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Tesamorelin is a synthetic analog of endogenous growth hormone–releasing hormone (GHRH) designed to stimulate endogenous growth hormone (GH) secretion via the GHRH receptor (GHRH-R) on pituitary somatotrophs.
In preclinical research, Tesamorelin is studied as a physiologic GH-axis modulator, allowing investigators to examine hypothalamic–pituitary signaling, GH pulsatility, endocrine feedback, and metabolic downstream effects without administering exogenous GH.
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Tesamorelin is a synthetic analog of endogenous growth hormone–releasing hormone (GHRH) designed to stimulate endogenous growth hormone (GH) secretion via the GHRH receptor (GHRH-R) on pituitary somatotrophs.
In preclinical research, Tesamorelin is studied as a physiologic GH-axis modulator, allowing investigators to examine hypothalamic–pituitary signaling, GH pulsatility, endocrine feedback, and metabolic downstream effects without administering exogenous GH.
Sequence (as provided): H-Tyr-Ala-Asp-Ala-Ile-Phe-Thr-Asn-Ser-Tyr-Arg-Lys-Val-Leu-Gly-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu-Ser-Arg-Gln-Gly-Gly-Ser-Ser-Ala-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu-Ser-Arg-NH₂
Molecular Formula: C₂₂₁H₃₆₆N₇₂O₆₇
Molecular Weight: 5136.0 g/mol
PubChem CID: 16136333
CAS Number: 218949-48-5
Primary application
Used to study:
GHRH receptor signaling
Pituitary somatotroph activation
Endogenous GH pulse generation
Applied in models examining:
GH amplitude and frequency modulation
IGF-1–mediated negative feedback
Preservation of physiologic GH rhythms
Used to investigate:
Crosstalk between GH, IGF-1, insulin, and lipid metabolism
Central vs peripheral endocrine signaling control
Neuroendocrine regulation without direct hormone replacement
In preclinical systems, Tesamorelin is applied to study:
Lipid metabolism signaling
Visceral adipose regulation
GH-dependent metabolic pathways
Tesamorelin serves as a benchmark GHRH analog in:
GHRH-R binding assays
Structure–activity relationship (SAR) studies
Comparison with other GH secretagogues
Tesamorelin binds GHRH-R on pituitary somatotroph cells
GHRH-R → Gs protein → adenylyl cyclase → ↑ cAMP → PKA activation
Increased GH synthesis and pulsatile secretion
GH enters systemic circulation
GH acts on peripheral tissues
Indirect activation of IGF-1 transcription
Regulation of lipid, glucose, and protein metabolism
IGF-1 provides negative feedback to hypothalamus and pituitary
Maintains physiologic hormonal balance
Tesamorelin → GHRH-R → cAMP/PKA signaling → endogenous GH release → IGF-1 activation → metabolic & anabolic pathway regulation
| Attribute | Significance |
|---|---|
| GHRH analog | Mimics natural hypothalamic signaling |
| Endogenous GH stimulation | Avoids exogenous GH exposure |
| cAMP-mediated pathway | Clean, well-characterized signaling |
| Preserved feedback loops | Physiologic endocrine modeling |
| Extensive literature | Widely used GH-axis research tool |
Across in-vitro and animal models, Tesamorelin has been shown to:
Selectively activate GHRH receptors
Increase cAMP-mediated GH release
Preserve normal endocrine feedback loops
Avoid supraphysiologic GH exposure
Support metabolic and anabolic signaling indirectly via GH
Importantly, Tesamorelin does not act directly on peripheral tissues—its effects are mediated through central pituitary signaling, making it a preferred tool for studying regulated endocrine output.
