Therapeutic peptides are somewhere between traditional medicine and biological therapies. They are a set of short amino-acid chains with specific roles in the regulation of biological systems, typically acting on receptors, enzymes or signalling pathways. One of the benefits related to their increasing use in medicine is that they can interact closely with biological targets.
Now, from the early hormone therapeutics to the newer engineered peptides, the science of peptides has undergone a lot of transformation. Bachem peptides are used in research projects, highlighting the need for peptide chemistry of high reliability standards with sequence, purity, structure and consistency throughout the development of chemotherapeutic (chemical) projects. The objective is not just to make a peptide, but make a molecule which will act pre-establishable in the body.
How Peptides Work in the Body
A therapeutic peptide is the order of amino acids which largely define its shape and behaviour. After being delivered, it can attach to a receptor on the cell surface and either stimulate or inhibit a signal within the cell. Some peptide medicines are designed to be similar to natural hormones, and others are designed to give a more specific action.
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The majority of peptide drugs bind to one of the “communication” proteins known as G protein-coupled receptors (GPCRs). A peptide can act on a receptor which in turn can affect processes like hormone release, inflammation or pain signalling. This action has focused the interest of drug researchers on peptides.
Why Peptide Design Matters
For a peptide to be biologically potent, it would need to be able to reach its target, but also not get degraded too easily, if not at all, for use in medicine. Enzymes in the body very often break down natural peptides, and many natural peptides have a difficult time penetrating cell membranes as they tend to be relatively large and hydrophilic. Scientists hence attempt to make structural changes in peptides to promote their stability, length, and absorption or the specificity of their target. Examples of design factors are:
- Mutating certain amino acids to avoid digestion;
- Modifying ends of peptide to enhance stability;
- Adding chemical groups that can extend circulation time; and
The Challenge of Delivery
The delivery of a peptide to the correct place can be as challenging as designing the peptide. Many peptides can be degraded by the digestive system, and size and polarity may hinder the passage across biological barriers. For this reason, much of the peptide-based pharmaceutical medications that are used to treat a number of diseases have historically been injected; researchers are currently seeking other methods to deliver these drugs.
Formulation is also critical, as peptides are also temperature-, pH-, agitation-, and other environmentally sensitive. Insufficient physical stability can lead to molecules clumping together and leading to either loss of activity or safety issues. Scientists will therefore investigate the behaviour of the peptide in the production process, storage, transit, and when given to the patient.
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In conclusion, therapeutic peptides are a science of precisely regulating a biological message. Limitations of peptides have been reduced by the progress in peptide synthesis, design, formulation and delivery of peptides. But each new peptide must still be thoroughly tested, because while a promising molecular interaction could well be a promising drug, it isn’t necessarily a safe one.