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Human placental thyroxine inner ring monodeiodinase in complicated pregnancy
Metabolism: Clinical and Experimental
|June 1, 1985
Summary
Placental production of reverse triiodothyronine (rT3) from thyroxine (T4) is unaffected by pregnancy complications. However, rT3 generation significantly changes with gestational age, particularly in cases of abortion.
Area of Science:
- Endocrinology
- Reproductive Biology
- Perinatal Medicine
Background:
- Thyroid hormone metabolism is crucial during pregnancy.
- The placenta plays a role in converting thyroxine (T4) to reverse triiodothyronine (rT3).
- Understanding placental rT3 production in various pregnancy conditions is important.
Purpose of the Study:
- To quantify net placental rT3 production from T4.
- To investigate the influence of pregnancy complications and gestational age on this process.
Main Methods:
- Placental tissue from induced abortion, spontaneous abortion, complicated pregnancies, and normal pregnancies was used.
- Supernatants were incubated with stable T4, and generated rT3 was measured via radioimmunoassay (RIA).
Main Results:
- Net placental rT3 production was not significantly different between complicated pregnancies and normal pregnancies at equivalent gestational ages.
- Placentas from patients with abortions exhibited very high net rT3 generation from T4.
- A significant negative correlation was observed between net placental rT3 production and gestational age in abortion cases.
Conclusions:
- Complications of pregnancy do not affect net placental rT3 production from T4.
- Net placental rT3 production from T4 demonstrates a significant change with the progression of gestation.
- Gestational age is a key factor influencing placental rT3 generation, especially in abortion scenarios.