TY - JOUR
T1 - Dual sugar gut-permeability testing on blood drop in animal models
AU - Katouzian, Fourogh
AU - Sblattero, Daniele
AU - Not, Tarcisio
AU - Tommasini, Alberto
AU - Giusto, Elena
AU - Meiacco, Daniela
AU - Stebel, Marco
AU - Marzari, Roberto
AU - Fasano, Alessio
AU - Ventura, Alessandro
PY - 2005/2
Y1 - 2005/2
N2 - Intestinal permeability is determined by measuring nonmetabolized sugars. In animals, intestinal permeability is determined in urine, using cumbersome and expensive metabolic cages. We developed an HPLC method for determining concentrations of lactulose (L) and l-rhamnose (R) in blood-drop of rabbits and mice, and we compared these results with the procedure based on sugars excreted in urine. We measured the intestinal permeability induced by a fragment (ΔG) of the zonula occludens toxin which opens the paracellular pathway. The animals received sugar solution and later received the same solution+ΔG. Five-hour urine collection and timed blood tests were performed after ingestion of sugars. Sugars were measured with HPLC, and the percentage of recovered sugars was expressed as L/R ratio. At 60 min after administration of sugars, the mean L/R ratio for rabbits and mice was 0.026 and 0.052, respectively. At 60 min after administration of sugars+ΔG, the mean L/R ratio for rabbits and mice was 0.22 and 0.53. The mean L/R ratio in the urine was 0.023 at basal condition and 0.25 after ΔG ingestion. Testing small serum samples for sugar permeability is effective for monitoring changes in permeability of the gut in animals. This cheap simple method allows us to measure in vivo the biological activity of other molecules which modulate the paracellular pathway.
AB - Intestinal permeability is determined by measuring nonmetabolized sugars. In animals, intestinal permeability is determined in urine, using cumbersome and expensive metabolic cages. We developed an HPLC method for determining concentrations of lactulose (L) and l-rhamnose (R) in blood-drop of rabbits and mice, and we compared these results with the procedure based on sugars excreted in urine. We measured the intestinal permeability induced by a fragment (ΔG) of the zonula occludens toxin which opens the paracellular pathway. The animals received sugar solution and later received the same solution+ΔG. Five-hour urine collection and timed blood tests were performed after ingestion of sugars. Sugars were measured with HPLC, and the percentage of recovered sugars was expressed as L/R ratio. At 60 min after administration of sugars, the mean L/R ratio for rabbits and mice was 0.026 and 0.052, respectively. At 60 min after administration of sugars+ΔG, the mean L/R ratio for rabbits and mice was 0.22 and 0.53. The mean L/R ratio in the urine was 0.023 at basal condition and 0.25 after ΔG ingestion. Testing small serum samples for sugar permeability is effective for monitoring changes in permeability of the gut in animals. This cheap simple method allows us to measure in vivo the biological activity of other molecules which modulate the paracellular pathway.
KW - Blood-drop
KW - Intestinal permeability
KW - Lactulose
KW - Zonula occludens toxin-derived ΔG molecule
KW - l-rhamnose
UR - http://www.scopus.com/inward/record.url?scp=19944429643&partnerID=8YFLogxK
U2 - 10.1016/j.cccn.2004.09.023
DO - 10.1016/j.cccn.2004.09.023
M3 - Article
SN - 0009-8981
VL - 352
SP - 191
EP - 197
JO - Clinica Chimica Acta
JF - Clinica Chimica Acta
IS - 1-2
ER -