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Biomedical subjects

J Perry

Publications and source records attributed to J Perry.

At least 289 records · Page 16Linked to original sources
PubMed1973

Formylation of folate as step in physiological folate absorption.

Oral administration of folate analogues to rats is followed by a rise in plasma folate detectable only by micro-biological assay with Lactobacillus casei, suggesting methylation of folate during absorption. When using the everted rat gut technique with folate (PteGlu), dihydrofolate (H(2)PteGlu), or tetrahydrofolate (H(4)PteGlu) on the mucosal surface formyl folate (10-CHO-PteGlu, 10-CHO-H(4)PteGlu, 5-CHO-H(4)PteGlu) and methylfolate (5-CH(3)-H(4)PteGlu) are recovered from the serosal fluid. This indicates that absorption of PteGlu is followed by formylation and that the formyl group is further reduced to methyl, 5-CH(3)-H(4)PteGlu passing on to portal blood.

Animals↗
PubMed1972

Observations on folate absorption with particular reference to folate polyglutamate and possible inhibitors to its absorption.

A test system for detection of inhibitors to the enzyme which removes the glutamic acid peptide chain from folate polyglutamates (folate conjugase) is described. This utilizes the reaction between plasma conjugase and the folate polyglutamate in red blood cell haemolysate. Diphenylhydantoin and yeast extracts did not inhibit plasma conjugase. The better absorption of monoglutamate forms of folate as compared to polyglutamate forms was confirmed. Polyglutamates were absorbed normally by patients with pernicious anaemia, suggesting that conjugase enzymes (optimally active at pH 4.5) did not normally function to a significant extent in the gut lumen. Diphenylhydantoin and bicarbonate did not interfere with absorption of either mono- or polyglutamate forms of folate.

Anemia, Pernicious↗
PubMed1972

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