Synthetic analogue of insulin-like growth factor 1 (IGF-1) carrying an arginine substitution at position 3 and a 13-amino-acid N-terminal extension. These modifications lower binding to IGF-binding proteins and extend its duration of action relative to native IGF-1. LR3 IGF-1 is primarily an established cell-culture reagent (serum-free media, bioprocessing); it is NOT an approved human medicine. Use in the bodybuilding grey market is described; as an IGF-1 analogue, LR3 IGF-1 falls under the WADA anti-doping prohibition.
IGF-1 LR3 is a recombinantly produced variant of human IGF-1. Two changes define its properties: (1) at position 3, glutamic acid is replaced by arginine; (2) a 13-amino-acid sequence is added at the N-terminus ('Long'). Both modifications drastically reduce affinity for the six IGF-binding proteins (IGFBP-1 to -6) that normally bind native IGF-1 in the blood and regulate its availability at the receptor. As a result, a larger fraction of the molecule is freely available to bind the type-1 IGF receptor (IGF-1R) — the same receptor as native IGF-1. In preclinical models and cell culture, LR3 IGF-1 therefore acts as a more potent agonist than unmodified IGF-1. The downstream signalling pathway (PI3K/Akt and MAPK) is identical to that of IGF-1; the modification changes bioavailability, not the receptor target.
Теоретическая кривая концентрации при периоде полувыведения 21 h. Чисто фармакокинетическая модель — не рекомендация по дозировке.
Open in PK tool →All forms of exogenous IGF-1 are prohibited at all times, and any substance containing any form of exogenous IGF-1 should be considered prohibited.
Пептиды поставляются в виде сухого порошка. После растворения в жидкости (восстановление) этот калькулятор отвечает на единственный вопрос: сколько вещества содержится в одном миллилитре раствора после этого?
Эти сопутствующие вещества относятся к классу пептида, а не к конкретному применению. Без рекомендаций, без дозировки.
Только наука, без продаж. Отписаться можно в любой момент.
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