Chemical modification of PLG, comprising replacement of proline or/and leucine by unnatural amino acids led to analogs with high oral efficacy. The most active analog identified in the course of our works was 1-prolyl-2-phenyl-1-2-aminobutanoylglycinamide (Doreptide). Doreptide is presently further evaluated as a new drug for the treatment of Parkinson's disease.
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FSL-1 lipoprotein is a synthetic lipopeptide that is widely used in scientific research due to its potent immunostimulatory properties. It is a synthetic analog of the N-terminal lipopeptide of bacterial lipoprotein, which is known to activate Toll-like receptor 2 (TLR2) and TLR6. FSL-1 lipoprotein has been extensively studied for its biological activity, mechanism of action, and potential therapeutic applications. This paper aims to provide a comprehensive review of FSL-1 lipoprotein, including its method of synthesis or extraction, chemical structure and biological activity, biological effects, applications, future perspectives, and challenges.
Calcitonin is a hormone produced by the thyroid gland that regulates calcium levels in the body. It is a polypeptide hormone that is involved in the regulation of bone metabolism and calcium homeostasis. Calcitonin is used in medical research for its potential therapeutic effects and in environmental research for its role in pollution management.
Spexin is a neuropeptide that was first discovered in 2015. It is a small peptide consisting of 14 amino acids and is highly conserved across different species. Spexin is known to play a crucial role in regulating various physiological processes, including metabolism, reproduction, and cardiovascular function. In recent years, there has been a growing interest in the potential therapeutic applications of spexin in various fields, including medical, environmental, and industrial research.
PKA Inhibitor IV is a small molecule inhibitor that selectively inhibits the activity of protein kinase A (PKA). PKA is a critical enzyme that plays a crucial role in various cellular processes, including metabolism, gene expression, and cell proliferation. PKA Inhibitor IV has been extensively studied for its potential therapeutic applications in various diseases, including cancer, diabetes, and cardiovascular diseases.
TAT-Gap19 is a peptide that has gained significant attention in recent years due to its potential therapeutic applications. It is a cell-penetrating peptide that can cross the cell membrane and target gap junctions, which are channels that allow for intercellular communication. TAT-Gap19 has been shown to modulate gap junctions and affect various cellular processes, making it a promising candidate for drug development.
Teduglutide is a synthetic analog of glucagon-like peptide-2 (GLP-2) that is used to treat short bowel syndrome (SBS). SBS is a rare condition that occurs when a significant portion of the small intestine is removed, leading to malabsorption of nutrients and fluids. Teduglutide is administered subcutaneously and works by promoting intestinal growth and reducing dependence on parenteral nutrition.
Epitalon is a synthetic polypeptide called epithelial vitamin, which is identified as the putative active component of a bovine pineal gland extract known as epithalamin. Epitalon is a tetrapeptide with the amino acid sequence Ala-Glu-Asp-Gly. Epitalon decreases the age-related changes in immune and neuroendocrine systems, reduces the incidence of recurrent infections and chronic diseases. Epitalon appears to induce telomere elongation via increased telomerase activity in human somatic cells in vitro. Epitalon appears to inhibit the synthesis of the MMP9 protein in vitro in aging skin fibroblasts. Lower levels of DNA damage were observed in senescence-accelerated mice (SAMP-1) treated with epithalon. Several studies suggest that epithalon may cross the blood-brain barrier, where it may stimulate cortical neurons and increase levels of phosphor-CREB, a DNA-binding protein important in learning and memory.