Structural studies of cord factors from Mycobacterium simiae related to the capacity for tumour necrosis factor alpha (α-TNF) induction.
The structure of cord factor was studied in several strains of Mycobacterium simiae, including 'habana' TMC 5135, considered as highly immunogenic in experimental tuberculosis and leprosy. The mycolic acids liberated from cord factor were identified in all cases as α'-, α- and keto-mycolates. According to the general NMR and MS data, α'-mycolates were mono-unsaturated and contained from 64 to 68 carbon atoms, whereas α-mycolates mainly presented two 2,3-disubstituted cyclopropane rings and a chain length of 80-91 carbon atoms; keto-mycolates mostly contained one cyclopropane ring and 85-91 carbon atoms. Taking into account the (1)H-NMR results, strains varied in the ratio of the different mycolates, and the high levels of keto-mycolates found in the cord factors of TMC 5135 and ATCC 25275(T) stood out. Notably, MS revealed that the odd carbon number series of α-mycolates (C87-C89) predominated in the cord factor of TMC 5135, in contrast to the remaining studied strains, in which the even (C84-C86) and odd carbon number series appeared more equal. The fine structural differences detected among the cord factors studied did not seem to be relevant to the general capacity of these molecules to induce the secretion of tumour necrosis factor alpha, as the cord factors from several strains of M. simiae (TMC 5135, IPK-342 and ATCC 25275(T)) induced similar amounts of this cytokine in RAW 264.7 cells.
Mederos
Lilian M
LM
Laboratorio Nacional de Referencia e Investigaciones en Tuberculosis y Micobacterias, Centro Colaborador OPS/OMS, Instituto de Medicina Tropical Pedro Kourí (IPK), La Habana, Cuba.
Montoro
Ernesto H
EH
Laboratorio Nacional de Referencia e Investigaciones en Tuberculosis y Micobacterias, Centro Colaborador OPS/OMS, Instituto de Medicina Tropical Pedro Kourí (IPK), La Habana, Cuba.
Bernabéu
Antonia
A
Sección de Cultivo de Tejidos, Servicio de Apoyo a la Investigación, Campus Universitario de Espinardo, Universidad de Murcia, Murcia, Spain.
Linares
Carlos
C
Departamento de Genética y Microbiología, Facultad de Medicina y Odontología, Campus Universitario de Espinardo, Universidad de Murcia, Murcia, Spain.
Valero-Guillén
Pedro L
PL
Departamento de Genética y Microbiología, Facultad de Medicina y Odontología, Campus Universitario de Espinardo, Universidad de Murcia, Murcia, Spain.
D000818:Animals; D002460:Cell Line; D003311:Cord Factors / Q000737:chemistry* / Q000235:genetics / Q000276:immunology*; D006801:Humans; D051379:Mice; D015394:Molecular Structure; D009161:Mycobacterium / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology* / Q000382:microbiology; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology*
D003311:Cord Factors; D014409:Tumor Necrosis Factor-alpha