Thymosin stimulates secretion of luteinizing hormone-releasing factor.
Rebar. R W RW; Miyake. A A; Low. T L TL; Goldstein. A L AL
Key Findings
- Thymosin alpha‑1 did not stimulate luteinizing hormone‑releasing factor (LHRF) secretion from rat hypothalami.
- Thymosin fraction 5 and thymosin beta‑4 did stimulate LHRF secretion.
- Luteinizing hormone (LH) release occurred only when hypothalamus and pituitary were together; pituitary alone didn’t respond to thymosin.
Practical Outcomes
- Thymosin alpha‑1 is unlikely to affect reproductive hormone levels, so it isn’t a useful supplement for boosting fertility or testosterone. If you’re looking to influence LH/FSH, other thymic peptides might be worth exploring, but current evidence is limited to animal studies.
Summary
In rat brain experiments, the peptide thymosin alpha‑1 did not trigger the release of hormones that control reproduction, while other thymus‑derived peptides did. This means thymosin alpha‑1 isn’t useful for boosting reproductive hormones like LH in humans.
Abstract
Partially purified thymosin fraction 5 and one of its synthetic peptide components, thymosin beta 4, but not thymosin alpha 1, stimulated secretion of luteinizing hormone--releasing factor from superfused medial basal hypothalami from random cycling female rats. In addition, luteinizing hormone was released from pituitary glands superfused in sequence with hypothalami. No release of luteinizing hormone in response to thymosin was observed from pituitaries superfused alone. These data provide the first evidence of a direct effect of the endocrine thymus on the hypothalamus and suggest a potentially important role for thymic peptides in reproductive function.
Study Information
pubmed
1981
1981-11-06T00:00:00.000Z
10.1126/science.7027442