I. Product Origin
Gonadorelin is a synthetic decapeptide with a structure identical to gonadotropin-releasing hormone (GnRH) naturally secreted by the hypothalamus. Its development was based on the purification and analysis of the GnRH structure from the hypothalamus of pigs and sheep in 1971, for which Andrew Schally and Roger Guillemin were awarded the 1977 Nobel Prize in Physiology or Medicine. Its synthetic synthesis was subsequently achieved rapidly, and since the late 1970s, it has been used as one of the earliest GnRH analogs in veterinary and human clinical and research applications.
II. Product Parameters
Amino acid sequence: pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH₂ (single letter: pEHWSYGLRPG-NH₂)
• Molecular formula: C₅₅H₇₅N₁₇O₁₃
- Molecular weight: Approximately 1182.3 Da
• CAS number: 33515-09-2 (free base); 34973-08-5 (acetate)
• Appearance: White or off-white lyophilized powder, hygroscopic, readily soluble in water
• Purity: Research/Pharmacopoeia grade, typically ≥98% (HPLC)
- Solubility: Soluble in sterile water, dilute acetic acid, PBS, etc.; recommended to store protected from light to preserve Trp/Tyr residues.
• Stability: Dry powder -20℃ Store in a sealed container protected from light; after reconstitution, store at 4°C for short periods and -20°C for long periods. Aliquot to avoid repeated freeze-thaw cycles.
III. Core Functions
Gonadorelin binds to GnRH receptors on anterior pituitary gonadotropic cells, stimulating the synthesis and pulsatile release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) via the Gq/11–PLC–IP3/DAG–Ca²⁺ signaling pathway. This regulates the hypothalamic-pituitary-gonadal axis (HPG axis), sex hormone secretion, and gametogenesis.
Key Points: Pulsatile administration maintains/promotes LH/FSH secretion; continuous non-pulsatile exposure leads to receptor downregulation and LH/FSH inhibition (this is the principle behind the use of some long-acting GnRH agonists for disease treatment, but Gonadorelin itself is more commonly used for "stimulation/replacement" rather than sustained inhibition).
IV. Core Advantages
• Good biocompatibility: Structurally identical to endogenous GnRH, with a well-defined and predictable pathway of action. • High diagnostic value: Can be used as a GnRH stimulation test (commonly a single 100 µg dose in adults, IV/SC) to assess pituitary responsiveness through dynamic changes in LH/FSH.
• Pulse therapy friendly: Intermittent/pulse dosing can be used to restore or support HPG axis function under specific indications, unlike some long-acting analogs which initially target inhibition.
• Long history of use: Diagnostic applications have existed since around the 1980s (e.g., Factrel), and human research data is relatively abundant.
V. Applicable Scenarios
• Clinical diagnosis: GnRH stimulation test to assess pituitary gonadotropin function, hypothalamic-pituitary lesions, or postoperative residual function (often involves multiple blood samples taken before and after dosing to measure LH/FSH according to the protocol).
• Human Treatment Related (Partial Regions/Historical Use): Used for hypothalamic amenorrhea, infertility/ovulation induction related to hypogonadotropic hypogonadism, etc. (often requires a pulse pump: e.g., 5–20 µg/pulse, every 90–120 minutes).
• Male-Related Research and Clinical Discussion: In the context of testosterone therapy (TRT), intermittent dosing is sometimes used to attempt to maintain endogenous gonadotropic signaling and testicular function (mostly for research/individualized protocol discussions).
• Veterinary Applications: Ovulation induction in cattle, sheep, and other livestock; management of ovarian cysts, etc. (many commercial veterinary formulations were approved early on).
• Research: Research tool peptides for HPG axis mechanisms, GnRH receptor pharmacology, gametogenesis, and sex hormone regulation.
VI. Precautions
• Extremely short half-life: Distribution half-life is approximately several minutes, terminal half-life is in the tens of minutes range; therefore, diagnosis often uses a single bolus injection; treatment often requires a pulse pump or regular intermittent dosing.
- Drug-related reactions: Injection site reactions, headache, facial flushing, nausea, etc., may occur; rare allergic/anaphylactoid reactions require attention.
• Special risk scenarios: In the context of assisted reproduction, there may be risks such as ovarian hyperstimulation (OSH) (related to the protocol and individual).
• Regulatory and usage restrictions: In many regions, Gonadorelin is a prescription/controlled medical use; research-grade products are usually limited to laboratory research and do not necessarily mean they can be used directly in human clinical trials; some countries/regions may not have routinely marketed human formulations.
- Handling and storage: It is recommended to protect from light and moisture, and avoid repeated freeze-thaw cycles; after reconstitution, store under validated conditions for short/long-term use.
VII. Success Stories
• Diagnostic tests: The GnRH stimulation test with a single 100 µg IV/SC dose in adults has been used clinically to determine pituitary gonadotropin function and response curves, and to assist in the assessment of hypothalamic-pituitary diseases.
- Pulsed Therapy Research: In cases of female hypothalamic amenorrhea/hypothalamic hypogonadotropic infertility, pulsatile administration via portable infusion pumps (e.g., 5–20 µg/pulse, 90–120 minute intervals) to induce/restore ovulation is a classic research and application area.
• Long-Term Research Foundation: Synthesized and put into use in the 1970s, subsequent decades have accumulated substantial human and animal research data, making it a "standard tool/option" in HPG axis assessment and some treatment pathways.
Value
Gonadorelin's core value lies in its precise "probe-based" or "physiologically substitute" hypothalamic signals using a molecule completely identical to endogenous GnRH-serving as a diagnostic tool to quantify pituitary output and, under appropriate dosing modalities, for restoring/supporting HPG axis function. Furthermore, due to its well-defined structure, short duration of action, and clear pulsatile behavior, it has long been used as a key tool peptide in endocrine and reproductive research.
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