Synthesis, In Silico Logp Study, and In Vitro Analgesic Activity of Analogs of Tetrapeptide FELL

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Neuroscience

Background:

• Inflammation is a common immune response often associated with pain.
• Current analgesics have limitations, including adverse effects and insufficient efficacy.
• There is a continuous need for novel pain-relieving agents.

Purpose of the Study:

• To synthesize and evaluate novel tetrapeptide analogs of FELL.
• To investigate the impact of structural modifications and hydrophobicity on analgesic activity.
• To identify new compounds with improved pain-relieving properties.

Main Methods:

• Tetrapeptide analogs (FELL-Glu-X3-X4-Z) were synthesized using solid-phase peptide synthesis (Fmoc/OtBu strategy).
• Compounds were analyzed for purity (HPLC) and structure (ESI-MS).
• Log p values were calculated, and analgesic activity was assessed using the Paw-pressure test (Randall-Selitto test).

Main Results:

• Leucine (Leu) was identified as the most effective hydrophobic amino acid at position 3 or 4 in the FELL structure.
• Various analogs were synthesized and tested for their pain-relieving potential.

Conclusions:

• The parent compound FELL and its C-terminal amide analog demonstrated the most significant analgesic activity.
• These findings highlight the potential of specific FELL analogs as candidates for new pain management therapies.