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2020 Targeting Trends Review
Labeling neuronal proteins with quantum dots for single-molecule imaging
Thal LB, Kovtun O, Rosenthal SJ (2020) Labeling neuronal proteins with quantum dots for single-molecule imaging. (eds. Fontes A, Santos B). In: Quantum Dots. Methods in Molecular Biology. 2135:169-177. Humana Press, New York, NY. doi: 10.1007/978-1-0716-0463-2_9 PMID: 32246334
Objective: The authors describe how nanometer-sized fluorescent semiconductors called quantum dots (QD) can be used to label neuronal proteins in a single QD imaging format.
Usage: Secondary antibody-conjugated QDs target membrane proteins pre-treated with SERT Mouse Monoclonal.
Related Products: SERT Mouse Monoclonal (Cat. #AB-N40)
Intracerebroventricular administration of 192IgG-saporin alters the state of microglia in the neocortex.
Volobueva MN, Dobryakova YV, Manolova AO, Stepanichev MY, Kvichansky AA, Gulyaeva NV, Markevich VA, Bolshakov AP (2020) Intracerebroventricular administration of 192IgG-saporin alters the state of microglia in the neocortex. Neurochem J 14(1):37-42. doi: 10.1134/S1819712420010213
Objective: The effect of intracerebroventricular (icv) immunotoxin administration on the state of microglia in tissues adjacent to the ventricle (striatum and parietal cortex) and remotely located but receiving innervation from the medial septal region and diagonal band of Broca (entorhinal cortex and olfactory bulbs).
Summary: 1.5 months after the administration of immunotoxin, microglia are activated only in the neocortical areas, not in the striatum or olfactory bulbs.
Usage: Injected bilaterally at a dose of 4 μg in each ventricle.
Related Products: 192-IgG-SAP (Cat. #IT-01)
Cholinergic basal forebrain degeneration due to obstructive sleep apnoea increases Alzheimer’s pathology in mice.
Qian L, Kasas L, Milne MR, Rawashdeh O, Marks N, Sharma A, Bellingham MC, Coulson EJ (2020) Cholinergic basal forebrain degeneration due to obstructive sleep apnoea increases Alzheimer’s pathology in mice. bioRxiv 2020.03.12.989848. doi: 10.1101/2020.03.12.989848
Usage: bilateral injections of urotensin II-saporin (UII-SAP; 0.07 μg/μL per site – unless stated otherwise; generous gift from Advanced Targeting Systems)
Related Products: Custom Conjugates, Blank-SAP (Cat. #IT-21)
Exploration of sensory and spinal neurons expressing gastrin-releasing peptide in itch and pain related behaviors.
Barry DM, Liu XT, Liu B, Liu XY, Gao F, Zeng X, Liu J, Yang Q, Wilhelm S, Yin J, Tao A, Chen ZF (2020) Exploration of sensory and spinal neurons expressing gastrin-releasing peptide in itch and pain related behaviors. Nat Commun 11(1):1397. doi: 10.1038/s41467-020-15230-y
Objective: To determine the role of GRP in sensory neurons.
Summary: GRP is a neuropeptide in sensory neurons for nonhistaminergic itch, and GRP sensory neurons are dedicated to itch transmission.
Usage: Bombesin-SAP (200 ng/5 μL, i.t.) was injected 2 weeks prior to optical stimulation.
Related Products: Bombesin-SAP (Cat. #IT-40)
Using loss- and gain-of-function approaches to target amygdala-projecting serotonergic neurons in the dorsal raphe nucleus that enhance anxiety-related and conditioned fear behaviors.
Bernabe CS, Caliman IF, Truitt WA, Molosh AI, Lowry CA, Hay-Schmidt A, Shekhar A, Johnson PL (2020) Using loss- and gain-of-function approaches to target amygdala-projecting serotonergic neurons in the dorsal raphe nucleus that enhance anxiety-related and conditioned fear behaviors. J Psychopharmacol 34(4):400-411. doi: 10.1177/0269881119900981
Objective: To investigate the role of amygdala-projecting 5-HT neurons in the DR in innate anxiety and conditioned fear behaviors.
Summary: The studies support the hypothesis that amygdala-projecting 5-HT neurons in the DR represent an anxiety and fear-on network.
Usage: Each rat received two bilateral microinjections per site (100 nL each, 1 μM in artificial cerebrospinal fluid) of either Anti-SERT-SAP or the control Mouse IgG-SAP.
Related Products: Anti-SERT-SAP (Cat. #IT-23), Mouse IgG-SAP (Cat. #IT-18)
Inflammatory macrophages facilitate mechanical stress-induced osteogenesis.
Zhang F, Huan L, Xu T, Li G, Zheng B, Zhao H, Guo Y, Shi J, Sun J, Chen A (2020) Inflammatory macrophages facilitate mechanical stress-induced osteogenesis. Aging (Albany NY) 12(4):3617-3625. doi: 10.18632/aging.102833
Summary: In a mouse model of distraction osteogenesis (DO), there was significant increase in macrophages in the regeneration area. This suggests that targeting inflammatory macrophages may help to improve clinical bone repair.
Usage: For saporin-mediated depletion of macrophages, DO-surgery-treated mice received an intraventricular (iv) injection of either Mac-1-SAP or Rat IgG-SAP (20µg) once every 3 days.
Related Products: Mac-1-SAP mouse/human (Cat. #IT-06), Rat IgG-SAP (Cat. #IT-17)
Intervening B-type natriuretic peptide signaling for controlling chronic itch.
Meng J, Chen W, Wang J (2020) Intervening B-type natriuretic peptide signaling for controlling chronic itch. Brit J Pharmacol 177(5):1025-1040. doi: 10.1111/bph.14952
Objective: Review of recent findings used to examine the role of B-type natriuretic peptide (BNP) in itch transduction and the modulation of other pururitic proteins.
Summary: Mice treated with Nppb-SAP ablated 70% of the BNP receptor-positive neurons in the spinal cord.
Related Products: Nppb-SAP (Cat. #IT-69)
See Also:
nGnG amacrine cells and Brn3b-negative M1 ipRGCs are specifically labeled in the ChAT-ChR2-EYFP mouse.
Cui LJ, Chen WH, Liu AL, Han X, Jiang SX, Yuan F, Zhong YM, Yang XL, Weng SJ (2020) nGnG amacrine cells and Brn3b-negative M1 ipRGCs are specifically labeled in the ChAT-ChR2-EYFP mouse. Invest Ophthalmol Vis Sci 61(2):14. doi: 10.1167/iovs.61.2.14 PMID: 32049344
Summary: The authors speculated that type II cells might be ipRGCs. This was later verified by the strong immunostaining of type II cells in response to the melanopsin antibody UF006 (100%, 141 of 141 cells collected from 5 retinas, Figs. 6B1–B3), which probes multiple ipRGC subtypes.
Usage: Immunostaining 1:10000
Related Products: Melanopsin Rabbit Polyclonal (Cat. #AB-N38)
More than scratching the surface: recent progress in brain mechanisms underlying itch and scratch.
Liu X, Miao XH, Liu T (2020) More than scratching the surface: recent progress in brain mechanisms underlying itch and scratch. Neurosci Bull 36(1):85-88. doi: 10.1007/s12264-019-00352-1
Summary: The discovery of descending neural circuitry to drive the itch-scratching cycle may provide potential therapeutic targets in the central nervous system for the management of chronic itch.
Usage: To ablate the spinal GRPR+ neurons, mice were intrathecally injected with Bombesin-SAP or Blank-SAP (400 ng/5 mL).
Related Products: Bombesin-SAP (Cat. #IT-40)
Quantum dot conjugated saporin activates microglia and induces selective substantia nigra degeneration.
Landrigan J, Dwyer Z, Beauchamp S, Rodriguez R, Fortin T, Hayley S (2020) Quantum dot conjugated saporin activates microglia and induces selective substantia nigra degeneration. NeuroToxicology 76:153-161. doi: 10.1016/j.neuro.2019.11.007 PMID: 31738977
Objective: To assess the impact of Quantum Dots (QDs) alone and QDs conjugated to Saporin, on substantia nigra microglia and dopamine neurons.
Summary: QDs might be a viable route for toxicant delivery and also have an added advantage of being fluorescently visible. Ultimately, we found SNc neurons to be exceptionally vulnerable to QD-saporin and suggest that this could be a novel targeted approach to model Parkinson’s Disease-like inflammatory pathology.
Usage: Biotin-labeled saporin chicken polyclonal was mixed with QDs coated with streptavidin. 2 μl of QDs (1 μM) were mixed with 2 μL of biotinylated saporin (56 μM) and 76 μL of phosphate buffer solution was added.
Related Products: Saporin Chicken Polyclonal, affinity-purified biotin-labeled (Cat. #AB-17APBT)