Clinical Trial: Hormonal Sensitivity in Patients With Noonan and LEOPARD Syndromes

Study Status: Not yet recruiting
Recruit Status: Not yet recruiting
Study Type: Observational

Official Title: Consequences of Noonan Syndrome/LEOPARD Syndrome Associated Shp2 Mutations on Different Signaling Pathways Activation: Relationship With Hormonal Sensitivity

Brief Summary:

Noonan and LEOPARD syndromes share, with variable severity, different clinical traits, notably craniofacial manifestations, cardiopathies, short stature, and juvenile cancers.

The main genetic cause of these syndromes is missense mutation of the gene encoding the ubiquitous tyrosine phosphatase Shp2, found in more than half the patients with NS and in 80% of LS cases. Shp2 plays pivotal roles in development, growth, and metabolism by regulating key signalling pathways (Ras/Mitogen activated protein kinase (MAPK), Phosphoinositide-3 Kinases (PI3K)/Akt) in response to growth factors/hormones. Deregulation of these signalling pathways has been causally linked to NS and LS pathophysiology.

This project aims at better understanding hormonal sensitivity abnormalities in patients with Noonan syndrome (NS) or LEOPARD syndrome (LS) caused by mutations of the tyrosine phosphatase Shp2.

To reach this goal, the investigators will take advantage of different tissues (fibroblasts ± adipocytes) from patients with NS / LS compared to healthy controls.

All patients will have a skin biopsy and only patients about to undergo surgery will have a adipose tissue biopsy.


Detailed Summary:

The activation of different signaling pathways (Ras/MAPK, PI3K/Akt) in response to growth factors/hormones (growth hormone, insulin) in fibroblasts and/or in adipocytes from patients with NS or LS will be compared to those of healthy subjects.

These data will be correlated to clinical, hormonal, and biochemical characteristics of patients


Sponsor: Institut National de la Santé Et de la Recherche Médicale, France

Current Primary Outcome: Phosphorylation of Erk and Akt in fibroblasts [ Time Frame: Baseline ]

To evaluate different signaling pathways activation (Ras/MAPK, PI3K/Akt) in response to growth factors/hormones (growth hormone, insulin) in fibroblasts from patients with NS or LS compared to healthy controls


Original Primary Outcome: Same as current

Current Secondary Outcome: Phosphorylation of Erk and Akt in adipocytes [ Time Frame: Baseline ]

To evaluate different signaling pathways activation (Ras/MAPK, PI3K/Akt) in response to growth factors/hormones (growth hormone, insulin) in adipocytes from patients with NS or LS compared to healthy controls


Original Secondary Outcome: Same as current

Information By: Institut National de la Santé Et de la Recherche Médicale, France

Dates:
Date Received: March 4, 2014
Date Started: November 2015
Date Completion: July 2018
Last Updated: November 6, 2015
Last Verified: November 2015