Endocrine relationships of thymosin-alpha 1, thymosin-beta 4, and luteinizing hormone throughout the prepubertal period of development in heifers, ovariectomized heifers and ovariectomized heifers with estradiol implants.
Wise. T T; Day. M L ML; Vakharia. D D DD
Key Findings
- Thymosin‑beta‑4 levels fall then double by puberty and are not affected by removal of ovaries or estrogen implants.
- Thymosin‑alpha‑1 peak size increases with age; ovariectomy raises its overall level, but adding estradiol reduces it.
- Estradiol specifically influences thymosin‑alpha‑1 but not thymosin‑beta‑4, suggesting hormone‑peptide interaction in prepubertal development.
Practical Outcomes
- For biohackers, the study mainly shows that estrogen can affect thymosin‑alpha‑1 levels in an animal model, but it offers no direct guidance for human use, dosing, or health protocols.
Summary
This study looked at two thymus‑related peptides in young cows and how they change when the ovaries are removed or when estrogen is added. It found that one peptide (beta‑4) drops and then rises around puberty regardless of hormones, while the other (alpha‑1) shows bigger spikes as the animals age and is lowered when estrogen is present. The work is done in cattle, not people, and doesn’t give any dosage or treatment advice for humans.
Abstract
To monitor the relationships of luteinizing hormone (LH) and thymosin-alpha 1 and -beta 4 in conjunction with possible gonadal feedback mechanisms that could alter thymic function (thymosin secretion), circulating thymosin-alpha 1 and -beta 4 and LH concentrations of control heifers (n = 6), ovariectomized heifers (n = 5) and ovariectomized heifers implanted with estradiol (n = 5) were determined during the prepubertal period (initiated at 266 days of age). Sequential blood samples were collected at 12-min intervals for 8 h before ovariectomy on day 0 and on days 8, 36, 50, 64, 78, 92, 106, 120 and 134 of the experiment. Thymosin-beta 4 concentrations were not different between treatments. Thymosin-beta 4 concentrations gradually decreased until day 92 of the study, then increased two-fold by day 134 of experimental sampling (400 days of age) when all control animals had attained puberty. Concentrations of thymosin-alpha 1 changed little as animals matured, but peak amplitude did increase over time (0.287 ng/ml at day 0 to 0.403 ng/ml at day 120; P less than 0.05). Mean concentration, number of episodic peaks and peak amplitude of thymosin-alpha 1 was increased in ovariectomized heifers in comparison to ovariectomized plus estradiol implants (P less than 0.05). Prior to cyclic ovarian function (prepuberty), changes in circulating thymosin-beta 4 concentrations seem to be independent of effects of gonadal steroids but thymosin-alpha 1 was responsive to estradiol.
Study Information
pubmed
1990
1990-10-01T00:00:00.000Z
10.1016/0165-0378(90)90045-8
5
40