In healthy patients, bone naturally undergoes alternating processes of breakdown and reformation. This process is called remodeling and typically occurs to maintain normal bone density and mass, resulting from a balance between osteoclasts (which break down bone) and osteoblasts (which form new bone). When this balance is disrupted for various reasons, resulting in an increase in osteoclasts and a decrease in osteoblast levels, a condition called osteoporosis develops.
Osteoporosis is a systemic, chronic bone disease characterized by a decrease in bone mass and bone density. In addition, there are permanent changes in the microstructure of the bone. Due to such profound microscopic and macroscopic changes, the bones become too fragile, sensitive to any pressure, so even the slightest blow can indicate a bone fracture. Apart from that, patients do not have any other symptoms and signs of the disease, but everyday fractures make it much more difficult to perform everyday activities.
This occurs in several different forms in both sexes, but osteoporosis is most often diagnosed in women in the postmenopausal period. In addition, the elderly population is particularly susceptible because they can experience natural bone atrophy, and if a favorable factor also appears, the risk of developing the disease increases. In addition to primary forms of osteoporosis, it can also occur as part of another disease. The primary diagnosis could be hormonal metabolic diseases, Cushing's syndrome, chronic renal failure, or as a consequence of long-term use of drugs from the glucocorticoid or antiepileptic group.
In addition to osteoporosis, other diseases can also exhibit a similar path of development, characterized by lower bone density and reduced bone mass. One such diagnosis is osteonecrosis of the jaw, which often occurs as a result of long-term use of drugs from the bisphosphonate group. In this case, the lower jaw is most often affected, and a fracture of this bone would be complicated to heal and usually carries permanent consequences. Therefore, it is essential to initiate treatment as soon as possible.
In addition, various forms of atrophy share a similar mechanism of occurrence, as evidenced by an X-ray that clearly shows eroded bone, which has lost its function. Scientific studies have confirmed that while bone disease has a mechanism of occurrence that is reflected in an imbalance between osteoclasts and osteoblasts, favoring bone breakdown, Teriparatide can exhibit the same beneficial effects and contribute to healing.
Mechanism of Action
The mechanism of action, as always, differs from the indication. However, in this case, the indication for use is primarily limited to osteoporosis in men and women, or other bone diseases such as atrophy or osteonecrosis, that have a similar mechanism of occurrence.
After entering the body, Teriparatide immediately binds to PTH type 1 receptors located on osteoblasts. Immediately after binding, stimulation of the production field begins, which automatically gradually regulates the disturbed balance between osteoclasts and osteoblasts. This increases bone density and bone mass, which automatically stabilizes the bone, making it more resistant to fractures. Most importantly, this peptide can inhibit apoptosis, thereby preventing the disease from further progression. This creates more effective long-term results.
By activating specific signaling pathways, the peptide also inhibits further osteoclast synthesis and increases the expression of genes responsible for bone remodeling and formation. Another crucial effect of the peptide is the increase in trabecular and cortical bone density, which fills damaged and necrotic areas and improves the patient's condition.
In clinical studies involving patients diagnosed with osteoporosis or other similar conditions (such as osteonecrosis and bone atrophy), significant improvements were observed at both the macrocellular and microcellular levels. Most importantly, the patient's condition improved, and they generally reported a reduced susceptibility of the bone to shocks and falls, which more and more often led to fractures.
Structure
The chemical formula of this compound consists of
- one hundred and eighty-one carbon atoms,
- two hundred and ninety-one hydrogen atoms,
- fifty-five nitrogen atoms,
- fifty-one oxygen atoms,
- two sulfur atoms.
These atoms occupy a specific arrangement in space and are responsible for the tremendous value of the molecular mass.
Side Effects
Symptoms of Poor Drug Tolerance
After the first few uses of the drug, side effects that indicate the loss of tolerance to the substance often occur and include nausea, diarrhea, vomiting, dizziness, headache, muscle and joint pain, as well as a slight drop in blood pressure. These effects typically subside within a few days of use and usually do not require medical attention. However, if any of these symptoms persist for an extended period or worsen, patients are advised to contact their doctor and seek advice on dose adjustment or a change in therapy.
Injection Site Reactions
Since the primary method of use is via subcutaneous injections, it is often possible to experience unanticipated effects in the form of reactions at the injection site, which may include pain, redness, burning, or swelling. It typically takes a few days for the body to adjust to the substance and for the skin to adapt to daily injections. To speed up the recovery process or prevent the occurrence of a reaction, patients are advised to change the injection site every day.
These unhealed effects rarely require medical intervention, unless the patient already suffers from a skin disease, which could further worsen the clinical picture. In this case, the patient is advised to consult a healthcare professional to discuss changing the method of application or the use of therapy.
Hypercalcemia
The peptide primarily has an anabolic effect, initially stimulating bone breakdown, and then, through its mechanisms of action, it stimulates osteoblasts to create new, denser, and more durable bone. Due to the beginning of the bone breakdown phase, a large amount of calcium is released, which can potentially be harmful to the kidneys and put a special strain on them. If the instructions for use are followed, the body receives small amounts of the peptide every day, which constantly exhibits a mild anabolic effect, which is necessary for the later achievement of beneficial effects. Scientists assume that side effects such as hypercalcemia and secondary kidney disease occur only in cases of discontinuation of the maximum recommended dose.
Safety
Based on previous clinical studies, it has been demonstrated that Teriparatide is a safe compound when used according to its indications and instructions for use. The maximum recommended dose should never be exceeded or changed independently to avoid the occurrence of adverse effects. Regardless of the achievements made so far, Teriparatide will undoubtedly continue to be the subject of future research.