Between SAT and CSP: Propositional satisfaction problems and clausal CSPs
ECAI 1998: 13TH EUROPEAN CONFERENCE ON ARTIFICIAL INTELLIGENCE, PROCEEDINGS
Authors: Castell, T; Fargier, H
Abstract
This paper proposes a unification of the SAT and CSP frameworks that simplifies the bridges that exist between the two formalisms. The main difference between lies in the syntactic characteristics of the problems solved (CNF on one side, uniform CDNF on the other). The common point between the two approaches, i.e. the solving of clausal CSPs, suits the handling of implicative constraints. The study of such clausal problems leads to introduce in the context of constraint satisfaction important SAT algorithms like the resolution principle and the "Davis and Putnam" procedure, and extends the notion of Horn clause to finite domains.
Mesencephalic Astrocyte-Derived Neurotrophic Factor (MANF) Regulates Neurite Outgrowth Through the Activation of Akt/mTOR and Erk/mTOR Signaling Pathways
FRONTIERS IN MOLECULAR NEUROSCIENCE
Authors: Wen, Wen; Wang, Yongchao; Li, Hui; Xu, Hong; Xu, Mei; Frank, Jacqueline A.; Ma, Murong; Luo, Jia
Abstract
Neurite outgrowth is essential for brain development and the recovery of brain injury and neurodegenerative diseases. In this study, we examined the role of the neurotrophic factor MANF in regulating neurite outgrowth. We generated MANF knockout (KO) neuro2a (N2a) cell lines using clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 and demonstrated that MANF KO N2a cells failed to grow neurites in response to RA stimulation. Using MANF siRNA, this finding was confirmed in human SH-SY5Y neuronal cell line. Nevertheless, MANF overexpression by adenovirus transduction or addition of MANF into culture media facilitated the growth of longer neurites in RA-treated N2a cells. MANF deficiency resulted in inhibition of Akt, Erk, mTOR, and P70S6, and impaired protein synthesis. MANF overexpression on the other hand facilitated the growth of longer neurites by activating Akt, Erk, mTOR, and P70S6. Pharmacological blockade of Akt, Erk or mTOR eliminated the promoting effect of MANF on neurite outgrowth. These findings suggest that MANF positively regulated neurite outgrowth by activating Akt/mTOR and Erk/mTOR signaling pathways.