Parathyroid hormone orchestrates calcium homeostasis by binding the PTH1 receptor and activating adenylyl cyclase signaling, making precise quantification of receptor engagement essential for endocrine and bone metabolism research. This ¹⁵N-labeled preparation spans residues 32–115, representing the complete mature hormone, and demonstrates an ED50 below 50 ng/ml in cAMP accumulation assays using MC3T3E1 osteoblast-lineage cells—a specific activity exceeding 2.0×10⁴ IU/mg that supports receptor binding competition studies and cell-based signaling experiments requiring defined dose-response relationships. The stable isotope labeling enables mass spectrometry-based pharmacokinetic tracking and structure-function analyses that distinguish exogenous hormone from endogenous PTH in complex biological matrices. With endotoxin levels under 1.0 EU/μg and purity greater than 97%, this preparation meets the quality thresholds commonly required for in vivo pharmacology models investigating calcium metabolism, antibody development campaigns, and immunoassay standardization where isotopic distinction provides experimental clarity.
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