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PT-141 10mg

PT-141 10mg

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PT-141, also called Bremelanotide (generic clinical name), is a heavily modified synthetic derivative of alpha-melanocyte-stimulating hormone. It has been tested in clinical trials as a treatment for both male/female hypoactive sexual desire disorder and acute hemorrhage. PT-141 is an agonist for the melanocortin-4 and melanocortin-1 receptors. Research shows that it promotes sexual arousal and stimulates the immune system.

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Product Usage: This PRODUCT IS INTENDED AS A RESEARCH CHEMICAL ONLY. This designation allows the use of research chemicals strictly for in vitro testing and laboratory experimentation only. All product information available on this website is for educational purposes only. Bodily introduction of any kind into humans or animals is strictly forbidden by law. This product should only be handled by licensed, qualified professionals. This product is not a drug, food, or cosmetic and may not be misbranded, misused or mislabled as a drug, food or cosmetic.

What Is PT-141?

PT-141, also called bremelanotide, is sometimes referred to as the female Viagra because the peptide was previously investigated in phase IIb human clinical trials for use in treating female hypoactive sexual desire disorder (HSDD). PT-141 is a melanocortin that binds primarily to melanocortin 4 receptor (MC-4R) and MC-1R. In 2009, PT-141 was also investigated as a treatment for acute hemorrhage. PT-141 is a derivative of another synthetic melanocortin, melanotan 2 (MT-2).

PT-141 Molecular Structure

PT-141 Molecular Structure

Source: PubChem

Sequence: Ac-Nle-Asp(1)-His-D-Phe-Arg-Trp-Lys(1)
Molecular Formula: C50H68N14O10
Molecular Weight: 1025.182 g/mol
PubChem CID: 9941379
CAS Number: 189691-06-3

PT-141 Research

PT-141 and Sexual Arousal

PT-141 is a unique peptide in that it stimulates the MC-4R, which is known to produce sexual arousal in the central nervous system and influence sexual behavior[1], [2]. Studies in mice have shown that agonist binding to MC-4R causes sexual arousal and increased copulation in both males and females[3], [4]. Because PT-141 works via a different mechanism than drugs like Viagra, it is possible to treat sexual arousal disorders in both men and women that stem from causes other than reduced blood flow to the genitals.

A study of men with erectile dysfunction (ED) who did not respond to sildenafil (Viagra) found that roughly one third experienced adequate erection for sexual intercourse with PT-141 (administered via nasal spray). There was also a strong dose-dependent response in the trial, indicating that PT-141 is indeed effective in certain cases[]. This suggests that PT-141 could offer insight into correcting ED in settings where sildenafil has failed and may offer insight into central causes of hypoactive sexual desire.

Duration of penile base rigidity greater than 60% for placebo compared to various doses of PT-141.

Duration of penile base rigidity greater than 60% for placebo compared to various doses of PT-141.
Source: Nature

Interestingly, PT-141 was pulled from clinical trials before it reached approval for use in women suffering from HSDD. This is despite signs that the drug increased the number of satisfying sexual events per month and decreased female sexual distress scores in a statistically significant manner without any substantial side effects[6]. Many experts who treat female sexual dysfunction (FSD) were dismayed to find the peptide was not being advanced despite positive results. They point to a lack of established endpoints for trials of FSD and socio-cultural biases against women’s sexual health as the primary roadblocks that are inhibiting approval of what they see as much-needed therapies[7]. They hope that greater attention will be given to the topic and that the FDA will establish more concrete guidelines for evaluating therapies like PT-141 that can offer benefit. These experts also expressed dismay that the pharmacological treatments were not tested in conjunction with other established means of treating sexual dysfunction as they believe that the combination may prove synergistic and that peptides like PT-141 may be useful for overcoming initial barriers and jump-starting psychological treatment modalities.

In 2017, partly in response to the outcry against the cessation of earlier trials, Phase II Reconnect trials were launched using subcutaneous injections of PT-141 for FSD. The newest version of PT-141, called Rekynda, may soon be available for use in the United States. It would be legal to use PT-141 off-label, at that point, to treat both male and female sexual dysfunction[8]. These new trials have relied on the kind of modified endpoints that experts in FSD have touted as beneficial to seeing these kinds of treatments approved.

PT-141 and Hemorrhage

In 2009, PT-141 was modified slightly and investigated as a potential treatment for hemorrhagic shock. Because PT-141 binds to both MC-1R and MC-4R, it reduces ischemia and protects tissues against inadequate blood supply in the setting of hypovolemic (hemorrhagic) shock. The drug, when administered intravenously, does not produce substantial side effects. It was last in phase IIb trials. The modified version of PT-141 is referred to as PL-6983.

PT-141 and Infection

The MC-1R has been found, in a rat model of a specific fungal infection, to possess important anti-fungal and anti-inflammatory properties[9]. This is of particular importance because current anti-fungals are limited in terms of their mechanism of action and all produce serious and treatment-limiting side effects in certain patients. Having an alternative to use in the treatment of fungal infections could reduce morbidity and mortality substantially, especially in patients with immune compromise.

PT-141 and Cancer

The MC-1R receptor is an important stimulus of DNA repair pathways and thus is of interest in cancer treatment and prevention[10]. Research shows that people with variants of MC-1R are at increased risk for both basal cell and squamous cell carcinoma[11]. Altered PT-141 may be able to correct the problems experienced as a result of these variants and prevent or treat these cancers.

Research Directions

Right now, PT-141 has received widespread and intense attention as a treatment for sexual dysfunction. There is, however, a great deal of potential research outside of sexual dysfunction and hemorrhage that PT-141 could be applied to. For instance, MC-4R is well-known to be defective or missing in certain cases of obesity and may account for as much as 6% of all cases of early-onset obesity. PT-141 offers a unique means of exploring this particular cause of obesity and potentially illustrating a pathway for intervention. MC-1R plays roles in both pain and inflammation as well as kidney pathology and the spread of infection. There is a plethora of available research that PT-141 could help to shed light on.

PT-141 exhibits minimal side effects, low oral and excellent subcutaneous bioavailability in mice. Per kg dosage in mice does not scale to humans. PT-141 for sale at Peptide Sciences is limited to educational and scientific research only, not for human consumption. Only buy PT-141 if you are a licensed researcher.

Article Author

The above literature was researched, edited and organized by Dr. Logan, M.D. Dr. Logan holds a doctorate degree from Case Western Reserve University School of Medicine and a B.S. in molecular biology.

Scientific Journal Author

Dr. Sheryl A. Kingsberg is the chief of behavioral medicine at University Hospitals Case Medical Center and professor in Reproductive Biology and Psychiatry at Case Western Reserve University. Her areas of clinical specialization include sexual medicine, female sexual disorders, cognitive behavioral psychotherapy, menopause, pregnancy and postpartum mood disorders, psychological aspects of infertility, and psychological and sexual aspects of cancer. Dr. Kingsberg’s primary research interests are in treatments for female sexual disorders and the psychological aspects of infertility and menopause. She led a randomized, placebo-controlled dose-finding trial for PT-141. She has numerous publications in many national and international journals, sits on the editorial board of Menopause and has authored numerous chapters on topics including perimenopause and sexuality, oocyte donation, infertility and aging, the treatment of psychogenic erectile dysfunction and sexuality after cancer. Dr. Kingsberg received her PhD from the University of South Florida in Tampa and completed her fellowship in sexual medicine at University Hospitals Case Medical Center. She is an active member in a number of national and international organizations including the American Psychological Association and the American Society for Reproductive Medicine. She currently sits on the Board of Trustees of The North American Menopause Society, and serves as the current treasurer of the Society for Assisted Reproductive Technologies. Dr. Kingsberg s a past president of The International Society for the Study of Women’s Sexual Health.

Dr. Sheryl A. Kingsberg is being referenced as one of the leading scientists involved in the research and development of PT-141. In no way is this doctor/scientist endorsing or advocating the purchase, sale, or use of this product for any reason. There is no affiliation or relationship, implied or otherwise, between Peptide Sciences and this doctor. The purpose of citing the doctor is to acknowledge, recognize, and credit the exhaustive research and development efforts conducted by the scientists studying this peptide. Dr. Kingsberg is listed in [12] under the referenced citations.

Referenced Citations

  1. M. Sandrock, A. Schulz, C. Merkwitz, T. Schöneberg, K. Spanel-Borowski, and A. Ricken, “Reduction in corpora lutea number in obese melanocortin-4-receptor-deficient mice,” Reprod. Biol. Endocrinol. RBE, vol. 7, p. 24, Mar. 2009.
  2. R. C. Rosen, L. E. Diamond, D. C. Earle, A. M. Shadiack, and P. B. Molinoff, “Evaluation of the safety, pharmacokinetics and pharmacodynamic effects of subcutaneously administered PT-141, a melanocortin receptor agonist, in healthy male subjects and in patients with an inadequate response to Viagra,” Int. J. Impot. Res., vol. 16, no. 2, pp. 135–142, Apr. 2004. [PubMed]
  3. H. Wessells, V. J. Hruby, J. Hackett, G. Han, P. Balse-Srinivasan, and T. W. Vanderah, “Ac-Nle-c[Asp-His-DPhe-Arg-Trp-Lys]-NH2 induces penile erection via brain and spinal melanocortin receptors,” Neuroscience, vol. 118, no. 3, pp. 755–762, 2003. [PubMed]
  4. A.-S. Rössler, J. G. Pfaus, H. K. Kia, J. Bernabé, L. Alexandre, and F. Giuliano, “The melanocortin agonist, melanotan II, enhances proceptive sexual behaviors in the female rat,” Pharmacol. Biochem. Behav., vol. 85, no. 3, pp. 514–521, Nov. 2006. [PubMed]
  5. M. R. Safarinejad and S. Y. Hosseini, “Salvage of sildenafil failures with bremelanotide: a randomized, double-blind, placebo controlled study,” J. Urol., vol. 179, no. 3, pp. 1066–1071, Mar. 2008. [PubMed]
  6. A. H. Clayton et al., “Bremelanotide for female sexual dysfunctions in premenopausal women: a randomized, placebo-controlled dose-finding trial,” Womens Health Lond. Engl., vol. 12, no. 3, pp. 325–337, 2016. [PubMed]
  7. M. K. Miller, J. R. Smith, J. J. Norman, and A. H. Clayton, “Expert opinion on existing and developing drugs to treat female sexual dysfunction,” Expert Opin. Emerg. Drugs, vol. 23, no. 3, pp. 223–230, 2018. [PubMed]
  8. “AMAG Pharmaceuticals and Palatin Technologies Enter Into Exclusive Licensing Agreement for North American Rights to RekyndaTM (bremelanotide), a Potential Treatment for a Common Female Sexual Disorder – AMAG Pharmaceuticals.” . [MarketWatch]
  9. H. Ji et al., “The Synthetic Melanocortin (CKPV)2 Exerts Anti-Fungal and Anti-Inflammatory Effects against Candida albicans Vaginitis via Inducing Macrophage M2 Polarization,” PLoS ONE, vol. 8, no. 2, Feb. 2013. [PLOS ONE]
  10. V. Maresca, E. Flori, and M. Picardo, “Skin phototype: a new perspective,” Pigment Cell Melanoma Res., vol. 28, no. 4, pp. 378–389, Jul. 2015. [PubMed]
  11. L. Feller, R. a. G. Khammissa, B. Kramer, M. Altini, and J. Lemmer, “Basal cell carcinoma, squamous cell carcinoma and melanoma of the head and face,” Head Face Med., vol. 12, p. 11, Feb. 2016. [PubMed]
  12. Clayton AH, Althof SE, Kingsberg S, et al. Bremelanotide for female sexual dysfunctions in premenopausal women: a randomized, placebo-controlled dose-finding trial. Womens Health (Lond). 2016;12(3):325–337. doi:10.2217/whe-2016-0018
  13. T. R. McMillan, M. A. M. Forster, L. I. Short, A. P. Rudecki, D. L. Cline, and S. L. Gray, “Melanotan II, a melanocortin agonist, partially rescues the impaired thermogenic capacity of pituitary adenylate cyclase-activating polypeptide deficient mice,Exp. Physiol. , vol. 106, no. 2, pp. 427–437, Feb. 2021, doi: 10.1113/EP088838.”
  14. C. Spana, R. Jordan, and S. Fischkoff, “Effect of bremelanotide on body weight of obese women: Data from two phase 1 randomized controlled trials,Diabetes Obes. Metab., vol. 24, no. 6, pp. 1084–1093, Jun. 2022, doi: 10.1111/dom.14672. ”

ALL ARTICLES AND PRODUCT INFORMATION PROVIDED ON THIS WEBSITE ARE FOR INFORMATONAL AND EDUCATIONAL PURPOSES ONLY.

The products offered on this website are furnished for in-vitro studies only. In-vitro studies (Latin: in glass) are performed outside of the body.  These products are not medicines or drugs and have not been approved by the FDA to prevent, treat or cure any medical condition, ailment or disease.  Bodily introduction of any kind into humans or animals is strictly forbidden by law.

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Prices; Payment Terms; Interest

The prices for the products and services on this Web Site are quoted, for convenience, in United States dollars and shall be as set forth in this Web Site as at the time of acceptance of an order by www.PeptideSciences.com. Prices for Products shall be subject to change without any further notice. Credit terms are within www.PeptideSciences.com's sole discretion, and unless otherwise specified in www.PeptideSciences.com's invoice, payment must be received by www.PeptideSciences.com prior to www.PeptideSciences.com's acceptance of an order.

Consequences

www.PeptideSciences.com reserves the right to suspend or terminate your account if you violate the Terms of Use Agreement. If your violation causes harm to others, you agree to indemnify and hold www.PeptideSciences.com harmless from and against any and all loss, damage, or expense. If any dispute arises between us regarding this Agreement or your use of this Web Site, it shall be resolved through good faith negotiations between the parties.

Entire Agreement

These Terms and Conditions and any terms incorporated or referred to herein constitute the entire agreement between www.PeptideSciences.com and you relating to your use of this Web Site and the subject matter hereof, and supersede any prior understandings or agreements (whether electronic, oral or written) regarding the subject matter, and may not be amended or modified except in writing, or by www.PeptideSciences.com making such amendments or modifications in accordance with this Terms and Conditions of Use Agreement.

Severability

If any part of this Terms and Conditions of Use Agreement is deemed or determined to be unenforceable, then such part shall be eliminated or limited to the minimum extent necessary. The remainder of this Terms and Conditions of Use Agreement, including any revised portion, shall remain and be in full force and effect. This Terms and Conditions of Use Agreement are the entire agreement between us governing your use of this Web Site.

Headings

The headings contained in this Terms and Conditions of Use Agreement and the www.PeptideSciences.com Privacy Policy are for reference only.

Force Majeure

www.PeptideSciences.com shall not be liable for any delay or failure in performance caused by circumstances beyond its reasonable control, including, without limitation, delays due to backorders of requested products, mail delays, customs delays or lost shipments. www.PeptideSciences.com shall not be responsible to notify the Customer in the event of such delays. The Customer shall be solely responsible to make other arrangements to purchase alternative products and any costs incurred in connection with such purchases.

Thank you again for visiting the www.PeptideSciences.com Web Site.

Complete Agreement

Except as expressly provided in a particular "legal notice" on this Site, these Terms and Conditions constitute the entire agreement between you and this Site with respect to the use of this Site, and Content. By clicking “I agree” when placing your order, you agree with ALL OF OUR TERMS and CONDITIONS as stated above as well as our Shipping and refunds Policy.

Thank you for your cooperation.