Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.2.1.31 (beta-glucuronidase)
 7,680 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Breast-feeding is associated with jaundice in the early neonatal period. Previous work has shown levels of the enzyme beta-glucuronidase in maternal breast milk to be related to infant serum bilirubin on postnatal day 21. Our aim was to establish if there was a correlation between the level of breast milk beta-glucuronidase and the degree of early (first week) neonatal hyperbilirubinaemia. A study of 55 mother and baby pairs showed that breast milk beta-glucuronidase levels had no relationship with the level of infant serum bilirubin between postnatal days 3 and 6. Breast milk beta-glucuronidase does not directly account for the early neonatal jaundice seen in breast-fed babies.
 ...
PMID:Breast milk beta-glucuronidase and exaggerated jaundice in the early neonatal period. 161 Sep 52

Jaundice is the most common condition of otherwise healthy, full-term newborns during the first week of life, and Chinese newborns are known to have a higher incidence and severity of neonatal jaundice than Caucasian newborns. This prospective study was designed to examine factors affecting the severity of neonatal jaundice of unknown etiology in the first week of life with special emphasis on the role of enterohepatic circulation. One hundred and thirty-six healthy, full-term newborns were enrolled in this study. Serum bilirubin levels were monitored daily in the morning for the first five days after delivery. Cord blood, postpartal maternal blood, breast milk and infants' stools were analyzed for beta-glucuronidase activity. Infants with serum peak bilirubin level less than or equal to 7 mg/dl had older gestational age, less maximal weight loss and the bilirubin levels peaked at an earlier age than those infants with peak serum bilirubin level more than 7 mg/dl. They also had lower fecal beta-glucuronidase activity in the stool collected at a mean age of 4.5 (+/- 0.6) days. Among the 136 study cases, 92 infants received some maternal breast milk. There was considerable amount of beta-glucuronidase activity in the human breast milk. Yet its presence did not affect the fecal enzyme activity. Mixed breast feeding also did not influence the serum bilirubin level in the first four days of life. However, infants fed dominantly with breast milk had a higher incidence of serum bilirubin level more than 10 mg/dl at five days old than infants fed solely by infant formula.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Factors affecting the severity of neonatal jaundice of unknown etiology: the role of enterohepatic circulation. 162 48

Infants who consume casein hydrolysate formula have been shown to have lower neonatal jaundice levels than infants who consume routine formula or breast milk. Because casein hydrolysate has been shown to contain a beta-glucuronidase inhibitor, one possible mechanism to explain this finding is blockage of the enterohepatic circulation of bilirubin by a component of the formula. The aim of this research was to identify the source of the beta-glucuronidase inhibition in hydrolyzed casein. A beta-glucuronidase inhibition assay and measurements of physical and kinetic parameters were used to analyze the components of hydrolyzed casein and infant formulas. Kinetic studies used purified beta-glucuronidase. The L-aspartic acid in hydrolyzed casein accounts for the majority of the beta-glucuronidase inhibition present. Kinetic studies indicate a competitive inhibition mechanism. L-aspartic acid is a newly identified competitive inhibitor of beta-glucuronidase.
 ...
PMID:A novel inhibitor of beta-glucuronidase: L-aspartic acid. 1156 88