Categorical QSAR models for skin sensitization based on local lymph node assay measures and both ground and excited state 4D-fingerprint descriptors
Journal
Journal of Computer-Aided Molecular Design
Journal Volume
22
Journal Issue
6-7
Pages
345-366
Date Issued
2008
Author(s)
Liu, J.
Kern, P.S.
Gerberick, G.F.
Santos-Filho, Osvaldo A.
Esposito, Emilio X.
Hopfinger, Anton J.
Abstract
In previous studies we have developed categorical QSAR models for predicting skin-sensitization potency based on 4D-fingerprint (4D-FP) descriptors and in vivo murine local lymph node assay (LLNA) measures. Only 4D-FP derived from the ground state (GMAX) structures of the molecules were used to build the QSAR models. In this study we have generated 4D-FP descriptors from the first excited state (EMAX) structures of the molecules. The GMAX, EMAX and the combined ground and excited state 4D-FP descriptors (GEMAX) were employed in building categorical QSAR models. Logistic regression (LR) and partial least square coupled logistic regression (PLS-CLR), found to be effective model building for the LLNA skin-sensitization measures in our previous studies, were used again in this study. This also permitted comparison of the prior ground state models to those involving first excited state 4D-FP descriptors. Three types of categorical QSAR models were constructed for each of the GMAX, EMAX and GEMAX datasets: a binary model (2-state), an ordinal model (3-state) and a binary-binary model (two-2-state). No significant differences exist among the LR 2-state model constructed for each of the three datasets. However, the PLS-CLR 3-state and 2-state models based on the EMAX and GEMAX datasets have higher predictivity than those constructed using only the GMAX dataset. These EMAX and GMAX categorical models are also more significant and predictive than corresponding models built in our previous QSAR studies of LLNA skin-sensitization measures. © Springer Science+Business Media B.V. 2008.
Subjects
Categorica lQSAR models; Excited state structures; Skin sensitization
SDGs
Other Subjects
1,4 benzoquinone; 2 mercaptobenzothiazole; 6 methylcoumarin; abietic acid; acrylic acid ethyl ester; benzaldehyde; benzocaine; benzyl benzoate; butanol; chlorobenzene; chlorpromazine; cinnamyl alcohol; coumarin; estragole; gallic acid propyl ester; glycerol; hexane; hydroquinone; hydroxycitronellal; linalool; maleic anhydride; octanoic acid; oxalic acid; phenylenediamine; phthalic acid diethyl ester; phthalic anhydride; piperonyl butoxide; propylene glycol; sulfanilamide; 4D fingerprint descriptor; accuracy; analytic method; chemical model; chemical structure; classification; conference paper; data base; local lymph node assay; logistic regression analysis; prediction; priority journal; quantitative structure activity relation; sensitivity and specificity; skin allergy; skin sensitization; Humans; Logistic Models; Lymph Nodes; Models, Molecular; Quantitative Structure-Activity Relationship; Skin
Type
conference paper
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