title: NS21: re-defined and modified supplement B27 for neuronal cultures.
abstract: In vitro culturing of primary neurons is a mainstay of neurobiological research. Many of these culture paradigms have taken advantage of defined culture media rather than serum additives that contain undefined survival factors to facilitate experimental manipulations and interpretation of the results. To culture neurons in the absence of serum, defined supplements such as B27 are now widely used. However, commercially available supplements exhibit large variability in their capabilities to support neurons in culture. We re-optimized and modified earlier published formulations of B27 using 21 different ingredients (NS21). NS21 supports neuronal cultures of high quality as manifested by their morphological characteristics, formation of synapses, and postsynaptic responses. Much of the variability in the quality of B27/NS21 was due to variability in the quality of different sources of bovine serum albumin. Furthermore, we found that holo-transferrin used in NS21 is preferable over apo-transferrin used in B27 for the quality of neuronal cultures.
authors.affiliation: Department of Pharmacology, University of Iowa, Iowa City, IA 52242-1109, United States.
authors.forename: Yucui
authors.initials: Y
authors.lastname: Chen
authors.forename: Beth
authors.initials: B
authors.lastname: Stevens
authors.forename: Jufang
authors.initials: J
authors.lastname: Chang
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Milbrandt
authors.forename: Ben A
authors.initials: BA
authors.lastname: Barres
authors.forename: Johannes W
authors.initials: JW
authors.lastname: Hell
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000166:cytology / Q000187:drug effects; D018929:Cell Culture Techniques; D002478:Cells, Cultured; D003470:Culture Media / Q000494:pharmacology*; D016895:Culture Media, Serum-Free; D000076122:Disks Large Homolog 4 Protein; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D005727:Ganglia, Spinal / Q000166:cytology; D005786:Gene Expression Regulation / Q000187:drug effects; D006624:Hippocampus / Q000166:cytology; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism; D009474:Neurons / Q000166:cytology* / Q000187:drug effects*; D018408:Patch-Clamp Techniques / Q000379:methods; D051381:Rats; D017207:Rats, Sprague-Dawley; D012160:Retina / Q000166:cytology; D050857:Synaptotagmins / Q000378:metabolism; D013997:Time Factors; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / Q000494:pharmacology
chemical_list: D003470:Culture Media; D016895:Culture Media, Serum-Free; D000076122:Disks Large Homolog 4 Protein; C501449:Dlg4 protein, rat; D018690:Excitatory Amino Acid Agonists; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D050857:Synaptotagmins; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid