#1 Clinical Trials Search in Europe

Methionine

Methionine, an essential amino acid, is being studied in various clinical trials for its potential in cancer imaging and treatment. This article explores the use of methionine in positron emission tomography (PET) scans for cancer detection and its possible therapeutic applications in different types of cancers and other medical conditions.

Table of Contents

What is Methionine?

Methionine is an essential amino acid, which means our bodies cannot produce it on their own, and we must obtain it through our diet or supplements. It plays a crucial role in various bodily functions, including protein synthesis and metabolism[1]. In medical research, methionine is being studied in different forms for its potential therapeutic benefits.

Methionine is also known by several other names, depending on its form and use:

  • D-methionine or D-met: A specific form of methionine used in some studies[2]
  • L-[11C]methionine or [11C]-L-Methionine: A radiolabeled form used in imaging studies[3]
  • S-Adenosyl Methionine or SAMe: A naturally occurring compound derived from methionine[4]

Medical Uses of Methionine

Methionine is being investigated for its potential benefits in treating various conditions:

  • Noise-Induced Hearing Loss (NIHL): D-methionine is being studied as a potential preventive treatment for hearing loss caused by loud noises, such as those experienced during military training[2].
  • Cancer Imaging: L-[11C]methionine is used in PET (Positron Emission Tomography) scans to help detect and monitor various types of cancer, particularly brain tumors[3][5].
  • AIDS-related Myelopathy: Methionine is being investigated as a potential treatment for myelopathy (a disorder of the spinal cord) in AIDS patients[1].
  • Liver Cancer: S-Adenosyl Methionine (SAMe) is being studied for its potential to prevent recurrence after surgical removal of liver cancer[4].
  • Hand Osteoarthritis: SAMe is being researched for its potential to reduce discomfort and improve function in patients with osteoarthritis of the hands[6].
  • Smoking Cessation: SAMe is being investigated as a potential aid for people trying to quit smoking[7].
  • Recurrent Abdominal Pain in Children: SAMe is being studied for its potential to reduce abdominal pain in children[8].

Forms and Administration of Methionine

Methionine can be administered in various forms, depending on its intended use:

  • Oral supplements: SAMe is often given as oral tablets or capsules, with doses ranging from 400mg to 1600mg per day[6][7].
  • Intravenous (IV) injection: In some studies, such as those involving liver cancer patients, SAMe may be given intravenously[4].
  • Radiolabeled injection: For imaging studies, L-[11C]methionine is injected intravenously before a PET scan[3].

Ongoing Research and Potential Benefits

Researchers are actively studying methionine and its derivatives for various potential benefits:

  • Cancer detection and monitoring: L-[11C]methionine PET scans may help detect brain tumors and other cancers more effectively than traditional imaging methods[3][5].
  • Hearing protection: D-methionine is being studied for its potential to prevent or reduce hearing loss caused by loud noises, which could be particularly beneficial for military personnel[2].
  • Pain management: SAMe is being investigated for its potential to reduce pain and improve function in conditions like hand osteoarthritis[6].
  • Mood and addiction: SAMe’s potential effects on brain chemistry are being studied for conditions like depression and nicotine addiction[7].

Potential Side Effects and Precautions

While methionine and its derivatives are generally considered safe, they may cause side effects in some people. Common side effects may include:

  • Nausea
  • Stomach upset
  • Headache
  • Dizziness

It’s important to note that most studies involving methionine are still in the research phase. Always consult with a healthcare professional before starting any new supplement or medication. They can provide personalized advice based on your specific health conditions and needs[8].

Aspect Details
Primary Use in Trials Cancer imaging (PET/CT scans), particularly for brain and CNS tumors
Types of Cancers Studied Brain tumors, CNS neoplasms, head and neck cancers, solid tumors, lymphomas, sarcomas
Advantages Better tumor visualization, detection of non-enhancing tumors on MRI, evaluation of tumor aggressiveness
Limitations Short half-life of carbon-11, limited availability due to production requirements
Other Potential Applications Therapeutic use in hepatocellular carcinoma, osteoarthritis, smoking cessation
Forms Studied 11C-methionine for imaging, S-Adenosyl Methionine (SAMe) for therapeutic use
Safety Considerations Generally well-tolerated, ongoing studies to assess long-term effects and optimal dosing

FAQ

  • What is methionine and how is it used in cancer imaging? Methionine is an essential amino acid that, when labeled with radioactive carbon-11, can be used as a tracer in PET scans. This imaging technique, called methionine PET/CT, helps detect and evaluate various types of cancers, especially brain tumors and central nervous system neoplasms.
  • What types of cancers are being studied using methionine PET/CT? Methionine PET/CT is being investigated for various cancers, including brain tumors, central nervous system tumors, head and neck neoplasms, and solid tumors. It's particularly useful for evaluating high-grade and low-grade CNS tumors, as well as other cancers like lymphomas and sarcomas.
  • How does methionine PET/CT compare to other imaging techniques? Methionine PET/CT may provide more precise outlining of tumor tissue compared to MRI. It can detect tumors that don't enhance on MRI or show aggressive parts of tumors not visible with other imaging methods. This makes it valuable for diagnosis, treatment planning, and monitoring treatment response.
  • Are there any therapeutic uses of methionine being studied? Yes, some studies are exploring the therapeutic potential of methionine. For example, S-Adenosyl Methionine (SAMe) is being investigated for its possible effects on reducing recurrence after curative resection of hepatocellular carcinoma. It's also being studied for potential benefits in osteoarthritis and smoking cessation.
  • What are the limitations of using methionine in clinical practice? One limitation of using methionine PET/CT is the short half-life of carbon-11 (about 20 minutes). This means the tracer must be produced in a facility very close to where it will be used, limiting its availability to select institutions with access to a cyclotron and PET chemistry facility.

Ongoing Clinical Trials on Methionine

  • Study of Intradialytic Parenteral Nutrition for Muscle Protein Production in Patients on Long-term Hemodialysis Treatment

    Not yet recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

  • Study on Nutrition Methods and Muscle Loss After Esophagectomy Using SmofKabiven and Drug Combination for Patients Recovering from Esophageal Surgery

    Not yet recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    Denmark

  • Study on Early vs. Delayed Supplementary Parenteral Nutrition with SmofKabiven for Patients After Major Emergency Abdominal Surgery

    Not recruiting

    1 1 1 1
    Investigated diseases:
    Investigated drugs:
    Denmark

Glossary

  • Methionine: An essential amino acid that is crucial for the formation of proteins in the body. When labeled with radioactive carbon-11, it can be used as a tracer in PET scans for cancer detection.
  • PET (Positron Emission Tomography): An imaging technique that uses radioactive tracers to visualize and measure metabolic processes in the body. It's commonly used in cancer detection and monitoring.
  • CT (Computed Tomography): An imaging method that uses X-rays to create detailed cross-sectional images of the body. Often combined with PET for more comprehensive imaging.
  • MRI (Magnetic Resonance Imaging): A medical imaging technique that uses strong magnetic fields and radio waves to generate detailed images of organs and tissues in the body.
  • Glioblastoma Multiforme (GBM): An aggressive type of cancer that occurs in the brain or spinal cord, forming from cells called astrocytes that support nerve cells.
  • S-Adenosyl Methionine (SAMe): A compound involved in many biochemical processes in the body, being studied for potential therapeutic effects in various conditions including cancer and osteoarthritis.
  • Cyclotron: A type of particle accelerator used to produce radioactive isotopes for medical imaging and research purposes.
  • Hepatocellular Carcinoma: The most common type of primary liver cancer, often occurring in people with chronic liver diseases.
  • Noise-Induced Hearing Loss (NIHL): Hearing impairment resulting from exposure to loud noise, which can cause damage to structures in the inner ear.
  • Tinnitus: The perception of noise or ringing in the ears, often associated with hearing loss or other ear problems.

References

  1. https://clinicaltrials.gov/study/NCT00032695
  2. https://clinicaltrials.gov/study/NCT02903355
  3. https://clinicaltrials.gov/study/NCT00840047
  4. https://clinicaltrials.gov/study/NCT02586285
  5. https://clinicaltrials.gov/study/NCT05511714
  6. https://clinicaltrials.gov/study/NCT05363020
  7. https://clinicaltrials.gov/study/NCT00722124
  8. https://clinicaltrials.gov/study/NCT00694564