MicroRNA Is Downregulated in Invasive Non-Functioning Pituitary Adenomas

Area of Science:

• Endocrinology
• Molecular Biology
• Oncology

Background:

• Pituitary adenomas (PAs) are common tumors, with non-functioning pituitary adenomas (NFPAs) and prolactinomas being significant subtypes.
• Accurate and non-invasive diagnostic biomarkers are crucial for managing PAs, reducing the need for invasive procedures.
• MicroRNAs (miRNAs) are emerging as potential biomarkers due to their stability in bodily fluids like serum.

Purpose of the Study:

• To evaluate the diagnostic potential of specific serum miRNAs (hsa-miR-16-5p, hsa-miR-143-3p, hsa-miR-423-5p, hsa-miR-137-3p, hsa-miR-489-5p, hsa-miR-520-3p, hsa-miR-486-5p, and hsa-miR-200a-3p) in patients with invasive NFPAs and prolactinomas.
• To determine if selected miRNA expression levels correlate with tumor type or invasiveness.

Main Methods:

• Serum samples were collected from 62 patients with NFPAs and 18 with macroprolactinoma.
• MicroRNA isolation and expression profiling were performed using TaqMan MicroRNA assays.
• Statistical analyses, including ROC curve analysis, were conducted to assess diagnostic utility and correlations.

Main Results:

• Total microRNA concentration was significantly lower in NFPAs compared to controls (p=0.0419).
• ROC analysis indicated a potential, albeit limited, predictive value for overall miRNA levels (AUC=0.629, p=0.052).
• No significant correlation was found between the expression of individual miRNAs (hsa-miR-143-3p, hsa-miR-16-5p, hsa-miR-423-5p) and tumor type or invasiveness.

Conclusions:

• Despite a significant difference in total microRNA levels, the investigated specific miRNAs (hsa-miR-16-5p, hsa-miR-143-3p, hsa-miR-423-5p) are not suitable as non-invasive biomarkers for invasive NFPAs and prolactinomas.
• Further research may be needed to identify more specific and reliable miRNA biomarkers for pituitary adenomas.