Exploratory screening for micro-RNA biomarkers in canine multicentric lymphoma

Area of Science:

• Veterinary Oncology
• Molecular Biology
• Biomarker Discovery

Background:

• Canine lymphoma, a common hematopoietic tumor, shares similarities with human lymphoma.
• MicroRNAs (miRNAs) are crucial for gene regulation, and their aberrant expression is linked to cancer development.
• miRNA biomarkers could offer less-invasive diagnostic tools for predicting therapeutic response and clinical outcomes in canine lymphoma.

Purpose of the Study:

• To identify dysregulated miRNAs in canine lymphoma tissues compared to healthy controls.
• To evaluate differences in miRNA expression profiles among distinct canine lymphoma subtypes.
• To explore potential miRNA biomarkers for canine lymphoma diagnosis and prognosis.

Main Methods:

• A customized PCR array was used to profile 89 canine miRNAs.
• Quantitative PCR (qPCR) quantified miRNA expression levels.
• Statistical analysis (Student's t-test) determined significant differences in miRNA expression.

Main Results:

• In diffuse large B-cell lymphoma (DLBCL), 28 and 24 miRNAs were significantly dysregulated compared to lymph node tissue and PBMCs, respectively.
• Sixteen miRNAs were commonly dysregulated across both control groups, with 12 downregulated and 4 upregulated.
• Peripheral T-cell lymphoma (PTCL) samples showed 24 and 25 dysregulated miRNAs compared to controls. Seven shared and 19 distinct miRNAs were identified between DLBCL and PTCL.

Conclusions:

• Specific miRNAs, including the miRNA-17/92 cluster, miRNA-181-family, miRNA-34a, and miRNA-150, show potential as biomarkers for canine T- and B-cell lymphomas.
• Further validation in larger cohorts and diverse patient material is necessary to confirm the diagnostic utility of these miRNA biomarkers.