TY - JOUR
T1 - In situ analysis of lung antigen-presenting cells during murine pulmonary infection with virulent Mycobacterium tuberculosis
AU - Pedroza-González, Alexander
AU - García-Romo, Gina S.
AU - Aguilar-Léon, Diana
AU - Calderon-Amador, Juana
AU - Hurtado-Ortiz, Raquel
AU - Orozco-Estevez, Hector
AU - Lambrecht, Bart N.
AU - Estrada-García, Iris
AU - Hernández-Pando, Rogelio
AU - Flores-Romo, Leopoldo
PY - 2004/6
Y1 - 2004/6
N2 - Scarce information exists about the role of lung antigen-presenting cells (APCs) in vivo during pulmonary tuberculosis. As APCs activate cellular immunity, following intratracheal inoculation with virulent Mycobacterium tuberculosis, we assessed in situ lung APC recruitment, distribution, granuloma involvement, morphology and mycobacterial burden by using MHC-CII, CD14, scavenger receptor class A (SRA), the murine dendritic cell (DC)-restricted marker CD11c and Ziehl-Neelsen staining. CD11c+ DC and CD14 + cell recruitment into lungs appeared by day 14, continuing until day 60. MHC-CII+ cells increased since day 7, persisting until day 60. Thus, virulent mycobacteria delays (14-21 days) lung APC recruitment compared to model antigens and nonvirulent bacilli (24-48 h). Regarding granuloma constitution, highly bacillary CD14+ and SRA+ cells were centrally located. MHC-CII+ cells were more peripheral, with less mycobacteria. CD11c+ cells were heterogeneously distributed within granulomas, with scarce bacilli. When labelling lung suspensions for MHC-CII and classifying cells as macrophages or DC, then staining for Ziehl-Neelsen, a remarkable segregation was found regarding bacillary burden. Most macrophage-like cells contained numerous bacilli, while DC had no or scarce mycobacteria. This implies differential APC contributions in situ during pulmonary tuberculosis regarding mycobacterial uptake, granuloma involvement and perhaps bacillary growth.
AB - Scarce information exists about the role of lung antigen-presenting cells (APCs) in vivo during pulmonary tuberculosis. As APCs activate cellular immunity, following intratracheal inoculation with virulent Mycobacterium tuberculosis, we assessed in situ lung APC recruitment, distribution, granuloma involvement, morphology and mycobacterial burden by using MHC-CII, CD14, scavenger receptor class A (SRA), the murine dendritic cell (DC)-restricted marker CD11c and Ziehl-Neelsen staining. CD11c+ DC and CD14 + cell recruitment into lungs appeared by day 14, continuing until day 60. MHC-CII+ cells increased since day 7, persisting until day 60. Thus, virulent mycobacteria delays (14-21 days) lung APC recruitment compared to model antigens and nonvirulent bacilli (24-48 h). Regarding granuloma constitution, highly bacillary CD14+ and SRA+ cells were centrally located. MHC-CII+ cells were more peripheral, with less mycobacteria. CD11c+ cells were heterogeneously distributed within granulomas, with scarce bacilli. When labelling lung suspensions for MHC-CII and classifying cells as macrophages or DC, then staining for Ziehl-Neelsen, a remarkable segregation was found regarding bacillary burden. Most macrophage-like cells contained numerous bacilli, while DC had no or scarce mycobacteria. This implies differential APC contributions in situ during pulmonary tuberculosis regarding mycobacterial uptake, granuloma involvement and perhaps bacillary growth.
KW - APC
KW - DCs and macrophages
KW - Lung
KW - Mycobacterium tuberculosis
KW - Pulmonary tuberculosis
UR - http://www.scopus.com/inward/record.url?scp=3843053687&partnerID=8YFLogxK
U2 - 10.1111/j.0959-9673.2004.00381.x
DO - 10.1111/j.0959-9673.2004.00381.x
M3 - Artículo
SN - 0959-9673
VL - 85
SP - 135
EP - 145
JO - International Journal of Experimental Pathology
JF - International Journal of Experimental Pathology
IS - 3
ER -