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Mehdizadeh A, Alavi A, Alhusayen R, Bauer B, Bechara FG, Bourcier M, Brassard A, Djamei V, Dutz J, George R, Ghias M, Gooderham M, Hamzavi I, Hoffman LK, Hou A, Hu H, Kimball AB, Kirchhof M, Kryzskaya D, Liy Wong MDC, Lowes MA, Lynde CW, McLellen C, Prens E, Prens L, Rogalska T, Sibbald RG, Sisic M, Tan MG, Wong DD. Proceeding report of the Symposium on Hidradenitis Suppurativa Advances (SHSA). Exp Dermatol 2017; 27:104-112. [DOI: 10.1111/exd.13445] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/29/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Ali Mehdizadeh
- University of Toronto Dalla Lana School of Public Health; Toronto ON Canada
| | | | | | - Boris Bauer
- Universitatsklinikum Wurzburg; Wurzburg Germany
| | | | | | - Alain Brassard
- Department of Dermatology; University of Alberta; Edmonton AB Canada
| | - Vahid Djamei
- Dermatology, Information Systems (Business Informatics); Information Science University of Zürich; Zürich Switzerland
| | - Jan Dutz
- Department of Dermatology & Skin Science; University of British Columbia; Vancouver BC Canada
| | - Ralph George
- Division of General Surgery; University of Toronto; Toronto ON Canada
| | - Mondana Ghias
- Montefiore Hospital and Medical Center; Bronx NY USA
| | | | | | | | - Angela Hou
- New York University Langone Medical Center; NewYork; NY USA
| | - Howard Hu
- University of Toronto Dalla Lana School of Public Health; Toronto ON Canada
| | | | - Mark Kirchhof
- Division of Dermatology; Department of Medicine; University of Ottawa; Ottawa ON Canada
| | - Darya Kryzskaya
- Division of Pediatric Dermatology; Montreal Children's Hospital; McGill University Health Center; Montreal QC Canada
| | | | | | - Charles W. Lynde
- Department of Medicine; University of Toronto; Toronto ON Canada
| | | | - Errol Prens
- Dermatology; Erasmus MC; Rotterdam The Netherlands
| | | | - Tetyana Rogalska
- Department of Family Medicine; University of Ottawa; Ottawa ON Canada
| | | | - Mia Sisic
- University of Windsor; Windsor ON Canada
| | - Marcus G. Tan
- Department of Medicine; University of Toronto; Toronto ON Canada
| | - Dennis D. Wong
- Department of Medicine; University of Toronto; Toronto ON Canada
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Djogo T, Robins SC, Schneider S, Kryzskaya D, Liu X, Mingay A, Gillon CJ, Kim JH, Storch KF, Boehm U, Bourque CW, Stroh T, Dimou L, Kokoeva MV. Adult NG2-Glia Are Required for Median Eminence-Mediated Leptin Sensing and Body Weight Control. Cell Metab 2016; 23:797-810. [PMID: 27166944 DOI: 10.1016/j.cmet.2016.04.013] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 02/12/2016] [Accepted: 04/13/2016] [Indexed: 12/31/2022]
Abstract
While leptin is a well-known regulator of body fat mass, it remains unclear how circulating leptin is sensed centrally to maintain energy homeostasis. Here we show that genetic and pharmacological ablation of adult NG2-glia (also known as oligodendrocyte precursors), but not microglia, leads to primary leptin resistance and obesity in mice. We reveal that NG2-glia contact the dendritic processes of arcuate nucleus leptin receptor (LepR) neurons in the median eminence (ME) and that these processes degenerate upon NG2-glia elimination, which explains the consequential attenuation of these neurons' molecular and electrical responses to leptin. Our data therefore indicate that LepR dendrites in the ME represent the principal conduits of leptin's anorexigenic action and that NG2-glia are essential for their maintenance. Given that ME-directed X-irradiation confirmed the pharmacological and genetically mediated ablation effects on body weight, our findings provide a rationale for the known obesity risk associated with cranial radiation therapy.
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Affiliation(s)
- Tina Djogo
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Sarah C Robins
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Sarah Schneider
- Physiological Genomics, Institute of Physiology, Ludwig Maximilians University Munich, 80336 Munich, Germany
| | - Darya Kryzskaya
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Xiaohong Liu
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Andrew Mingay
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Colleen J Gillon
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Joo Hyun Kim
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada
| | - Kai-Florian Storch
- Department of Psychiatry, Douglas Mental Health University Institute, McGill University, Montreal, QC H4H 1R3, Canada
| | - Ulrich Boehm
- Department of Pharmacology and Toxicology, University of Saarland School of Medicine, 66421 Homburg, Germany
| | - Charles W Bourque
- Centre for Research in Neuroscience, Montreal General Hospital, McGill University, Montreal, QC H3G 1A4, Canada
| | - Thomas Stroh
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC H3A 2B4, Canada
| | - Leda Dimou
- Physiological Genomics, Institute of Physiology, Ludwig Maximilians University Munich, 80336 Munich, Germany
| | - Maia V Kokoeva
- Department of Medicine, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3J1, Canada.
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Robins SC, Trudel E, Rotondi O, Liu X, Djogo T, Kryzskaya D, Bourque CW, Kokoeva MV. Evidence for NG2-glia derived, adult-born functional neurons in the hypothalamus. PLoS One 2013; 8:e78236. [PMID: 24205170 PMCID: PMC3812154 DOI: 10.1371/journal.pone.0078236] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 09/11/2013] [Indexed: 11/18/2022] Open
Abstract
Accumulating evidence suggests that the adult murine hypothalamus, a control site of several fundamental homeostatic processes, has neurogenic capacity. Correspondingly, the adult hypothalamus exhibits considerable cell proliferation that is ongoing even in the absence of external stimuli, and some of the newborn cells have been shown to mature into cells that express neuronal fate markers. However, the identity and characteristics of proliferating cells within the hypothalamic parenchyma have yet to be thoroughly investigated. Here we show that a subset of NG2-glia distributed throughout the mediobasal hypothalamus are proliferative and express the stem cell marker Sox2. We tracked the constitutive differentiation of hypothalamic NG2-glia by employing genetic fate mapping based on inducible Cre recombinase expression under the control of the NG2 promoter, demonstrating that adult hypothalamic NG2-glia give rise to substantial numbers of APC+ oligodendrocytes and a smaller population of HuC/D+ or NeuN+ neurons. Labelling with the cell proliferation marker BrdU confirmed that some NG2-derived neurons have proliferated shortly before differentiation. Furthermore, patch-clamp electrophysiology revealed that some NG2-derived cells display an immature neuronal phenotype and appear to receive synaptic input indicative of their electrical integration in local hypothalamic circuits. Together, our studies show that hypothalamic NG2-glia are able to take on neuronal fates and mature into functional neurons, indicating that NG2-glia contribute to the neurogenic capacity of the adult hypothalamus.
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Affiliation(s)
| | - Eric Trudel
- Centre for Research in Neuroscience, McGill University, Montreal, Canada
| | - Olivia Rotondi
- Department of Medicine, McGill University, Montreal, Canada
| | - Xiaohong Liu
- Department of Medicine, McGill University, Montreal, Canada
| | - Tina Djogo
- Department of Medicine, McGill University, Montreal, Canada
| | | | - Charles W. Bourque
- Centre for Research in Neuroscience, McGill University, Montreal, Canada
| | - Maia V. Kokoeva
- Department of Medicine, McGill University, Montreal, Canada
- * E-mail:
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Robins SC, Villemain A, Liu X, Djogo T, Kryzskaya D, Storch KF, Kokoeva MV. Extensive regenerative plasticity among adult NG2-glia populations is exclusively based on self-renewal. Glia 2013; 61:1735-47. [PMID: 23918524 DOI: 10.1002/glia.22554] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 05/07/2013] [Accepted: 05/31/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Sarah C. Robins
- Department of Medicine; McGill University, Royal Victoria Hospital; 687 Pine Avenue West; Montreal; Quebec; Canada
| | - Aude Villemain
- Department of Psychiatry; McGill University, Douglas Mental Health University Institute; 6875 LaSalle Blvd; Montreal; Quebec; Canada
| | - Xiaohong Liu
- Department of Medicine; McGill University, Royal Victoria Hospital; 687 Pine Avenue West; Montreal; Quebec; Canada
| | - Tina Djogo
- Department of Medicine; McGill University, Royal Victoria Hospital; 687 Pine Avenue West; Montreal; Quebec; Canada
| | - Darya Kryzskaya
- Department of Medicine; McGill University, Royal Victoria Hospital; 687 Pine Avenue West; Montreal; Quebec; Canada
| | - Kai-Florian Storch
- Department of Psychiatry; McGill University, Douglas Mental Health University Institute; 6875 LaSalle Blvd; Montreal; Quebec; Canada
| | - Maia V. Kokoeva
- Department of Medicine; McGill University, Royal Victoria Hospital; 687 Pine Avenue West; Montreal; Quebec; Canada
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