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All-trans retinoic acid-triggered antimicrobial activity against Mycobacterium tuberculosis is dependent on NPC2.
Wheelwright, Matthew; Kim, Elliot W; Inkeles, Megan S; De Leon, Avelino; Pellegrini, Matteo; Krutzik, Stephan R; Liu, Philip T.
Afiliación
  • Wheelwright M; Division of Dermatology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA 90095.
  • Kim EW; Division of Dermatology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA 90095.
  • Inkeles MS; Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095.
  • De Leon A; UCLA and Orthopaedic Hospital Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, Los Angeles, CA 90095.
  • Pellegrini M; Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90095.
  • Krutzik SR; Division of Dermatology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA 90095.
  • Liu PT; Division of Dermatology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA 90095.
J Immunol ; 192(5): 2280-2290, 2014 Mar 01.
Article en En | MEDLINE | ID: mdl-24501203
A role for vitamin A in host defense against Mycobacterium tuberculosis has been suggested through epidemiological and in vitro studies; however, the mechanism is unclear. In this study, we demonstrate that vitamin A-triggered antimicrobial activity against M. tuberculosis requires expression of NPC2. Comparison of monocytes stimulated with all-trans retinoic acid (ATRA) or 1,25-dihydroxyvitamin D3 (1,25D3), the biologically active forms of vitamin A and vitamin D, respectively, indicates that ATRA and 1,25D3 induce mechanistically distinct antimicrobial activities. Stimulation of primary human monocytes with ATRA did not result in expression of the antimicrobial peptide cathelicidin, which is required for 1,25D3 antimicrobial activity. In contrast, ATRA triggered a reduction in the total cellular cholesterol concentration, whereas 1,25D3 did not. Blocking ATRA-induced cellular cholesterol reduction inhibits antimicrobial activity as well. Bioinformatic analysis of ATRA- and 1,25D3-induced gene profiles suggests that NPC2 is a key gene in ATRA-induced cholesterol regulation. Knockdown experiments demonstrate that ATRA-mediated decrease in total cellular cholesterol content and increase in lysosomal acidification are both dependent upon expression of NPC2. Expression of NPC2 was lower in caseous tuberculosis granulomas and M. tuberculosis-infected monocytes compared with normal lung and uninfected cells, respectively. Loss of NPC2 expression ablated ATRA-induced antimicrobial activity. Taken together, these results suggest that the vitamin A-mediated antimicrobial mechanism against M. tuberculosis requires NPC2-dependent expression and function, indicating a key role for cellular cholesterol regulation in the innate immune response.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tretinoina / Tuberculosis Pulmonar / Glicoproteínas / Monocitos / Proteínas Portadoras / Mycobacterium tuberculosis / Antineoplásicos Límite: Female / Humans / Male Idioma: En Revista: J Immunol Año: 2014 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tretinoina / Tuberculosis Pulmonar / Glicoproteínas / Monocitos / Proteínas Portadoras / Mycobacterium tuberculosis / Antineoplásicos Límite: Female / Humans / Male Idioma: En Revista: J Immunol Año: 2014 Tipo del documento: Article Pais de publicación: Estados Unidos