CRF (human, rat) peptide

CRF (human, rat) peptide

• Handling and Storage of Synthetic Peptides
• Material Safety Data Sheets (MSDS)

Batch to batch variation of the purity

H-SEEPPISLDLTFHLLREVLEMARAEQLAQQAHSNRKLMEII-NH2

H-Ser-Glu-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Ala-Arg-Ala-Glu-Gln-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Met-Glu-Ile-Ile-NH2

41

95.26%

C₂₀₈H₃₄₄N₆₀O₆₃S₂

4757.43

Synthetic

Powder

CRF (human, rat) is an endogenous peptide derived from a 196-amino acid preprohormone which acts as an agonist for CRF receptors, with Ki values of 11, 44 and 38 nM for hCRF1, rCRF2a and mCRF2b respectively. CRF (human, rat) is a major regulator of the hypothalamic pituitary adrenal axis response and is a stress-related neuropeptide whose dysregulation has been associated with depression. Increased CRF (human, rat) production is also associated with Alzheimer's disease.

Normally, this peptide will be delivered in lyophilized form and should be stored in a freezer at or below -20 °C. For more details, please refer to the manual: Handling and Storage of Synthetic Peptides

• Vale et al (1981) Characterization of a 41-residue ovine hypothalamic peptide that stimulates secretion of corticotropin and beta-endorphin. Science. 213(4514) 1394 PMID: 6267699
• Ohmura and Yoshioka (2008) The roles of corticotropin releasing factor (CRF) in responses to emotional stress: is CRF release a cause or result of fear/anxiety? CNS Neurol Disord Drug Targets. 8(6) 459 PMID: 19811447
• Jiang et al (2019) Role of Corticotropin Releasing Factor in the Neuroimmune Mechanisms of Depression: Examination of Current Pharmaceutical and Herbal Therapies. Front Cell Neurosci. 13 290 PMID: 31312123

Trifluoroacetic acid (TFA) has a significant impact on peptides due to its role in the peptide synthesis process.

TFA is essential for the protonation of peptides that lack basic amino acids such as Arginine (Arg), Histidine (His), and Lysine (Lys), or ones that have blocked N-termini. As a result, peptides often contain TFA salts in the final product.

TFA residues, when present in custom peptides, can cause unpredictable fluctuations in experimental data. At a nanomolar (nM) level, TFA can influence cell experiments, hindering cell growth at low concentrations (as low as 10 nM) and promoting it at higher doses (0.5–7.0 mM). It can also serve as an allosteric regulator on the GlyR of glycine receptors, thereby increasing receptor activity at lower glycine concentrations.

In an in vivo setting, TFA can trifluoroacetylate amino groups in proteins and phospholipids, inducing potentially unwanted antibody responses. Moreover, TFA can impact structure studies as it affects spectrum absorption.