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Last name: GILLERON
First name: Jérôme
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Folliculogenesis requires communication between granulosa cells and oocytes, mediated by connexin-based gap junctions. Connexin 37 (Cx37)-deficient female mice are infertile. The present study assessed Cx37 deficiency in patients with primary ovarian insufficiency (POI). A candidate gene study was performed in patients and controls from the...
The gap junction proteins, connexins (Cx), are present in the testis and among them Cx43 play an essential role in spermatogenesis. By using an in vitro proliferation model of germ cells and Sertoli cells, we tempted here to clarify the role of Cx43 in the control of Sertoli and germ cell proliferation and apoptosis. Cx43 was detected in...
Follicle-stimulating hormone (FSH) is required for initiation and maintenance of spermatogenesis, a dynamic process of cell proliferation and maturation. By using FSH-gold particles and pulse-chase experiments, we analyzed the kinetics of FSH endocytosis in Sertoli and germ cells during development. Ultrastructural time-dependent analysis...
Abstract Background The trafficking of cargoes from endosomes to the trans -Golgi network requires numerous sequential and coordinated steps. Cargoes are sorted into endosomal-derived carriers that are transported, tethered, and fused to the trans -Golgi network. The tethering step requires several complexes, including the Golgi-associated...
Connexins (Cx), the constitutive proteins of gap junctions, are key actors of many physiological processes. Therefore alterations of Cx expression and degradation lead to the development of physiopathological disorders. Due to the formation of a double membrane vesicle termed annular gap junction (AGJ), gap junction degradation is a unique...
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Alteration of adipocyte function plays a key role in the pathogenesis of metabolic diseases such as insulin resistance and Type 2 Diabetes. This highlights the need to better understand the molecular mechanism involved in adipocyte dysfunction in order to develop new therapies against obesity-related diseases. Manipulating the expression of...
The endosomal protein-sorting machineries play vital roles in diverse physiologically important cellular processes. Much of the core membrane-sorting apparatus is conserved in evolution, such as retromer, which is involved in the recycling of a diverse set of cargoes via the retrograde trafficking route. Here, in an RNAi-based loss-of-function...
Exposure to toxic metals, specifically those belonging to the nonessential group leads to human health defects and among them reprotoxic effects. The mechanisms by which these metals produce their negative effects on spermatogenesis have not been fully elucidated. By using the Durand's validated seminiferous tubule culture model, which mimics...
We propose in this article a model describing the dynamic of a system of adipocytes, struc-tured by their sizes. This model takes into account the differentiation of a population of mesenchymal cells into preadipocytes and of preadipocytes into adipocytes; the differentiation rates depend on the mean adipocyte radius. The considered equations...
Connexins (Cx) are key regulators of cell proliferation, differentiation and apoptosis. Cx trafficking and endocytosis need interactions with a large number of signaling and scaffolding proteins. We demonstrate herein that Cx43-GFP gap junction plaque endocytosis was blocked in cells transfected by the dominant-negative form of dynamin2...
Obesity is a major worldwide public health issue that increases the risk to develop cardiovascular diseases, type-2 diabetes, and liver diseases. Obesity is characterized by an increase in adipose tissue (AT) mass due to adipocyte hyperplasia and/or hypertrophia, leading to profound remodeling of its three-dimensional structure. Indeed, the...
It has been shown that non-cytotoxic doses of Carbendazim (CBZ), a broad-spectrum benzimidazole fungicide, possess endocrine-disrupting (androgen-like) actions, ex vivo, on the pubertal rat seminiferous epithelium. Iprodione (IPR), a dicarboximide fungicide, is also known to be an endocrine-disrupter (anti-androgen). The effect of a mixture of...
In different epithelia, cell membranes contacting one another form intercellular junctional complexes including tight, adherens and gap junctions, which could mutually influence the expression of each other. We have here investigated the role of Cx43 in the control of adherens and tight junction proteins (N-cadherin, beta-catenin, occludin and...
Obesity is a growing societal scourge. Recent studies have uncovered that paternal excessive weight induced by an unbalanced diet affects the metabolic health of offspring. These reports mainly employed single-generation male exposure. However, the consequences of multigenerational unbalanced diet feeding on the metabolic health of progeny...
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Persistent organic pollutants (POPs) are environmental contaminants that interfere with normal hormonal homeostasis and act as endocrine disrupting compounds (EDC). These molecules can mimic hormone effects on metabolism. The links between metabolism and cancer are now well established. Metabolism generates reactive oxygen species (ROS), which...
Persistent organic pollutants (POPs) are environmental contaminants that interfere with normal hormonal homeostasis and act as endocrine disrupting compounds (EDC). These molecules can mimic hormone effects on metabolism. The links between metabolism and cancer are now well established. Metabolism generates reactive oxygen species (ROS), which...
International audience
Endocrine Disrupting Compounds (EDC) are found in many everyday products, like food packaging, food preservative or additive, pesticides residues, etc… Widely distributed throughout the environment and bioaccumulable in living organisms, persistent organic pollutants (POPs) are a specific class of EDC that accumulate in fat deposit. Some of...