ESPE Abstracts (2019) 92 LB-18

Exploratory Case-Control Study on ACE2 Expression in Children with Short Stature

Gianluca Tornese1, Federica Tonon2, Francesca Nicolardi3, Maria Chiara Pellegrin1, Barbara Toffoli1, Elena Faleschini1, Egidio Barbi1,3, Bruno Fabris2, Stella Bernardi2

1Institute for Maternal and Child Health IRCCS "Burlo Garofolo", Trieste, Italy. 2Department of Medical Sciences, University of Trieste, Trieste, Italy. 3University of Trieste, Trieste, Italy

Background: Short stature is one of the most common presentations to paediatric endocrinologists. It is estimated that despite all the exams, in 50–90% of cases, children are labeled as having idiopathic short stature. It has been recently reported that genetic ACE2 deficiency is associated with reduced body weight as well as with impaired gestational weight gain and fetal growth restriction in pregnancy. It has been argued that ACE2 deficiency, which is usually associated with an increase of tissue Angiotensin II, could be associated with uterine artery dysfunction. Based on these premises, the aim of our study was to evaluate whether there was a difference of ACE2 expression in children with short stature as compared to age-matched controls.

Methods: For this purpose we designed an exploratory case-control study aiming at recruiting consecutively 40 children with short stature (cases) and 40 controls presenting at the Endocrinology Service. After signing the informed consent to participating in the study, children underwent a medical visit and a fasting blood sampling. Peripheral blood mononuclear cells (PBMC) were isolated to extract mRNA for gene expression analyses. Sera were collected for protein measurements.

Results: Children with short stature presented with lower height and body weight as compared to controls. Our preliminary data show that children with short stature exhibited a significant reduction of ACE2 gene expression, and a significant increase of ACE/ACE2 ratio in PBMC. This was associated with a modest increase of Angiotensin II/Angiotensin 1-7 ratio. Our multivariate analysis showed that across the groups ACE2 was independently associated with height but not with body weight.

Conclusions: Our results suggest that short stature is associated with ACE2 reduction, which could play a causative role in growth reduction through IGF-1-dependent as well as IGF-1-independent mechanisms.

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