Alarelin
Preclinical ResearchAlarelin
A GnRH agonist structurally similar to leuprolide. Researched for reproductive hormone regulation and studied as part of fertility and hormonal research protocols.
Dose
Varies significantly by research protocol and target species.
Route
SubQ injection
Cycle
Highly variable, ranging from single-dose studies to protocols lasting several weeks or months, depending on the research objective.
Storage
Store lyophilized powder refrigerated at 2-8°C (36-46°F) protected from light.
What is Alarelin?
Alarelin is a synthetic decapeptide analog of gonadotropin-releasing hormone (GnRH). It functions as a potent GnRH receptor agonist. Structurally similar to leuprolide, alarelin's primary research interest lies in its ability to initially stimulate and then, with chronic administration, desensitize GnRH receptors, leading to a down-regulation of gonadotropin secretion (LH and FSH). This dual effect makes it a valuable tool in reproductive hormone regulation research, particularly in studies involving fertility, estrous synchronization in animal models, and investigations into endocrine system modulation. Its applications in research extend to understanding the hypothalamic-pituitary-gonadal axis.
Key Benefits
- LH and FSH stimulation
- Reproductive hormone research
- Fertility protocol research
Mechanism of Action
- GnRH receptor agonist
- Initially stimulates then suppresses gonadotropins with chronic use
Best For
- Reproductive hormone research
- Fertility research
Body Systems
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Molecular Information
Molecular weight
1298.5 g/mol
Length
10 amino acids
Type
Gonadotropin-Releasing Hormone (GnRH) Agonist
Amino acid sequence
Pyr-His-Trp-Ser-Tyr-D-Ala-Leu-Arg-Pro-NHEt
Pyr = pyroglutamic acid; NHEt = N-ethylamide
Pharmacokinetics
Time to peak
1-3 hours post-subcutaneous injection (observed in various animal models)
Half-life
1.5 h
Time to clear
Within 24 hours for parent compound in many models.
Based on pharmacokinetic studies in various animal models and comparisons with other GnRH agonists.
Research Indications
Ovulation Induction and Synchronization
Widely studied for its role in stimulating and synchronizing ovulation in various animal species for fertility research and breeding programs.
Assisted Reproductive Technologies (ART)
Investigated as a component in protocols for controlled ovarian stimulation and synchronization in ART studies.
Gonadotropin Release Studies
Used to explore the pulsatile release patterns of LH and FSH and their regulation by GnRH.
Research Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Acute Gonadotropin Release Study | 5-10 µg/kg (variable by species) | Single subcutaneous injection | Subcutaneous |
| Chronic HPG Axis Suppression | 2-5 µg/kg (variable by species) | Once daily for 2-4 weeks | Subcutaneous |
| Ovulation Synchronization (Cattle) | 100 µg | Single intramuscular or subcutaneous injection as part of a synchronization protocol (e.g., Ovsynch) | Subcutaneous/Intramuscular |
| Fertility Enhancement (Fish) | 10-20 µg/kg | Single subcutaneous or intraperitoneal injection | Subcutaneous/Intraperitoneal |
| In Vitro Receptor Binding Studies | Nanomolar concentrations (e.g., 0.1-10 nM) | Single application to cell cultures | In vitro |
Timing is critical for alarelin protocols, especially when investigating ovulatory synchronization or pulsatile hormone release. Strict adherence to specified intervals is commonly discussed.
Peptide Interactions
- Monitor Combination
Estrogens/Progestins
Co-administration with sex steroids may alter the HPG axis response to alarelin; careful monitoring of hormonal levels is commonly discussed.
- Monitor Combination
Dopamine Agonists/Antagonists
Dopaminergic pathways can influence GnRH release; co-administration may modulate alarelin's effects on gonadotropins.
- Use Caution
Glucocorticoids
High levels of glucocorticoids can suppress the HPG axis; this may interfere with or alter the expected response to alarelin.
- Monitor Combination
Androgens
Concurrent administration of androgens may impact the feedback mechanisms of the HPG axis, requiring adjusted protocol design.
- Avoid
Other GnRH Agonists/Antagonists
Administering alarelin with other GnRH modulating compounds is generally avoided as it would confound specific research outcomes and mechanisms.
How to Reconstitute
- 1Gather alarelin lyophilized powder vial, bacteriostatic water for injection (BWFI), and sterile syringes.
- 2Carefully remove the protective cap from the alarelin vial.
- 3Wipe the rubber stopper of the alarelin vial and the BWFI vial with alcohol pads.
- 4Draw the appropriate amount of BWFI (e.g., 1mL per 1mg of peptide for a typical concentration) into a sterile syringe.
- 5Slowly inject the BWFI into the alarelin vial, directing the stream against the side of the vial to minimize foaming.
- 6Gently swirl the vial (do not shake vigorously) until the powder is completely dissolved. Inspect for any undissolved particles.
- 7Once dissolved, the solution is ready for research administration or storage.
Reconstitution should be performed with bacteriostatic water for injection to maintain sterility and stability for research protocols. Gentle swirling is advised to prevent peptide degradation.
What to Expect
- Week 1-2: Initial 'flare' effect with transient increase in LH and FSH, followed by a decline as desensitization begins.
- Week 2-4: Continued suppression of gonadotropin release and sex hormone levels in chronic administration protocols.
- Week 4-6: Stable suppression of the hypothalamic-pituitary-gonadal (HPG) axis, depending on species and protocol.
- Observational changes in reproductive physiology consistent with GnRH agonist action (e.g., suppression of estrus cycles in animal models).
Side Effects & Safety
| Effect | Frequency | Severity |
|---|---|---|
| Hot flashes with prolonged use | Common | Mild |
| Testosterone suppression with chronic use | With chronic use | Serious |
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