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Rabbit model simulating transient hyperglycinemia following transurethral prostatectomy.

P Gentens1, P P De Deyn, R D'Hooge

  • 1Department of Urology, University of Antwerp (U.I.A.), Antwerp, Belgium.

Amino Acids
|November 2, 2013
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Summary
This summary is machine-generated.

Intravenous glycine injection in rabbits caused dose-dependent hyperglycinemia, reaching levels seen in transurethral prostatectomy patients. This elevated glycine significantly distributed into the central nervous system, suggesting a link to TURP-related complications.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pharmacology

Background:

  • Transurethral prostatectomy (TURP) can lead to neurological complications, including visual disturbances, collectively known as TURP syndrome.
  • The role of glycine, an inhibitory neurotransmitter, in these complications is not fully understood.
  • Hyperglycinemia, elevated glycine levels in the blood, is a potential factor.

Purpose of the Study:

  • To investigate the distribution of systemically administered glycine into the central nervous system and ocular tissues in a rabbit model.
  • To determine if glycine levels achieved during experimental hyperglycinemia are comparable to those observed in patients undergoing TURP.
  • To assess the potential link between hyperglycinemia and the neurological and visual side effects associated with TURP.

Main Methods:

  • Intravenous injection of glycine in rabbits at varying doses.
  • Measurement of plasma glycine concentrations.
  • Analysis of glycine levels in cerebrospinal fluid, retina, vitreous humor, and anterior chamber fluid at different time points post-injection.
  • Comparison of experimental glycine levels with reported levels in TURP patients.

Main Results:

  • Glycine injection resulted in dose-dependent hyperglycinemia, with 10mmol/kg achieving plasma levels (10-16mM) similar to those in TURP patients.
  • A tenfold increase in glycine was observed in cerebrospinal fluid within 10 minutes.
  • Significant elevations of glycine were noted in ocular tissues (retina, vitreous humor) and cerebral structures within 10-30 minutes post-injection.

Conclusions:

  • Experimental hyperglycinemia leads to substantial glycine accumulation in the central nervous system and ocular compartments.
  • These findings support the hypothesis that elevated glycine levels contribute to the pathogenesis of visual disturbances and other neurological complications observed in TURP syndrome.
  • The study provides evidence linking glycine's neuroactivity to TURP-related adverse effects.