Preparation of nanoliposomes containing HER2/neu (P5+435) peptide and evaluation of their immune responses and anti-tumoral effects as a prophylactic vaccine against breast cancer.

Abstract

HER2/neu is an immunogenic protein inducing both humoral and cell-mediated immune responses. The antigen-specific cytotoxic T lymphocytes (CTLs) are the main effector immune cells in the anti-tumor immunity. To induce an effective CTL specific response against P5+435 single peptide derived from rat HER2/neu oncogene, we used a liposome delivery vehicle. In vivo enhancement of liposome stability and intracytoplasmic delivery of peptides are the main strategies which elevate the liposome-mediated drug delivery. Liposomes containing high transition temperature phospholipids, such as DSPC, are stable with prolonged in vivo circulation and more accessibility to the immune system. Incorporation of DOPE phospholipid results in the effective delivery of peptide into the cytoplasm via the endocytotic pathway. To this end, the P5+435 peptide was linked to Maleimide-PEG2000-DSPE and coupled on the surface of nanoliposomes containing DSPC: DSPG: Cholesterol with/without DOPE. We observed that mice vaccinated with Lip-DOPE-P5+435 formulation had the highest number of IFN-γ- producing CTLs with the highest cytotoxic activity that consequently led to significantly smallest tumor size and prolonged survival rate in the TUBO mice model. In conclusion, our study indicated that the liposomal form of P5+435 peptide containing DOPE can be regarded as a promising prophylactic anti-cancer vaccine to generate potent antigen-specific immunity.

• Authors: Laleh Naghibi, Mona Yazdani, Amir Abbas Momtazi-Borojeni, Atefeh Razazan, Sheida Shariat, Mercedeh Mansourian, Atefeh Arab, Nastaran Barati, Mahdieh Arabsalmani, Azam Abbasi, Zahra Saberi, Ali Badiee, Seyed Amir Jalali, Mahmoud Reza Jaafari
• Journal: PloS one (PLoS One) Vol. 15 Issue 12 Pg. e0243550 ( 2020) ISSN: 1932-6203 [Electronic] United States
• PMID: 33301467 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Cancer Vaccines
• Liposomes
• Peptide Fragments
• Peptides
• Interferon-gamma
• Erbb2 protein, mouse
• Receptor, ErbB-2

Topics

• Animals
• Breast Neoplasms (immunology, prevention & control)
• CD8-Positive T-Lymphocytes (immunology)
• Cancer Vaccines (immunology)
• Cell Line, Tumor
• Drug Delivery Systems (methods)
• Female
• Immunity (drug effects)
• Interferon-gamma (metabolism)
• Liposomes (therapeutic use)
• Mice
• Mice, Inbred BALB C
• Nanoparticles (therapeutic use)
• Peptide Fragments (immunology)
• Peptides (immunology)
• Pre-Exposure Prophylaxis (methods)
• Receptor, ErbB-2 (immunology)
• T-Lymphocytes, Cytotoxic (immunology)