This is particularly common in multiple pregnancy, trophoblastic disease and during hyperemesis gravidarum, when concentration of both hCG and thyrotropic
subtypes may be greater.
It would seem that the anterior pituitary ceases production of growth and gonadotrophic hormones and prolactin in favor of increased elaboration of thyrotropic
and adrenotrophic principles, which may be regarded as more urgently needed in such emergencies.
Relative sensibility of five breeds to an anterior pituitary exytract prossessing both thyrotropic
and gonadotropic properties.
Human chorionic gonadotropin (hCG) and thyroid function in early human pregnancy: circadian variation and evidence for intrinsic thyrotropic
activity of hCG.
The anterior pituitary releases prolactin as well as corticotropin, somatotropin, thyrotropic
and gonadotropic hormones. Together, with the hypothalamus, the anterior pituitary forms the command center for the endocrine system. The posterior pituitary is primarily responsible for the release of oxytocin and the antidiuretic hormone, vasopressin.
We have found normal concentrations of TSH as well as thyroxine, albeit at the lower end of normal range, in elderly patients with hypopituitarism, suggesting partial or early failure of thyrotropic
cells although we are not aware of any studies of progression to complete failure.
hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) were re-evaluated after 1-3 months (first control) and 5-7 months (second control) from the switch.
In chicken, the thyrotropic
axis has profound developmental effects which are intimately tied to the somatotropic axis.