Influx of glycyl-proline and free amino acids across intestinal brush border of phenobarbital-treated rats

In a previous study the authors have shown that treatment with phenobarbital in the rat is followed by a generalized increase of amino acid concentration in the plasma. In order to better clarify this phenomenon, the effect of phenobarbital on intestinal protein absorption was now studied by measuring the influxes of Glycyl-L-Proline, L-Phenylalanine, L-Lysine and L-Glutamic acid across the brush border of jejunum and ileum in rats treated with phenobarbital for two or four days. No significant changes of these influxes were observed in the treated animals as compared to the controls, hence suggesting that the effect of phenobarbital on plasma levels of free amino acids is not mediated by an effect on intestinal absorption. The rate of Glycyl-Proline influx as compared to those of amino acid influxes suggests the occurrence of a carrier-mediated transport process for this dipeptide in the rat intestine as previously shown in the rabbit.

[Physiology of transitory ischemic attacks in the vertebro-basilar region. I. Functional anatomy of the vertebro-basilar system]

Regions of supply by the posterior segment of the circle of Willis are discussed in terms of anatomo-functional organization.

[Physiopathology of ischemic transitory attacks in the vertebro-basilar region. II. Physiopathological and clinical aspects]

Hemodynamic and metabolic factors of regional cerebral blood flow regulation are analyzed, and pathophysiology and clinical aspects of transient ischemic attacks of vertebro-basilar system are discussed.

The management of portal hypertension in cystic fibrosis

We have found that with proper selection and preoperative preparation, a major portosystemic shunt can be done with considerable safety in a majority of cystic fibrosis patients and thus provide them with significant palliation and improved quality of life.