tt2005

Ross RS, McGaughy J, Eichenbaum H (2005) Acetylcholine in the orbitofrontal cortex is necessary for the acquisition of a socially transmitted food preference. Learn Mem 12(3):302-306. doi: 10.1101/lm.91605

Summary: Cortical involvement in social transmission of food preference (STFP) has not been established, but the importance of the orbitofrontal cortex (OFC) in odor-guided learning is known. The OFC of rats was injected twice with 192-Saporin (Cat. #IT-01), then the rats were trained in STFP. Depletion of cholinergic neurons in the OFC impaired expression of the odor association, indicating that cholinergic function in the OFC is essential for this form of associative learning.

Related Products: 192-IgG-SAP (Cat. #IT-01)

Chiken S, Tokuno H (2005) Impairment of skilled forelimb use after ablation of striatal interneurons expressing substance P receptors in rats: an analysis using a pasta matrix reaching task. Exp Brain Res 162(4):532-536. doi: 10.1007/s00221-004-2189-2

Summary: The substance P receptor is expressed by two types of interneurons in the striatum. The authors investigated whether elimination of these neurons would impair motor control by the basal ganglia. Rats were treated with 7.5 ng injections of SP-SAP (Cat. #IT-07) into the dorsolateral part of the striatum. Lesioned animals did not perform as well as controls in a test measuring accurate reaching with the forepaw. The data show that striatal interneurons expressing the substance P receptor are necessary for accurate reaching.

Related Products: SP-SAP (Cat. #IT-07)

Bugarith K, Dinh TT, Li AJ, Speth RC, Ritter S (2005) Basomedial hypothalamic injections of neuropeptide Y conjugated to saporin selectively disrupt hypothalamic controls of food intake. Endocrinology 146(3):1179-1191. doi: 10.1210/en.2004-1166

Summary: The authors examined the effect of 48 ng injections of NPY-SAP (Cat. #IT-28) into the basomedial hypothalamus (BMH) on glucoprivic feeding in rats. While there was no evidence of retrograde transport, the lesions inhibited responses to intracerebroventricular leptin and ghrelin. Neither the feeding nor the hyperglycemic response to 2-deoxy-D-glucose was affected by the lesion, indicating that these hindbrain processes do not utilize neurons in the BMH. This work also describes dosing and injection parameter studies for the use of NPY-SAP.

Related Products: NPY-SAP (Cat. #IT-28), Blank-SAP (Cat. #IT-21)

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Seki S, Erickson KA, Seki M, Nishizawa O, Igawa Y, Ogawa T, de Groat WC, Chancellor MB, Yoshimura N (2005) Elimination of rat spinal neurons expressing neurokinin 1 receptors reduces bladder overactivity and spinal c-fos expression induced by bladder irritation. Am J Physiol Renal Physiol 288(3):F466-F473. doi: 10.1152/ajprenal.00274.2004

Summary: Substance P is reported to play a role in the micturition reflex as well as in nociceptive responses. The authors investigated the role that neurokinin-1 receptor-expressing cells in the spinal cord play in the micturition reflex of rats. 8 µl of 1.0 or 1.5 µM SSP-SAP (Cat. #IT-11) was injected into the L6-S1 level of the spinal cord, and cystometric parameters were measured before and after capsaicin administration to the bladder. Lesioned animals did not display the bladder overactivity normally seen in the presence of capsaicin.

Related Products: SSP-SAP (Cat. #IT-11)

Gil-Bea FJ, Garcia-Alloza M, Dominguez J, Marcos B, Ramirez MJ (2005) Evaluation of cholinergic markers in Alzheimer’s disease and in a model of cholinergic deficit. Neurosci Lett 375(1):37-41. doi: 10.1016/j.neulet.2004.10.062

Summary: Several markers of cholinergic function may be able to predict cognitive deficits due to disorders such as Alzheimer’s disease. The authors compared baseline measurements of acetylcholine, cholinacetyltransferase, and acetylcholinesterase (AChE) of rats against animals treated with 0.067 µg injections of 192-Saporin (Cat. #IT-01) into both hemispheres of the nucleus basalis magnocellularis. The results indicate that measurement of AChE activity is an inexpensive and reliable method to evaluate cholinergic function in rats as well as in humans.

Related Products: 192-IgG-SAP (Cat. #IT-01)

Nolan BC, Freeman JH Jr (2005) Purkinje cell loss by OX7-saporin impairs excitatory and inhibitory eyeblink conditioning. Behav Neurosci 119(1):190-201. doi: 10.1037/0735-7044.119.1.190

Summary: Although the contributions of the cortical cerebellum to eyeblink-conditioned excitation have been extensively investigated, involvement in inhibition of this reflex is unclear. After intracerebroventricular infusions of 15.0 µg of OX7-SAP (Cat. #IT-02), rats displayed impaired retention and savings of preinfusion excitatory conditioning, indicating that the Purkinje cells that were eliminated by OX7-SAP are essential for maintenance of excitatory eyeblink conditioning. Inhibition is not prevented by loss of these Purkinje cells, suggesting that extracerebellar structures play a critical role in this process.

Related Products: OX7-SAP (Cat. #IT-02)

Khasabov SG, Ghilardi JR, Mantyh PW, Simone DA (2005) Spinal neurons that express NK-1 receptors modulate descending controls that project through the dorsolateral funiculus. J Neurophysiol 93(2):998-1006. doi: 10.1152/jn.01160.2003

Summary: The involvement of neurokinin-1 receptor-expressing neurons in the spinal cord with the ascending systems of hyperalgesia and central sensitization has been well established. The authors used 10 µl injections of 5 µM SP-SAP (Cat. #IT-07) into the intrathecal space of rats, and examined the descending systems that travel via the dorsolateral funiculus (DLF). While SP-SAP alone had no effect, administration of SP-SAP in conjunction with a DLF transection enhanced neuronal responses to mechanical and heat stimuli.

Related Products: SP-SAP (Cat. #IT-07)

Harrell LE, Parsons DS, Kolasa K (2005) The effect of central cholinergic and noradrenergic denervation on hippocampal sympathetic ingrowth and apoptosis-like reactivity in the rat. Brain Res 1033(1):68-77. doi: 10.1016/j.brainres.2004.11.021

Summary: Cholinergic denervation of the hippocampus is followed by ingrowth of peripheral sympathetic fibers originating from the superior cervical ganglion. The authors injected 1 µg of 192-Saporin (Cat. #IT-01) into the medial septum of rats along with a noradrenergic fiber neurotoxin to investigate whether the noradrenergic system was involved with this ingrowth as well. The data provide more evidence that hippocampal sympathetic ingrowth can be stimulated by cholinergic denervation alone.

Related Products: 192-IgG-SAP (Cat. #IT-01)

Turchi J, Saunders RC, Mishkin M (2005) Effects of cholinergic deafferentation of the rhinal cortex on visual recognition memory in monkeys. Proc Natl Acad Sci U S A 102(6):2158-2161. doi: 10.1073/pnas.0409708102

Summary: The rhinal cortex has been shown to play a critical role in recognition memory. The investigators examined the effect of eliminating cholinergic input to the rhinal cortex on the formation of new visual memories in macaques. Animals were given 0.01 µg injections of ME20.4-SAP (Cat. #IT-15) into the perirhinal and entorhinal cortices. The selective cholinergic deafferentation produced a substantial impairment of visual recognition memory, suggesting that cholinergic activation is essential for the formation of new visual memories.

Related Products: ME20.4-SAP (Cat. #IT-15)

Marques Pereira P, Cosquer B, Schimchowitsch S, Cassel JC (2005) Hebb-Williams performance and scopolamine challenge in rats with partial immunotoxic hippocampal cholinergic deafferentation. Brain Res Bull 64(5):381-394. doi: 10.1016/j.brainresbull.2004.09.007

Summary: Much of the recent work done on the role of cholinergic neurons in the hippocampus has been focused on detecting subtle learning deficits. In this study, the authors investigated the effect of 0.368 µg of 192-Saporin (Cat. #IT-01) administered to the medial septum of rats in four injections. A complex learning task, the Hebb-Williams maze, was used to define small deficits in the learning performance of the lesioned animals prior to, and after the injection of scopolamine.

Related Products: 192-IgG-SAP (Cat. #IT-01)