control-conjugates

Liu AL, Liu YF, Wang G, Shao YQ, Yu CX, Yang Z, Zhou ZR, Han X, Gong X, Qian KW, Wang LQ, Ma YY, Zhong YM, Weng SJ, Yang XL (2022) The role of ipRGCs in ocular growth and myopia development. Sci Adv 8(23):eabm9027. doi: 10.1126/sciadv.abm9027 PMID: 35675393

Objective: To provide evidence in a mouse model to demonstrate that intrinsically photosensitive retinal ganglion cells (ipRGCs) make a considerable contribution to the establishment of the ocular refractive system.

Summary: The involvement of ipRGCs in mouse refractive development was investigated with selective ipRGC ablation using Melanopsin-SAP. The authors found that ipRGCs are substantially involved in ocular refractive development in mice, which is crucial for image-forming visual functions. This conclusion is derived from the considerable myopic refractive shifts induced in the eyes when most ipRGCs were ablated, yet they exhibited hyperopic shifts when ipRGCs were selectively activated.

Usage: C57BL/6 mice received intravitreal injection of Melanopsin-SAP (IT-44) at three concentrations [200, 400, and 800 ng, all suspended in 0.75 µl of 0.1 M PBS (pH 7.4)] at postnatal day 18; control eyes received the same volume of PBS or 400 ng of nonspecific antibody–conjugated saporin (IgG-SAP, also in 0.75 µl of PBS).

Related Products: Melanopsin-SAP (Cat. #IT-44), Rabbit IgG-SAP (Cat. #IT-35), Melanopsin Rabbit Polyclonal, affinity-purified (Cat. #AB-N39)

Krieger JP, Asker M, Van der Velden P, Börchers S, Richard JE, Maric I, Longo F, Singh A, De Larigue G, Skibicka KP (2022) Neural pathway for gut feelings: vagal interoceptive feedback from the gastrointestinal tract is a critical modulator of anxiety-like behavior. Biological Psychiatry in press. doi: 10.1016/j.biopsych.2022.04.020

Objective: To determine how the sensing of gastrointestinal state affects anxiety.

Summary: Vagal sensory signals from the gastrointestinal tract are critical for baseline and feeding-induced tuning of anxiety via the central amygdala in rats. The article results suggest vagal gut-brain signaling as a target to normalize interoception in anxiety.

Usage: 1.5 ul of CCK-SAP or Blank-SAP were delivered into each nodose ganglion at 250 ng/ul.

Related Products: CCK-SAP (Cat. #IT-31), Blank-SAP (Cat. #IT-21)

Nguyen KL, Lamerand SR, Deshpande RP, Taylor BK (2021) Featured Article: Selective ablation of IB4+ primary afferent neurons reduces mechanical and cold hyperalgesia in an EAE mouse model of multiple sclerosis. Targeting Trends 22

Related Products: IB4-SAP (Cat. #IT-10), Blank-SAP (Cat. #IT-21)

Read the featured article in Targeting Trends.

See Also:

• Nguyen KL et al. Contribution of small diameter non-peptidergic primary afferent neurons to central neuropathic pain in a new, more clinically relevant mouse model of multiple sclerosis. Neuroscience 2021 Abstracts P377/07, 2021. Society for Neuroscience, Virtual

Ancheta LR, Shramm PA, Bouajram R, Higgins D, Lappi DA (2022) Saporin as a commercial reagent: its uses and unexpected impacts in the biological sciences-tools from the plant kingdom. Toxins (Basel) 14(3):184. doi: 10.3390/toxins14030184 PMID: 35324681

Summary: Saporin is a ribosome-inactivating protein that can cause inhibition of protein synthesis and causes cell death when delivered inside a cell. Development of commercial Saporin results in a technology termed ‘molecular surgery’, with Saporin as the scalpel. Its low toxicity (it has no efficient method of cell entry) and sturdy structure make Saporin a safe and simple molecule for many purposes. The most popular applications use experimental molecules that deliver Saporin via an add-on targeting molecule. These add-ons come in several forms: peptides, protein ligands, antibodies, even DNA fragments that mimic cell-binding ligands. Cells that do not express the targeted cell surface marker will not be affected. This review will highlight some newer efforts and discuss significant and unexpected impacts on science that molecular surgery has yielded over the last almost four decades. There are remarkable changes in fields such as the Neurosciences with models for Alzheimer’s Disease and epilepsy, and game-changing effects in the study of pain and itch. Many other uses are also discussed to record the wide-reaching impact of Saporin in research and drug development.

Read complete article.

Sanna F, Bratzu J, Angioni L, Pina Sorighe M, Cocco C, Argiolas A, Melis MR (2021) Oxytocin-conjugated saporin injected into the substantia nigra of male rats alters the activity of the nigrostriatal dopaminergic system: A behavioral and neurochemical study. Brain Res 1773:147705. doi: 10.1016/j.brainres.2021.147705 PMID: 34744015

Objective: To investigate the effects of Oxytocin-SAP in the substantia nigra of male rats, and assess its impact on nigral Tyrosine Hydroxylase-immunoreactivity, dopamine content, locomotor activity, rotational turning, and striatal dopamine function.

Summary: Researchers investigated the effects of injecting oxytocin-conjugated Saporin into the substantia nigra of male rats. They found that this treatment led to changes in the activity of the nigrostriatal dopaminergic system, as evidenced by alterations in behavior and neurochemical markers associated with dopamine function.

Usage: Oxytocin-SAP (60 ng/μl and 120 ng/μl) was injected unilaterally into the substantia nigra of male rats, respectively, compared to Blank-SAP.

Related Products: Oxytocin-SAP (Cat. #IT-46), Blank-SAP (Cat. #IT-21)

Jimenez-Martin J, Potapov D, Potapov K, Knöpfel T, Empson RM (2021) Cholinergic modulation of sensory processing in awake mouse cortex. Sci Rep 11(1):17525. doi: 10.1038/s41598-021-96696-8

Objective: To decipher the timing and significance of acetylcholine actions.

Summary: Study provides new insights into how the cortex processes sensory information and how loss of acetylcholine, for example in Alzheimer’s Disease, disrupts sensory behaviours.

Usage: Focal cortical injection of mu p75-SAP or Rabbit IgG-SAP (1.7 mg/ml, 0.3 µl total volume, rate 0.075 µl/minute).

Related Products: mu p75-SAP (Cat. #IT-16), Rabbit IgG-SAP (Cat. #IT-35)

Maejima Y, Yokota S, Shimizu M, Horita S, Kobayashi D, Hazama A, Shimomura K (2021) The deletion of glucagon-like peptide-1 receptors expressing neurons in the dorsomedial hypothalamic nucleus disrupts the diurnal feeding pattern and induces hyperphagia and obesity. Nutr Metab (Lond) 18(1):58. doi: 10.1186/s12986-021-00582-z PMID: 34098999

Objective: To determine whether GLP-1 receptor-positive neurons play a role in feeding patterns and obesity.

Summary: Feeding rhythm disruption contributes to the development of obesity. GLP-1 receptors (GLP-1R) are expressed in the dorsomedial hypothalamic nucleus (DMH) which are known to be associated with thermogenesis and circadian rhythm development. These findings suggest that GLP-1R expressing neurons in the DMH may mediate feeding termination.

Usage: Exenatide-SAP targets GLP-1R expressing cells. Injections of 0.1 μg/0.5 μl Ex4-SAP or 0.1 μg/0.5 μl Blank-SAP (control) were administered into the DMH.

Related Products: Ex4-SAP (GLP-1-SAP) (Cat. #IT-90), Blank-SAP (Cat. #IT-21)

Loftén A, Adermark L, Ericson M, Söderpalm B (2021) An acetylcholine-dopamine interaction in the nucleus accumbens and its involvement in ethanol’s dopamine-releasing effect. Addict Biol 26(3):e12959. doi: 10.1111/adb.12959

Summary: Basal extracellular levels of dopamine within the nucleus accumbens are not sustained by muscarinic acetylcholine, whereas accumbal Cholinergic interneurons-ACh are involved in mediating ethanol-induced dopamine release.

Usage: Anti-ChAT-SAP or Rabbit IgG-SAP were infused at a flow rate of 0.05 μl/min for 10 min giving a total volume of 0.5 μl.

Related Products: Anti-ChAT-SAP (Cat. #IT-42), Rabbit IgG-SAP (Cat. #IT-35)

Wang Z, Jiang C, Yao H, Chen O, Rahman S, Gu Y, Zhao J, Huh Y, Ji RR (2021) Central opioid receptors mediate morphine-induced itch and chronic itch via disinhibition. Brain 144(2):665-681. doi: 10.1093/brain/awaa430

Summary: Itch is a common side effect of opioids, particularly as a result of epidural or intrathecal administration. Notably, morphine-elicited itch was suppressed by intrathecal administration of NPY and abolished by spinal ablation of GRPR+ neurons with intrathecal injection of Bombesin-SAP.

Usage: For ablation of GRPR+ neurons, mice were given an intrathecal injection of 400 ng Bombesin-SAP or Blank-SAP (control) 10 days before behavioral testing.

Related Products: Bombesin-SAP (Cat. #IT-40), Blank-SAP (Cat. #IT-21)

Meng QT, Liu XY, Liu XT, Barry DM, Jin H, Sun Y, Yang Q, Wan L, Jin JH, Shen kF, Munanairi A, Kim R, Yin J, Tao A, Chen ZF (2021) BNP facilitates NMB-mediated histaminergic itch via NPRC-NMBR crosstalk. bioRxiv 2021.01.26.428310. doi: 10.1101/2021.01.26.428310

Related Products: Nppb-SAP (Cat. #IT-69), Blank-SAP (Cat. #IT-21)