos One
|February 25, 2011
PubMed

Insights

Matrix metalloproteinase 4 (MT4-MMP) is not crucial for kidney development or function. However, MT4-MMP influences neural pathways that regulate thirst, leading to reduced water intake in null mice.

Area of Science:

  • Biochemistry
  • Physiology
  • Developmental Biology

Background:

  • Matrix metalloproteinases (MMPs) are enzymes involved in extracellular matrix degradation.
  • Membrane-type MMPs (MT-MMPs), including MT4-MMP, play roles in various physiological processes.
  • The specific in vivo functions and substrates of GPI-anchored MT-MMPs like MT4-MMP remain largely unknown.

Purpose of the Study:

  • To investigate the role of MT4-MMP in kidney development and function.
  • To explore the physiological functions of MT4-MMP in vivo.
  • To determine the impact of MT4-MMP deficiency on renal and thirst regulation.

Main Methods:

  • Analysis of MT4-MMP expression patterns in developing and adult kidneys.
  • Phenotypic characterization of MT4-MMP null mice, including renal morphology and function assessments.
  • Evaluation of urine concentration/dilution capacity, water intake, and urine output in wild-type and null mice.
  • Examination of MT4-MMP expression in hypothalamic regions relevant to thirst regulation.

Main Results:

  • MT4-MMP is expressed in the developing and adult kidney, with highest levels in the papilla.
  • MT4-MMP null mice exhibited minor kidney developmental defects and slightly dysmorphic collecting ducts.
  • While renal concentrating and diluting abilities were normal, MT4-MMP null mice showed reduced water intake and urine output (hypodipsia).
  • MT4-MMP expression was detected in hypothalamic areas involved in thirst regulation.

Conclusions:

  • MT4-MMP is dispensable for major kidney development and function.
  • MT4-MMP appears to modulate neural stimuli that regulate thirst, potentially through its expression in the hypothalamus.
  • The study identifies a novel role for MT4-MMP in the neuro-endocrine regulation of water balance.

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