Learn the difference between endogenous and exogenous peptides, pharmacological vs physiological dosing, feedback disruption, bioidentical vs analogues, and research implications.
Learn about insulin and glucagon as peptide hormones, the islet paracrine axis, and how GLP-1 interacts with both to regulate blood glucose in metabolic research.
Learn what peptide conjugates are including fatty acid, fluorescent, radioactive, biotin, and cell-penetrating peptide conjugation strategies and their research applications.
Learn how PEGylation extends peptide half-life through hydrodynamic radius, protease protection, and immunogenicity reduction, with PEG-MGF as the key research example.
Learn how amino acid hydrophilicity and hydrophobicity determine peptide solubility, how to use the GRAVY score, and practical solvent selection strategies for difficult peptides.
Learn how receptor desensitization and downregulation affect research peptides including Hexarelin GH axis tachyphylaxis and how to design protocols that account for these phenomena.
Trace the evolution of peptide research from insulin discovery through neuroendocrine pharmacology, GLP-1 rational design, and mitochondrial peptide biology to precision medicine.
Learn what cyclic peptides are, how cyclization improves stability and selectivity, the types of cyclization chemistry used, and examples in research compounds including oxytocin and Melanotan II.
Learn why most peptides are not orally bioavailable, the GI barriers they face, and strategies including cyclization, D-amino acids, SNAC, and nanoparticles that have achieved oral peptide delivery.
Learn the difference between in vitro and in vivo peptide research, the advantages and limitations of each, the translational hierarchy from cell culture to human studies, and ex vivo models.
