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Related Concept Videos

Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
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Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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CFTR may modulate AQP9 functionality in preeclamptic placentas.

M Castro-Parodi1, L Levi, V Dietrich

  • 1Cátedra de Biología Celular, Departamento de Ciencias Biológicas, Facultad de Farmacia y Bioquímica. Universidad de Buenos Aires, Junín 956 1er piso, CP 1113 Buenos Aires, Argentina.

Placenta
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

Preeclampsia is linked to decreased cystic fibrosis transmembrane conductance regulator (CFTR) expression in the placenta, potentially explaining the reduced activity of AQP9, a key transport protein.

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Area of Science:

  • Obstetrics and Gynecology
  • Physiology
  • Molecular Biology

Background:

  • Preeclampsia (PE) is a pregnancy-specific hypertensive disorder with unclear causes.
  • Altered placental angiogenesis and vasculature in PE can impair syncytiotrophoblast (hST) transport functions.
  • Increased AQP9 protein in preeclamptic placentas shows reduced functionality, with regulatory mechanisms unknown.

Purpose of the Study:

  • To investigate CFTR expression and localization in hST from preeclamptic placentas.
  • To determine if CFTR alterations correlate with the observed lack of AQP9 activity in PE.
  • To explore the role of CFTR in regulating AQP9 functionality in the human placenta.

Main Methods:

  • Western Blot and immunohistochemistry to assess CFTR expression in normal and preeclamptic placentas.
  • Immunofluorescence to determine CFTR-AQP9 co-localization within the hST.
  • Water uptake experiments using placental explants treated with CFTR inhibitors.

Main Results:

  • CFTR expression was significantly decreased in preeclamptic placentas compared to normal controls.
  • Apical hST labeling for CFTR diminished in PE, losing co-localization with AQP9.
  • Inhibition of CFTR in normal placental explants reduced water uptake, mimicking PE conditions.

Conclusions:

  • CFTR expression is reduced in preeclampsia.
  • Decreased CFTR may be responsible for the impaired AQP9 activity observed in PE.
  • CFTR plays a crucial role in regulating placental AQP9 function and water transport.