Ornithine decarboxylase activity in human fetal liver

Daniel Wolpaw, Alan L. Schwartz

Research output: Contribution to journalArticle

Abstract

In human fetal liver ornithine decarboxylase (EC. 4.1.1.17 (ODC)) was found to have a Km of 3.3 × 10-4 M. During human fetal development, hepatic ODC activity declined from a peak of 379 pmol/60 min/mg protein in the youngest tissue examined (5.2 cm crown-rump length, 10 weeks of gestation) to values of 1.3 ± 0.2 in fetuses greater than 12 cm (14 15 weeks of gestation). Explants of human fetal liver maintained in organ culture for 32 hr demonstrated no ODC activity in the presence or absence of insulin (1 U/ml). Explants of rat fetal liver achieved a steady state of ODC activity (12% of the fresh tissue activity) after 16 hr in organ culture and maintained this for an additional 14 hr. Regulation of hepatic ODC activity in the developing human fetus may result from hormonal influences, particularly human growth hormone (HGH) and very possibly human chorionic somatomamotropin (HCS).

Original languageEnglish (US)
Pages (from-to)224-226
Number of pages3
JournalPediatric Research
Volume10
Issue number4
DOIs
StatePublished - Jan 1 1976

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Ornithine Decarboxylase
Human Activities
Liver
Organ Culture Techniques
Fetus
Crown-Rump Length
Pregnancy
Human Growth Hormone
Human Development
Fetal Development
Insulin
Proteins

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health

Cite this

Wolpaw, Daniel ; Schwartz, Alan L. / Ornithine decarboxylase activity in human fetal liver. In: Pediatric Research. 1976 ; Vol. 10, No. 4. pp. 224-226.
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Ornithine decarboxylase activity in human fetal liver. / Wolpaw, Daniel; Schwartz, Alan L.

In: Pediatric Research, Vol. 10, No. 4, 01.01.1976, p. 224-226.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Wolpaw, Daniel

AU - Schwartz, Alan L.

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N2 - In human fetal liver ornithine decarboxylase (EC. 4.1.1.17 (ODC)) was found to have a Km of 3.3 × 10-4 M. During human fetal development, hepatic ODC activity declined from a peak of 379 pmol/60 min/mg protein in the youngest tissue examined (5.2 cm crown-rump length, 10 weeks of gestation) to values of 1.3 ± 0.2 in fetuses greater than 12 cm (14 15 weeks of gestation). Explants of human fetal liver maintained in organ culture for 32 hr demonstrated no ODC activity in the presence or absence of insulin (1 U/ml). Explants of rat fetal liver achieved a steady state of ODC activity (12% of the fresh tissue activity) after 16 hr in organ culture and maintained this for an additional 14 hr. Regulation of hepatic ODC activity in the developing human fetus may result from hormonal influences, particularly human growth hormone (HGH) and very possibly human chorionic somatomamotropin (HCS).

AB - In human fetal liver ornithine decarboxylase (EC. 4.1.1.17 (ODC)) was found to have a Km of 3.3 × 10-4 M. During human fetal development, hepatic ODC activity declined from a peak of 379 pmol/60 min/mg protein in the youngest tissue examined (5.2 cm crown-rump length, 10 weeks of gestation) to values of 1.3 ± 0.2 in fetuses greater than 12 cm (14 15 weeks of gestation). Explants of human fetal liver maintained in organ culture for 32 hr demonstrated no ODC activity in the presence or absence of insulin (1 U/ml). Explants of rat fetal liver achieved a steady state of ODC activity (12% of the fresh tissue activity) after 16 hr in organ culture and maintained this for an additional 14 hr. Regulation of hepatic ODC activity in the developing human fetus may result from hormonal influences, particularly human growth hormone (HGH) and very possibly human chorionic somatomamotropin (HCS).

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