2024, April 18 – “La plongée, un sport sous pression”

A la MJC d'Olivet - Le Moulin de la Vapeur - 127 rue Marcel Belot

Jeudi 18 avril à 18h30 - Entrée gratuite mais sur réservation Par ici !

Avec Martine Beaufour, enseignante à l'université d'Orléans et chercheure au Centre de Biophysique Moléculaire, équipe "Spectrométrie de masse fonctionnelle des assemblages moléculaires"

Nos espaces aquatiques sont nombreux et parfois vastes : lacs, mers, océans... Quoi de mieux que la plongée sous-marine pour les explorer ? Faune, épaves, sites archéologiques, il y a tant de choses à voir !

Lors d’une plongée, tout plongeur s’expose à des variations de pression. Nous verrons pendant cette présentation comment la pression varie avec la profondeur en milieu aquatique, et en conséquence, comment la pression impacte la gestion d’une plongée sur de nombreux aspects.

Breast cancer: towards early diagnosis by imaging

In vivo imaging of metastatic breast cancer tumors at very early stages is about to become possible. A team of chemists and biologists from the Center for Molecular Biophysics (CNRS) has indeed developed a new magnetic resonance imaging (MRI) probe which has a selective affinity for an emerging biomarker of metastatic breast cancer: Netrin- 1. Find out more on the Cnrs Chimie website.

See more and Cnrs Chmie website.

Reference
Peptide-Conjugated MRI Probe Targeted to Netrin-1, a Novel Metastatic Breast Cancer Biomarker
Clémentine Moreau, Tea Lukačević, Agnès Pallier, Julien Sobilo, Samia Aci-Sèche, Norbert Garnier, Sandra Même, Éva Tóth & Sara Lacerda
Bioconjugate Chemistry 2024
https://doi.org/10.1021/acs.bioconjchem.3c00558

Watching enzymes work in vivo with rare-earth-based molecular probes

Scientists at the CNRS Centre de Biophysique Moléculaire (CBM) in Orléans and the Institut de Chimie des Substances Naturelles (CNRS/Université Paris-Saclay) have designed luminescent probes. They are based on complexes of lanthanides (Ln), a series of rare-earth metals whose trivalent Ln3+ ions are luminescent. The special feature of these probes is that the activity of certain enzymes can modify their luminescence in the near infrared, as well as the signal observed on MRI. These probes make it possible to track the catalytic activity of an enzyme with a single molecule using several complementary imaging techniques: MRI and near-infrared optics. Essential for unambiguous detection of a biological phenomenon, this dual imaging with a single molecule avoids biases due to the use of chemically different imaging agents for each imaging technique.

This study, published in the journal Angewandte Chemie International Edition, paves the way for new non-invasive diagnostic strategies.

This work has been reported on the Cnrs Chimie website

Article reference
Lanthanide-Based Probes for Imaging Detection of Enzyme Activities by NIR Luminescence, T1- and ParaCEST MRI
Rémy Jouclas, Sophie Laine, Svetlana V. Eliseeva, Jérémie Mandel, Frédéric Szeremeta, Pascal Retailleau, Jiefang He, Jean-Francois Gallard, Agnès Pallier, Célia S. Bonnet, Stéphane Petoud, Philippe Durand & Éva Tóth
Angew. Chem. Int. Ed. 2024
https://onlinelibrary.wiley.com/doi/10.1002/anie.202317728