An Actual Deconstruction of Peptides, Their Nature, and Functionality

What Peptides Actually Are

A peptide is a short chain consisting of two or more amino acids joined together by peptide bonds. When these chains reach approximately 50 amino acids or more, they are converted to proteins. Although peptides are smaller in size, they have numerous significant functions in the body.

There are various types of peptides that are used in daily processes. They assist in the regulation of blood pressure, fluid surrounding cells, and form the foundation of some drugs and supplements. Certain peptide supplements are designed to lower inflammation, heal wounds, help build collagen or build muscle.

One should keep in mind that supplements are not controlled similarly to prescription drugs. Due to this fact, not all products can be as they are stated on their labels. The majority of specialists suggest seeking products that were independently tested and consulting a healthcare provider, pharmacist, or registered dietitian before incorporating any supplement into your routine.

How Peptides Work in the Body

There are numerous functions of peptides in human biology. The following are some of the most famous ones:

Vasopressin

The hypothalamus produces vasopressin or antidiuretic hormone. It has two main duties. First, it controls the amount of water in the extracellular fluid and orders the kidneys not to release water but to retain it. Alcohol inhibits vasopressin, hence the reason why individuals urinate more when they drink. Second, vasopressin may cause an increase in blood pressure by tightening blood vessels at higher doses.

Oxytocin

Oxytocin is a hormone that is synthesized in the pituitary gland and has nine amino acids. It assists the uterus to contract during childbirth and is necessary in the milk ejection reflex when breastfeeding. Another use of oxytocin is in emotional bonding, commonly referred to as the love or cuddle hormone, since it is secreted when in close or social contact.

Defensins

These peptides play the primary role in the immune system. They possess antimicrobial properties and aid the body in recovery and wound protection.

Angiotensins

Angiotensins are a part of the renin-angiotensin system. They assist in stabilizing the blood pressure and triggering the release of aldosterone that makes the kidneys retain sodium.

Main Categories of Peptides

People group peptides in a few ways, and honestly it’s a bit loose because everyone explains it differently.

Endogenous vs. Exogenous

Endogenous ones are basically the ones your own body already makes on its own.

Exogenous peptides are the ones made somewhere else, lab processes, hydrolysis, biosynthesis, chemical setups, and then used when needed. They don’t come from the body naturally.

Length stuff

Some are tiny like dipeptides, which are literally just two amino acids stuck together.

Oligopeptides have a handful more, not too long.

Polypeptides sit around the 20–50 amino-acid area.

And sometimes people simply split them up by source, like whether they came from plants or animals. It’s not fancy, just another way people talk about them.

Where Peptides Show Up

Peptides end up doing a whole mix of things… antioxidant roles, antimicrobial actions, anti-clotting, and a bunch of other biological jobs depending on the type. Their uses fall into a few bigger areas but it’s not always a clean division.

Medications That Contain Peptides

This whole area is pretty big because, by 2017, there were already more than 80 peptide-type drugs approved in different places around the world. Some of them are basically copies of things the body already makes, and others are put together synthetically. People list them in all sorts of ways, but the usual examples show up again and again, so here they are without overthinking the format:

• GLP-1 receptor agonists and insulin, these are standard for diabetes, mainly to help manage blood sugar.
• Vasopressin is another one, used for diabetes insipidus or when someone has issues with antidiuretic hormone.
• Desmopressin also falls in here, kind of similar, and it’s used for diabetes insipidus too, plus it’s there to control that extreme thirst or the unusually heavy urination that can happen after injuries or certain surgeries.
• Cyclosporine comes up a lot since it’s used to stop organ rejection after transplants, and also for things like rheumatoid arthritis or psoriasis.
• Enfuvirtide shows up in HIV-1 treatment plans, usually combined with other drugs.
• Ziconotide is a strong one, a neurotoxic peptide used when someone has really severe chronic pain that other things don’t handle well.
• Teduglutide, a GLP-2 analogue, gets used in short bowel syndrome.
• LH-RH (or GnRH) agonists are in the mix for ovarian and prostate cancer treatments; they come up frequently in hormone-related cancer care.

There are also antimicrobial peptides in use for things like pneumonia, hepatitis C, HIV, and some bacterial infections. Depending on the treatment approach, these can be applied on the skin, taken orally, or given through IV.

And research isn’t slowing down, cancer studies keep picking at new angles. For instance, atrial natriuretic peptide (ANP) is being looked at because of its possible role in colorectal cancer, though that’s still in the research stage.

Peptide-Based Vaccines

Peptide vaccines are copies of selected proteins that are present in the pathogens, which enable the body to develop a response without having to be exposed to a complete virus or bacterium.

Cancer treatment is being studied with some peptide vaccines, in which a targeted T-cell response is induced by fragments of tumor antigens.

Nevertheless, peptide vaccines have a problem. Conventional vaccines with attenuated or inactivated pathogens may result in a more robust immune response, which is more protective. The field of peptide-based vaccine strategies is still being explored in such areas as Alzheimer disease.

Peptides in Supplements

The presence of peptides in a variety of supplement products is due to their potential advantages.

Anti-Aging Support

Collagen is a significant constituent of bone, cartilage and skin. The smaller fragments of collagen are called collagen peptides that are more digestible. Certain researches indicate that they can be used in skin elasticity, hydration and collagen density.

Wound Healing

Collagen is also commonly applied in wound care, particularly in burns or injuries that need structural support. Collagen-stimulating peptides can be used to repair the extracellular matrix (ECM), a protein and enzyme network which helps in skin repair.

Antimicrobial peptides have two advantages—they facilitate healing and protect against pathogenic microorganisms. They can be particularly useful for people whose healing is disrupted, like those with diabetes who have slow-healing wounds.

Peptides in Skin Care

There are peptides in some topical products to use as anti-aging or skin-repair products. Studies indicate that some peptides can enhance the look of photo-damaged or aging skin when used on a regular basis.

Peptide Hormones Safety Concerns

Synthetic peptide hormones are occasionally sold as quick-muscle-builders or weight-losing pills. These hormones are not intended to be used as casual supplements but rather for medical use. Abuse may result in harmful reactions.

All peptide hormones are banned by the World Anti-Doping Agency. Misuse may result in serious health issues.

Possible Side Effects

When peptides are used as intended, in medications, vaccines, supplements or cosmetics, they are generally considered to be safe. There are issues associated with the abuse of peptide hormones. Overuse or misuse of hormones such as insulin, growth hormone, erythropoietin or thyroid hormones may cause severe acute problems, such as:

• Muscle paralysis
• Muscle damage or loss
• Diabetes
• Hypothyroidism
• Excessively high blood pressure
• Extreme sweating
• Headaches
• Vomiting

Long-term risks can include:

• Plaque (deposition of atherosclerosis)
• Thrombosis (blood clots)
• Osteoporosis
• Increased cancer risk

Naturally Occurring Peptides in Food

Bioactive peptides are protein-rich foods, which are smaller fragments that can be released in the body and become active. The majority of the work on these peptides has been performed in the laboratory, not on humans, but initial results are encouraging; they may possess antimicrobial, anti-inflammatory and antioxidant properties.

Bioactive peptides are found in numerous food sources, such as:

Animal sources

• Eggs
• Milk and cheese (casein and whey proteins)
• Beef
• Pork

Marine sources

• Fish
• Squid
• Salmon
• Sea urchin
• Oyster
• Seahorse
• Snow crab

Plant sources

• Soy
• Oats
• Lentils, chickpeas, beans, peas
• Canola
• Wheat
• Flaxseed
• Hemp seed

Such peptides have the potential to be applied in the future to treat chronic issues like hypertension, obesity, diabetes, inflammatory bowel diseases, and high cholesterol. However, further studies are required to determine the effect of digestion and absorption on their actual effects in humans.