Dysregulation of microRNAs (miRNAs) and their target genes in placental tissue is associated with foetal growth restriction.
We aimed to evaluate associations of placental miR-21-5p, miR-141-3p and miR-210-3p expression with maternal, placental and newborn parameters and with placental expression of their potential target genes PTEN, VEGF, FLT and ENG in a set of well-characterized small- (SGA) and appropriate- (AGA) for gestational age full-term singleton pregnancies.
Placental samples (n = 80) from 26 SGA and 54 AGA were collected from full-term singleton pregnancies. Placental transcript abundances of miR-21-5p, miR-141-3p and miR-210-3p were assessed after normalization to a reference miRNA, mir-16-5p by real-time quantitative PCR. Placental transcript abundances of PTEN, VEGF, FLT and ENG were assessed after normalizing to a panel of reference genes.
Placental miR-21-5p transcript abundance was negatively associated with placental weight (n = 80, r = −0.222, P = 0.047) and this association was specific to the AGA births (n = 54, r = −0.292, P = 0.032). Placental transcript abundances of miR-210-3p and miR-141-3p were not associated with placental weight or birth weight in all 80 births. However, placental miR-210-3p transcript abundance was positively associated with birth weight specifically in the SGA births (n = 26, r = 0.449, P = 0.021).
Placental transcript abundance of miR-21-5p was negatively associated with PTEN transcript abundance (Spearman’s ρ = −0.245, P = 0.028) while that of miR-141-3p was positively associated with FLT (Spearman’s ρ = 0.261, P = 0.019) and ENG (Spearman’s ρ = 0.259, P = 0.020) transcript abundances in all 80 births.
We conclude that placental miR-21-5p and miR-210-3p may be involved in fetoplacental growth. However, this regulation is unlikely to be mediated through placental expression of PTEN, VEGF, FLT or ENG.
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We thank the pregnant women who participated in the study and doctors and nurses who made this study possible. The contribution of the research assistants Ms. Nancy N, Ms. Roopashree C, Ms. Aruna BS and Ms. Arogya M who collected the samples and data is acknowledged. Histopath technician Ms. Mahalakshmi S assisted the pathologists in placental grossing experiments. We gratefully acknowledge the guiding role of Prof. TS Sridhar in initial establishment of human placental tissue-related protocols.
This work was supported by the Women Scientist Scheme, Department of Science & Technology, Government of India to PK (Reference no. SR/WOS-A/LS-669/2016) and the Department of Biotechnology, Government of India grants to AM and AVK (Grant sanction nos. BT/PR22326/MED/97/349/2016 and BT/PR30276/MED/97/399/2018).
The authors declare no competing interests.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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Kochhar, P., Dwarkanath, P., Ravikumar, G. et al. Placental expression of miR-21-5p, miR-210-3p and miR-141-3p: relation to human fetoplacental growth. Eur J Clin Nutr (2021). https://doi.org/10.1038/s41430-021-01017-x