targeted-toxins

Souza GMPR, Kanbar R, Stornetta DS, Abbott SBG, Stornetta RL, Guyenet PG (2018) Breathing regulation and blood gas homeostasis after near complete lesions of the retrotrapezoid nucleus in adult rats. J Physiol 596(13):2521-2545. doi: 10.1113/JP275866

Objective: To test how important the retrotrapezoid nucleus (RTN) is to PCO2 homeostasis and breathing during sleep or wake.

Summary: Near complete RTN destruction in rats virtually eliminates the CRC but HVR persists and sighing and the state-dependence of breathing are unchanged. Under normoxia, RTN lesions cause no change in VE but alveolar ventilation is reduced by at least 21%, probably because of increased physiological dead volume. RTN lesions do not cause sleep apnea during SWS, even under hyperoxia.

Usage: A total of 6 microinjections (120 nl/injection; 3 rostrocaudally aligned injections per side) were made 100-200 μm below the lower edge of the facial motor nucleus 2 mm lateral to the midline. Experimental rats received either 0.6 ng, 1.2 ng, or 2.4 ng of SSP-SAP per injection.

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

Ritter S (2018) Why I can’t say “no” to hindbrain catecholamine neurons. Appetite 126:210. doi: 10.1016/j.appet.2018.02.035

Related Products: Anti-DBH-SAP (Cat. #IT-03)

Suarez AN, Hsu TM, Liu CM, Noble EE, Cortella AM, Nakamoto EM, Hahn JD, de Lartigue G, Kanoski SE (2018) Gut vagal sensory signaling regulates hippocampus function through multi-order pathways. Nat Commun 9(1):2181. doi: 10.1038/s41467-018-04639-1

Objective: To determine the  endogenous relevance of GIderived vagal HPC communication.

Summary: Endogenous derived vagal sensory signaling promotes HPC-dependent memory function via a multi-order brainstem–septal pathway, thereby identifying a previously unknown role for the gut–brain axis in memory control.

Usage: A 1-µl volume of CCK-SAP (250 ng/µl) or control Saporin (250 ng/µl) was injected at two sites: 0.5 µl rostral and 0.5 µl caudal to the laryngeal nerve branch.

Related Products: CCK-SAP (Cat. #IT-31), Saporin (Cat. #PR-01)

Staib JM, Della Valle R, Knox DK (2018) Disruption of medial septum and diagonal bands of Broca cholinergic projections to the ventral hippocampus disrupt auditory fear memory. Learn Mem 152:71-79. doi: 10.1016/j.nlm.2018.05.009

Objective: To determine which efferent projections are critical for contextual fear memory discrimination and extinction memory.

Summary: The results of this study suggest that MS/vDBB cholinergic neurons are critical for fear and extinction memory.

Usage: 192-IgG saporin was infused into all brain regions at a concentration of 0.2 μg/μL dissolved in 0.2 M PBS. The total volume of each injection was 0.5 μL. Sham surgeries were accomplished using the same volume (0.5 μL) of PBS.

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

Araldi D, Ferrari LF, Levine JD (2018) Role of GPCR (mu-opioid)-receptor tyrosine kinase (epidermal growth factor) crosstalk in opioid-induced hyperalgesic priming (type II). Pain 159(5):864-875. doi: 10.1097/j.pain.0000000000001155

Objective: To determine the the mechanisms mediating the induction of opioid-induced hyperalgesia and the prolongation of prostaglandinE2-induced hyperalgesia in type II hyperalgesic priming.

Summary: Understanding the mechanisms responsible for the induction of type II hyperalgesic priming, a form of neuroplasticity in the peripheral terminal of the primary afferent nociceptor, may provide useful information for the design of drugs with improved therapeutic profiles to treat neuroplasticity induced by chronic use of opioids.

Usage: SSP-SAP was prepared in saline (5 ng/mL), and 20 mL was injected intrathecally into rats, 14 days before nociceptive tests.

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

Cho JS, Lee J, Jeong DU, Kim HW, Chang WS, Moon J, Chang JW (2018) Effect of placenta-derived mesenchymal stem cells in a dementia rat model via microglial mediation: A comparison between stem cell transplant methods. Yonsei Med J 59:406-415. doi: 10.3349/ymj.2018.59.3.406

Objective: To study the therapeutic effects of human placenta-derived mesenchymal stem cells (pMSCs) in a dementia rat model using either intracerebroventricular (ICV) or intravenous (IV) injections and analyze their mechanisms of therapeutic action.

Summary: ICV and IV injections of pMSCs facilitate the recovery of cholinergic neuronal populations and cognitive behavior. This recovery likely occurs through paracrine effects that resemble microglia function rather than direct differentiation of injected pMSCs into cholinergic neurons.

Usage: Dementia modeling was established by bilateral ventricle infusion of 192 IgG-SAP to lesion cholinergic neurons. 8 μL of 192 IgG-saporin (0.63 μg/μL) were bilaterally injected into the lateral ventricle at a rate of 1 μL/min and was left to diffuse for 5 min after injection. Rats were subjected to the Morris water maze and subsequent immunostaining analyses.

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

Vetter I (2018) Toxins in Neurobiology: New tools from old molecules. Neurosci Lett 679:1-3. doi: 10.1016/j.neulet.2018.05.008

Summary: The selective ablation of neurokinin-1 receptor-expressing neurons by SP-SAP revealed a key role for the preBötzinger complex in the generation of respiratory rhythm. Toxin-mediated neuronal ablation may also find therapeutic applications, such as the treatment of severe refractory pain in terminally ill patients by intrathecal SP-SAP which causes selective loss of neurokinin-1 receptor-expressing neurons in the spinal cord dorsal horn.

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

Sanvanson P, Li Z, Ward BD, Shaker R (2018) Mo1545 – Vagal nerve modulates the effects of esophageal acid on the periaqueductal gray functional connectivity in a rat model. Gastroenterology 154:S-747-S-748. doi: 10.1016/S0016-5085(18)32596-4

Related Products: Anti-DBH-SAP (Cat. #IT-03)

Winston J (2018) Mo1546 – Neonatal colon inflammation-induced increases in pituitary adenylate cyclase activating peptide expression in the parabrachial nucleus contributes to reduced meal consumption, to increased meal-induced aversive and anxiety-like behaviors in adult rats. Gastroenterology 154:S-748. doi: 10.1016/S0016-5085(18)32597-6

Summary: Infusion of Anti-DBH-SAP into the dorsal vagal complex significantly increased meal volumes and increased open field activity compared to IgG-saporin treatment.

Related Products: Anti-DBH-SAP (Cat. #IT-03)

Pintus R, Riggi M, Cannarozzo C, Valeri A, de Leo G, Romano M, Gulino R, Leanza G (2018) Essential role of hippocampal noradrenaline in the regulation of spatial working memory and TDP‐43 tissue pathology. J Comp Neurol 526:1131-1147. doi: 10.1002/cne.24397

Objective: To determine the noradrenergic contribution to cognitive and histopathological changes in Alzheimer’s Disease.

Summary: Integrity of ascending noradrenergic inputs to the hippocampus may be required for the regulation of specific aspects of learning and memory and to prevent TDP-43 tissue pathology.

Usage: Anti-DBH-SAP was used at a dose of 0.50 µg dissolved in sterile PBS.

Related Products: Anti-DBH-SAP (Cat. #IT-03)