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Mechanism of αKtx12 peptide on hippocampus

ABSTRACT: Voltage-gated potassium (Kv) channels, integral to cellular repolarization, are potential therapeutic targets in neuroinflammatory disorders and neurodegenerative diseases. The Kv1.3 channel, pivotal in microglial activation and striatal cholinergic interneurons (SCINs) excitability, has garnered attention. This study explores oneTityus bahiensis scorpion venom peptide, identified as αKtx12 a potent inhibitor of Kv1.3, Kv1.2, and Shaker subtypes. In SH-SY5Y cells, αKtx12 significantly enhances viability, validating its pharmacological potential. Animal models elucidate αKtx12's CNS mechanism. Neuroproteomic analyses highlight αKtx12 as a valuable tool for characterizing neuroplasticity and neurotrophism, revealing its ability to elicit more physiological responses than mere electrical impediments. The peptide's potential to promote cellular proliferation and neuroprotection suggests a role in functional recovery from nervous system injury or disease.

ORGANISM(S): Rattus Norvegicus Tityus Bahiensis

SUBMITTER: Emidio Beraldo Neto

PROVIDER: PXD049423 | JPOST Repository | Fri Feb 16 00:00:00 GMT 2024

REPOSITORIES: jPOST

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			Action	DRS
	alphaKTX12-ID.zip	Other
	amostra%20-1_GA2_01_947.d.zip	Other
	amostra%20-2_GA3_01_948.d.zip	Other
	amostra-3_GA4_01_949.d.zip	Other
	hipocampo%206-labelfree.zip	Other

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Project description:Background: SH-SY5Y cells exhibit a neuronal phenotype when treated with all-trans retinoic acid (RA), but the molecular mechanism of activation in the signaling pathway mediated by phosphatidylinositol 3-kinase (PI3K) is not sufficiently understood. To shed new light on the mechanism, we comprehensively compared the gene expression profiles between SK-N-SH cells and two subtypes of SH-SY5Y cells (SH-SY5Y-A and SH-SY5Y-E), each of which showed a different phenotype during RA-mediated differentiation. Results: SH-SY5Y-A cells differentiated in the presence of RA, whereas RA-treated SH-SY5Y-E cells required additional treatment with brain-derived neurotrophic factor (BDNF) for full differentiation. In combination with perturbation using a PI3K inhibitor, LY294002, we identified 386 genes and categorized them into two clusters dependent on the PI3K signaling pathway during RA-mediated differentiation in SH-SY5Y-A cells. Transcriptional regulation of the gene cluster was greatly reduced in SK-N-SH cells or partially impaired in SH-SY5Y-E cells in coincidence with a defect in the neuronal phenotype of these cell lines. Additional stimulation with BDNF induced a set of neural genes which were down-regulated in RA-treated SH-SY5Y-E cells but were abundant in the differentiated SH-SY5Y-A cells. Conclusions: We identified the gene clusters controlled by PI3K- and TRKB-mediated signaling pathways during differentiation in two subtypes of SH-SY5Y cells. TRKB-mediated bypass pathway compensates for the impaired neural functions generated by defects in several signaling pathways including PI3K in SH-SY5Y-E cells. The expression profiling data are useful for further studies to elucidate the signal transduction-transcriptional network including PI3K and/or TRKB. Experiment Overall Design: Human neuroblastomas, SK-N-SH (HTB-11) and SH-SY5Y-A cells (CRL-2266) were obtained from the American Type Culture Collection (ATCC). We also obtained SH-SY5Y-E cells (EC94030304) from the European Collection of Cell Cultures (ECACC). Tissue culture cells were maintained in D-MEM/F12 1:1 mixture supplemented with 15% FBS (Fetal Bovine Serum) and 1% NEAA (Non-essential amino acid) in a 5% CO2 humidified incubator at 37oC. The culture medium was changed twice a week. For the RA-inducible experiment, random culture cells from two clone subtypes of SH-SY5Y and SK-N-SH were seeded in laminin coated culture dishes (BioCoat Laminin Cellware; BD Biosciences, Billerica, MA, USA) for 1 day and then transferred to a medium containing 10 μM of RA in the presence or the absence of LY294002 (10μM) for five days. For BDNF-induced sequential differentiation of the SH-SY5Y-E strain, cells were washed with D-MEM/F12 twice after five days in the presence of RA and then incubated with 50 ng/ml of BDNF in D-MEM/F12 without serum for three days.

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Mechanism of αKtx12 peptide on hippocampus

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