संवर्धित सहानुभूति न्यूरॉन्स में वृक्ष के समान विकास उत्प्रेरण
Summary
हम हड्डी morphogenetic प्रोटीन 7 (बीएमपी -7) या Matrigel का उपयोग करने के लिए चुनिंदा प्राथमिक सहानुभूति न्यूरॉन्स प्रसवकालीन चूहों के बेहतर ग्रीवा ganglia (एससीजी) से अलग में वृक्ष के समान विकास को प्रेरित करने के लिए एक प्रोटोकॉल का वर्णन.
Abstract
The shape of the dendritic arbor determines the total synaptic input a neuron can receive 1-3, and influences the types and distribution of these inputs 4-6. Altered patterns of dendritic growth and plasticity are associated with impaired neurobehavioral function in experimental models 7, and are thought to contribute to clinical symptoms observed in both neurodevelopmental disorders 8-10 and neurodegenerative diseases 11-13. Such observations underscore the functional importance of precisely regulating dendritic morphology, and suggest that identifying mechanisms that control dendritic growth will not only advance understanding of how neuronal connectivity is regulated during normal development, but may also provide insight on novel therapeutic strategies for diverse neurological diseases.
Mechanistic studies of dendritic growth would be greatly facilitated by the availability of a model system that allows neurons to be experimentally switched from a state in which they do not extend dendrites to one in which they elaborate a dendritic arbor comparable to that of their in vivo counterparts. Primary cultures of sympathetic neurons dissociated from the superior cervical ganglia (SCG) of perinatal rodents provide such a model. When cultured in defined medium in the absence of serum and ganglionic glial cells, sympathetic neurons extend a single process which is axonal, and this unipolar state persists for weeks to months in culture 14,15. However, the addition of either bone morphogenetic protein-7 (BMP-7) 16,17 or Matrigel 18 to the culture medium triggers these neurons to extend multiple processes that meet the morphologic, biochemical and functional criteria for dendrites. Sympathetic neurons dissociated from the SCG of perinatal rodents and grown under defined conditions are a homogenous population of neurons 19 that respond uniformly to the dendrite-promoting activity of Matrigel, BMP-7 and other BMPs of the decapentaplegic (dpp) and 60A subfamilies 17,18,20,21. Importantly, Matrigel- and BMP-induced dendrite formation occurs in the absence of changes in cell survival or axonal growth 17,18.
Here, we describe how to set up dissociated cultures of sympathetic neurons derived from the SCG of perinatal rats so that they are responsive to the selective dendrite-promoting activity of Matrigel or BMPs.
Protocol
Discussion
इस मॉडल के लाभ में शामिल हैं: (क) संस्कृतियों सहानुभूति अन्य सेल 17,23 प्रकार के विहीन न्यूरॉन्स की एक समरूप जनसंख्या के शामिल हैं, (ख) सहानुभूति न्यूरॉन्स की वृद्धि कारक आवश्यकताओं को अच्छी तरह से स्था…
Divulgations
The authors have nothing to disclose.
Acknowledgements
इस काम के स्वास्थ्य के राष्ट्रीय संस्थान (अनुदान NS45037 R21 और R01 ES014901) से धन के द्वारा समर्थित किया गया.
Materials
| Name of the reagent | Company | Catalogue number | Comments |
| Glass coverslips | Bellco | 1943-10012 | 12 mm Round Coverslip #1 Thickness, German glass |
| Bent tip pipets | Bellco | 1273-50003 | |
| Poly-D-lysine | Sigma | P0899-100MG | Stock solution 1 mg/ml |
| Distilled water | Gibco | 15230 | |
| Fine forceps Dumont no. 4 and 5 | Fine Science Tools (FST) | 11252-30 11241-30 | |
| 20-gauge needles | Becton Dickinson | 305176 | |
| Leibovitz’s L-15 medium | Invitrogen | 11415 | |
| Collagenase | Worthington | 4176 | 1 mg/ml |
| Dispase | Roche | 04942078001 | 5 mg/ml |
| Hank’s balanced salt solution( -Ca,-Mg) | Invitrogen | 14185-052 | |
| DMEM Low glucose | Invitrogen | 11885 | |
| L-Glutamine | Invitrogen | 25030 | 20 mM |
| Insulin/Transferrin/ Selenium | Invitrogen | 51500-056 | 100X |
| Fatty-acid free BSA | Calbiochem | 126609 | |
| NGF | Harlan Bioproducts | 5017 | |
| Ham F-12 nutrient medium (F-12) | Invitrogen | 11765 | |
| Cytosine arabinoside | Sigma | C1768 | |
| Matrigel | BD Biosciences | 356234 | Avoid repeated freeze-thaw cycles |
| BMP-7 | R&D Systems Curis, Inc. | 345-BP BMP7-07H | BMPs 4, 5 and 6 work equally as well as BMP-7 and are sometimes easier to obtain commercially |
| Paraformaldehyde | Sigma | P6148 | |
| Triton X-100 | Fisher | BP151-500 | |
| Mouse anti-rat MAP2 antibody | Sternberg Monoclonals Inc. | SMI52 | 1/5000 |
| Alexa Fluor 546 goat-anti-mouse | Invitrogen | A11003 | 1/10000 |
| Mounting media | Prolong Antifade kit Molecular Probes | P7481 |
Table 1. Materials.
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