Morpho‑functional study of the hypothalamic proline‑rich polypeptide apoptotic activity against mouse Ehrlich ascites...

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Proline-rich peptides (PRPs) are bioactive polypeptides from the neurosecretory hypothalamus.
• Proline-rich polypeptide 1 (PRP-1), also known as galarmin, is a 15-amino acid peptide with suggested anti-neurodegenerative, immunoregulatory, hematopoietic, antimicrobial, and antitumor properties.
• Previous studies indicated PRP-1's cytostatic and antiproliferative effects on human chondrosarcoma and breast carcinoma cell lines.

Purpose of the Study:

• To investigate the antitumorigenic and cytotoxic effects of PRP-1.
• To explore the morpho-functional impact of PRP-1 on a mouse Ehrlich ascites carcinoma (EAC) model.

Main Methods:

• Morpho-functional analysis of EAC cells treated with PRP-1.
• Assessment of tumor cell number and viability using trypan blue staining at specific post-inoculation days.
• Apoptosis detection using an Annexin V-cyanine 3 kit.

Main Results:

• PRP-1 induced morphological features of apoptosis in EAC cells, including cell shrinkage, membrane blebbing, pyknosis, and karyorrhexis.
• PRP-1 treatment resulted in a 44% reduction in viable EAC cells by day 11 post-inoculation.
• Apoptosis assays showed a significant increase in apoptotic cells (50.33%) after 24-hour incubation with PRP-1 compared to controls (8.33%) on day 7.

Conclusions:

• PRP-1 exhibits significant antitumorigenic activity through the induction of apoptosis in Ehrlich ascites carcinoma.
• The findings support PRP-1's potential as a therapeutic agent against specific cancers.
• Further research into PRP-1's mechanism of action and efficacy in various cancer models is warranted.