Monomeric DAPTA

Other Names: Adaptavir, D-Ala1-peptide T-amide, DAPTA, Peptide T, RAP101, mDAPTA, monomeric D-Ala-peptide T-amide Drug Class: CCR5 Antagonist
Molecular Formula: C35 H56 N10 O15
Registry Number: 106362-34-9 (CAS) Chemical Name: (D-Ala1) Peptide T Amide; DAPTA  Chemical Class: Peptides Organization: RAPID Pharmaceuticals Phase of Development: II

Chemical Image:

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Molecular Weight: 856.882

(Compound details obtained from ChemIDplus Advanced,1 NIAID Therapeutics Database,2 RAPID Pharmaceuticals press release,3 and Antiviral Research article4)


Mechanism of Action: HIV-1 CCR5 antagonist. Monomeric DAPTA (mDAPTA) is a reformulated monomeric form of peptide T ([D-Ala1] Peptide T Amide; DAPTA), a synthetic octapeptide compound derived from the gp120 V-2 region of HIV. Peptide T is a selective CCR5 co-receptor antagonist that prevents viral entry by directly binding to the CCR5 co-receptor and subsequently inhibiting the interaction between HIV-1 gp120 and CCR5.4-7In vitro, mDAPTA has been shown to inhibit the release of CXCR4- and CCR5-tropic HIV from CD8-depleted PBMCs isolated from donors without HIV and from  donors with HIV with viral load levels of less than 50 copies/mL.8

Half-life (T½): In a Phase I study involving participants with AIDS or AIDS-related complex (ARC), peptide T demonstrated biphasic plasma kinetics following intravenous (IV) or intranasal (IN) administration, with a first compartment half-life of 30 to 60 minutes and a second compartment plasma clearance time of 4 to 6 hours.9

Metabolism/Elimination: In a Phase I study, participants with AIDS or ARC received peptide T via IV or IN administration. After administration, the drug could not be detected in urine.9

Resistance: In a small study of 11 participants with HIV receiving peptide T either alone or in combination with their current ART for up to 32 weeks, no obvious CCR5 to CXCR4 co-receptor shift occurred, and treatment-resistant viruses did not emerge.10

Select Clinical Trials

Peptide T
Study Identifier: Not available
Sponsor: Not available
Phase: Not available
Status: This study has been completed.

Study Purpose: The purpose of this study was to evaluate the antiviral and immunological benefits of peptide T.
Study Population: Participants had HIV for a mean of 17 years and had stable viral load levels between 500 and 25,000 copies/ml. Some participants were treatment-naive; others were treatment-experienced.
Dosing: Participants received peptide T 2 mg administered intranasally 3 times a day for up to 32 weeks, given either alone or in combination with current ART.10
Selected Study Results:

Study Identifier: NCT00000392
Sponsor: National Institute of Mental Health (NIMH)
Phase: II
Status: This study has been completed.
Study Purpose: The purpose of this study was to determine the ability of peptide T to treat HIV-associated cognitive impairment.
Study Population: Participants were adults with HIV with cognitive impairment. Participants either had not used ART within 4 weeks of study entry or had been on stable ART for at least 12 weeks prior to entry.
Dosing: Participants received peptide T 2 mg administered intranasally 3 times a day for 6 months versus similarly administered placebo.11,12
Note: During this study, participant cerebrospinal fluid (CSF) and peripheral blood samples were frozen and stored. At a later time, the stored CSF and blood samples were used to conduct a retrospective analysis on the ability of peptide T to reduce viral load in a subgroup of participants from the original trial sample.6,7
Selected Study Results:

Monomeric DAPTA – reformulation of peptide T

Study Identifier: NCT00951743
Sponsor: Rapid Laboratories Inc.
Phase: II
Status: The recruitment status of this study is unknown.
Study Purpose: The purpose of this study is to evaluate the safety and toxicity of mDAPTA and the ability of mDAPTA to eliminate treatment-resistant HIV in PBMCs.
Study Population: Participants are treatment-experienced adults with HIV who have received continuous ART for at least 6 months and who have HIV RNA <200 copies/mL for at least 3 months prior to study entry.
Dosing: Participants will receive mDAPTA 0.01 mg administered intranasally twice daily for 24 weeks versus similarly administered placebo, each in combination with ART.13

Adverse Events

In a small study investigating the antiviral and immune benefits of peptide T in 11 participants with HIV, peptide T was considered safe, with no drug-associated toxicities reported. No nasal pathologies were detected.10

In the Phase II study (NCT00000392) of peptide T in participants with HIV-associated cognitive impairment, researchers indicated no clinically significant toxic effects associated with peptide T use. However, the severity of mood disturbances was significantly greater in the peptide T group than in the placebo group, with 7 Grade 3 events occurring in the peptide T group and 1 in the placebo group. Investigators indicated that this difference could be attributed to more severe mood disturbances at study entry in the peptide T group than in the placebo group. In addition, rash was significantly more severe in the peptide T group than in the placebo group. Participants receiving peptide T had a higher prevalence (borderline significant) of nasal congestion, proteinuria, and eosinophilia than participants receiving placebo.11,12

Drug Interactions

Drug interactions related to monomeric DAPTA use are currently unknown.


  1. United States National Library of Medicine. ChemIDplus Advanced: Adaptavir. https://chem.nlm.nih.gov/chemidplus/rn/106362-34-9. Accessed: August 7, 2018.
  2. National Institute of Allergy and Infectious Diseases (NIAID). NIAID ChemDB, HIV Drugs in Development. https://chemdb.niaid.nih.gov/DrugDevelopmentHIV.aspx. Accessed: August 7, 2018.
  3. RAPID Pharmaceuticals. Press Release, dated March 4, 2014. RAPID acquires all peptide T clinical data. https://web.archive.org/web/20150513080447/http://www.rapidpharma.com/rapid-acquires-all-peptide-t-clinical-data/. Accessed: August 7, 2018.
  4. Polianova MT, Ruscetti FW, Pert CB, Ruff MR. Chemokine receptor-5 (CCR5) is a receptor for the HIV entry inhibitor peptide T (DAPTA). Antivir Res. 2005;67(2):83-92.
  5. RAPID Pharmaceuticals website. Monomeric DAPTA – the long path to discovery. http://www.rapidpharma.com/en/research-developement/technology-platform/path-to-discovery.html. Accessed: August 7, 2018.
  6. Pollicita M, Ruff MR, Pert CB, et al. Profound anti-HIV-1 activity of DAPTA in monocytes/macrophages and inhibition of CCR5-mediated apoptosis in neuronal cells. Antivir Chem Chemother. 2007;18(5):285-95.
  7. Goodkin K, Vitiello B, Lyman WD, et al. Cerebrospinal and peripheral human immunodeficiency virus type 1 load in a multisite, randomized, double-blind, placebo-controlled trial of D-Ala1-peptide T-amide for HIV-1-associated cognitive-motor impairment. J Neurovirol. 2006;12(3):178-89.
  8. Agrawal L, Ducoudret O, Baichoo N, Laznicka M, Ruff M, Pert C. mDAPTA, a potent CCR5 receptor blocker, prevents viral recovery from CD8-depleted patient PBMCs with VL< 50 background. Abstract presented at: International AIDS Conference; July 18-23, 2010; Vienna, Austria. Abstract TUPE0017. http://www.abstract-archive.org/Abstract/Share/4495. Accessed: August 7, 2018.
  9. Ruff MR, Smith C, Kingan T, et al. Pharmacokinetics of peptide T in patients with acquired immunodeficiency syndrome (AIDS). Prog Neuropsychopharmacol Biol Psychiatry. 1991;15(6):791-801.
  10. Polianova MT, Ruscetti FW, Pert CB, et al. Antiviral and immunological benefits in HIV patients receiving intranasal peptide T (DAPTA). Peptides. 2003 Jul;24(7):1093-8. Available at: http://www.rapidpharma.com/uploads/media/2003-02_Publication.pdf. Last accessed on March 31, 2014.
  11. Heseltine PN, Goodkin K, Atkinson JH, et al. Randomized double-blind placebo-controlled trial of peptide T for HIV-associated cognitive impairment. Arch Neurol. 1998;55(1):41-51.
  12. National Institute of Mental Health (NIMH). Phase II study of the efficacy of peptide T in HIV-positive individuals With cognitive impairment. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on January 17, 2000. NLM Identifier: NCT00000392. https://clinicaltrials.gov/ct2/show/NCT00000392. Accessed: August 7, 2018.
  13. Rapid Laboratories Inc. Safety and efficacy of ADAPTAVIR's ability to eliminate treatment-resistant infectious virus in the blood cellular reservoir (PBMCs) of HIV patients with suppressed plasma viral load. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on July 31, 2009. NLM Identifier: NCT00951743. https://clinicaltrials.gov/ct2/show/NCT00951743. Accessed: August 7, 2018.

Last Reviewed: August 7, 2018