Study summary · research use only
An immuno polymerase chain reaction screen for the detection of CJC-1295 and other growth-hormone-releasing hormone analogs in equine plasma
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this equine (horse) assay-development study, the authors describe an immuno-polymerase chain reaction (I-PCR) test for detecting CJC-1295, a 30 amino acid peptide-based drug that stimulates growth hormone release and covalently binds plasma proteins via a maleimidopropionic acid group, making it hard to detect by mass spectrometry. Using monoclonal antibodies raised against CJC-1295, the I-PCR assay detected the CJC-1295-protein conjugate down to 0.8 pg/mL. Because endogenous equine GHRH was also detected, a screening threshold of 50 pg/mL was set for equine plasma. The assay's ability to detect CJC-1295 use was confirmed in blood samples from thoroughbred race horses given the drug.
Abstract
CJC-1295 is a 30 amino acid peptide-based drug that stimulates the release of growth hormone (GH) from the pituitary gland. It is unique among performance-enhancing peptides due to the presence of a reactive maleimidopropionic acid group that covalently links the peptide to free thiols on the surface of plasma proteins. Once conjugated, CJC-1295 remains active in the bloodstream for significantly longer than non-conjugated peptide-based drugs that are rapidly excreted. Conjugation of CJC-1295 to plasma proteins prevents its detection by top-down mass-spectrometry-based peptide screening protocols as it effectively becomes a macromolecular protein with an undefined molecular weight. Using a pair of monoclonal antibodies raised against the CJC-1295 peptide, we present an immuno-polymerase chain reaction (I-PCR) assay that is capable of detecting the CJC-1295-protein conjugate at concentrations down to 0.8 pg/mL. Detection of endogenous equine GHRH necessitated a screening threshold for CJC-1295 in equine plasma of 50 pg/mL. The effectiveness of the assay for controlling the illicit use of CJC-1295 was confirmed in equine blood samples after administration in thoroughbred race horses.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Don't just trust this summary: follow the citation to its source and read it yourself. Research use only.