Immunosuppressive but Non-LasR-Inducing Analogues of the Pseudomonas aeruginosa Quorum-Sensing Molecule N-(3-Oxododecanoyl)-l-homoserine Lactone
摘要:
The Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)-l-homoserine lactone (1) is involved not only in bacterial activation but also in subversion of the host immune system, and this compound might thus be used as a template to design immunosuppressive agents, provided derivatives devoid of quorum-sensing activity could be discovered. By use of a leukocyte proliferation assay and a newly developed bioluminescent P. aeruginosa reporter assay, systematic modification of 1 allowed us to delineate the bacterial LasR-induction and host immunosuppressive activities. The main determinant is replacement of the methylene group proximal to the beta-ketoamide in the acyl chain of 1 with functions containing heteroatoms, especially an NH group. This modification can be combined with replacement of the homoserine lactone system in 1 with stable cyclic groups. For example, we found the simple compound N(1)-(5-chloro-2-hydroxyphenyl)-N(3)-octylmalonamide (25d) to be over twice as potent as 1 as an immune suppressor while displaying LasR-induction antagonist activity.
Immunosuppressive but Non-LasR-Inducing Analogues of the Pseudomonas aeruginosa Quorum-Sensing Molecule N-(3-Oxododecanoyl)-l-homoserine Lactone
摘要:
The Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)-l-homoserine lactone (1) is involved not only in bacterial activation but also in subversion of the host immune system, and this compound might thus be used as a template to design immunosuppressive agents, provided derivatives devoid of quorum-sensing activity could be discovered. By use of a leukocyte proliferation assay and a newly developed bioluminescent P. aeruginosa reporter assay, systematic modification of 1 allowed us to delineate the bacterial LasR-induction and host immunosuppressive activities. The main determinant is replacement of the methylene group proximal to the beta-ketoamide in the acyl chain of 1 with functions containing heteroatoms, especially an NH group. This modification can be combined with replacement of the homoserine lactone system in 1 with stable cyclic groups. For example, we found the simple compound N(1)-(5-chloro-2-hydroxyphenyl)-N(3)-octylmalonamide (25d) to be over twice as potent as 1 as an immune suppressor while displaying LasR-induction antagonist activity.
[EN] The substituted N-acyl homoserine lactones have the formula (I) wherein R is a saturated or unsaturated straight chain or branched chain aliphatic hydrocarbyl group containing from 5 to 14 carbon atoms; R2 is H or a 1-4C alkyl group; R3 is H or F; and any enantiomer thereof. These compounds exhibit immunosuppressant activity while exhibiting reduced biosensor (autoinducer) activity compared to known N-acyl homoserine lactones. [FR] L'invention concerne des lactones N-acyle homosérine substituées de formule I (Formule I), dans laquelle R représente un groupement hydrocarbyle aliphatique à chaîne linéaire ou ramifiée, saturé ou insaturé, contenant de 5 à 14 atomes de carbone; R2 représente H ou un groupement alkyle ayant de 1 à 4 atomes de carbone; R3 représente H ou F; et leurs énantiomères. Ces composés présentent une activité d'immunosuppresseurs tout en ayant une activité de biocapteurs (autoinducteurs) réduite en comparaison des lactones N-acyle homosérine connues.
Immunosuppressive but Non-LasR-Inducing Analogues of the <i>Pseudomonas aeruginosa</i> Quorum-Sensing Molecule <i>N</i>-(3-Oxododecanoyl)-<scp>l</scp>-homoserine Lactone
作者:Gopal P. Jadhav、Siri Ram Chhabra、Gary Telford、Doreen S. W. Hooi、Karima Righetti、Paul Williams、Barrie Kellam、David I. Pritchard、Peter M. Fischer
DOI:10.1021/jm2001019
日期:2011.5.12
The Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)-l-homoserine lactone (1) is involved not only in bacterial activation but also in subversion of the host immune system, and this compound might thus be used as a template to design immunosuppressive agents, provided derivatives devoid of quorum-sensing activity could be discovered. By use of a leukocyte proliferation assay and a newly developed bioluminescent P. aeruginosa reporter assay, systematic modification of 1 allowed us to delineate the bacterial LasR-induction and host immunosuppressive activities. The main determinant is replacement of the methylene group proximal to the beta-ketoamide in the acyl chain of 1 with functions containing heteroatoms, especially an NH group. This modification can be combined with replacement of the homoserine lactone system in 1 with stable cyclic groups. For example, we found the simple compound N(1)-(5-chloro-2-hydroxyphenyl)-N(3)-octylmalonamide (25d) to be over twice as potent as 1 as an immune suppressor while displaying LasR-induction antagonist activity.