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Peng Y, Lee J, Rowland K, Wen Y, Hua H, Carlson N, Lavania S, Parrish JZ, Kim MD. Regulation of dendrite growth and maintenance by exocytosis. J Cell Sci 2015; 128:4279-92. [PMID: 26483382 DOI: 10.1242/jcs.174771] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 10/08/2015] [Indexed: 01/07/2023] Open
Abstract
Dendrites lengthen by several orders of magnitude during neuronal development, but how membrane is allocated in dendrites to facilitate this growth remains unclear. Here, we report that Ras opposite (Rop), the Drosophila ortholog of the key exocytosis regulator Munc18-1 (also known as STXBP1), is an essential factor mediating dendrite growth. Neurons with depleted Rop function exhibit reduced terminal dendrite outgrowth followed by primary dendrite degeneration, suggestive of differential requirements for exocytosis in the growth and maintenance of different dendritic compartments. Rop promotes dendrite growth together with the exocyst, an octameric protein complex involved in tethering vesicles to the plasma membrane, with Rop-exocyst complexes and exocytosis predominating in primary dendrites over terminal dendrites. By contrast, membrane-associated proteins readily diffuse from primary dendrites into terminals, but not in the reverse direction, suggesting that diffusion, rather than targeted exocytosis, supplies membranous material for terminal dendritic growth, revealing key differences in the distribution of materials to these expanding dendritic compartments.
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Affiliation(s)
- Yun Peng
- Department of Biology, University of Washington, Seattle, WA 98195, USA
| | - Jiae Lee
- Department of Biology, University of Washington, Seattle, WA 98195, USA
| | - Kimberly Rowland
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Yuhui Wen
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Hope Hua
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Nicole Carlson
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Shweta Lavania
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
| | - Jay Z Parrish
- Department of Biology, University of Washington, Seattle, WA 98195, USA
| | - Michael D Kim
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL 33136, USA
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Chiou T, Lu T, Wu Y, Yu Y, Chu L, Liaw W. Development of a Dinitrosyl Iron Complex Molecular Catalyst into a Hydrogen Evolution Cathode. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508351] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Tzung‐Wen Chiou
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Tsai‐Te Lu
- Department of Chemistry, Chung Yuan Christian University, No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Ying‐Hao Wu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Yi‐Ju Yu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Li‐Kang Chu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Wen‐Feng Liaw
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
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Chiou TW, Lu TT, Wu YH, Yu YJ, Chu LK, Liaw WF. Development of a Dinitrosyl Iron Complex Molecular Catalyst into a Hydrogen Evolution Cathode. Angew Chem Int Ed Engl 2015; 54:14824-9. [PMID: 26440930 DOI: 10.1002/anie.201508351] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Indexed: 12/21/2022]
Abstract
Despite extensive efforts, the electrocatalytic reduction of water using homogeneous/heterogeneous Fe, Co, Ni, Cu, W, and Mo complexes remains challenging because of issues involving the development of efficient, recyclable, stable, and aqueous-compatible catalysts. In this study, evolution of the de novo designed dinitrosyl iron complex DNIC-PMDTA from a molecular catalyst into a solid-state hydrogen evolution cathode, considering all the parameters to fulfill the electronic and structural requirements of each step of the catalytic cycle, is demonstrated. DNIC-PMDTA reveals electrocatalytic reduction of water at neutral and basic media, whereas its deposit on electrode preserves exceptional longevity, 139 h. This discovery will initiate a systematic study on the assembly of [Fe(NO)2] motif into current collector for mass production of H2, whereas the efficiency remains tailored by its molecular precursor [(L)Fe(NO)2].
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Affiliation(s)
- Tzung-Wen Chiou
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan).
| | - Tsai-Te Lu
- Department of Chemistry, Chung Yuan Christian University, No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan).
| | - Ying-Hao Wu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Yi-Ju Yu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Li-Kang Chu
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Wen-Feng Liaw
- Department of Chemistry, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan).
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Kanamori T, Togashi K, Koizumi H, Emoto K. Dendritic Remodeling. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2015; 318:1-25. [DOI: 10.1016/bs.ircmb.2015.05.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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