Figure 1.
Western blot of wild type (W) littermates, NPC1 (Mut) or NPC2 (Mut) mutant mouse lungs using anti-NPC1 or -NPC2 antibody. β-actin used as a loading control. 30 µg protein/lane.
Figure 2.
Light micrograph of mutant mice lungs stained with hematoxylin and eosin.
Lungs from BALB/c wild type (95 days), NPC1 mutant (70 days) and NPC2 mutant mice (88 days). NPC1 and NPC2 mutant mice show “nests” of macrophages and alveolar macrophages with large inclusions.
Figure 3.
Morphology of wild type and mutant mice lungs by electron microscopy.
Wild type lung (A–C). A. Overview of section of lung with alveolar type II cell (AT2) and endothelial cell (Endo). B. Capillary (Ca). C. Respiratory membrane with type I cell (T1) and endothelial cell (Endo). AS, alveolar space. NPC1 mutant lung (D–H). D. Overview of lung with leukocytes in the capillary and excess surfactant in alveolar space. AL, alveolar lipidosis. d. Enlargement of area in D showing vacuolar leukocyte (L). Similar leukocytes were seen in NPC2 mutant lung. E. Alveolar type II cell (AT2) with a foamy alveolar macrophage (AM) in close proximity in the alveolar space. e. Enlargement of area in E showing type II cell-macrophage contact. *Indicates vacuolar inclusions in endothelial cell. F. Alveolar macrophage with lipid-like material and vacuolar inclusions. G. Type II cells with excess surfactant (white arrowhead). H. Endothelial cell with vesicular inclusions (*). NPC2 mutant lung (I–P). I. Overview of lung with surfactant completely filling the alveolar space characteristic of alveolar lipidosis. J. AT2 with an alveolar macrophage containing multivesicular whirls and a foamy circulating macrophage (CM). K. Respiratory membrane of endothelial cell, basement membrane (BM) and type I cell and demonstrating large amounts of surfactant as tubular myelin (TM) and aggregate (Ag) structures. L. Endothelial cell with vesicular structures. M. Alveolar space with black arrowhead indicating proteinaceous material. Similar material was seen in NPC1 mutant lung. N. Large aggregate structure with tightly packed phospholipid-type whirls (gray arrowheads) or string-like structures (white arrowhead) in alveolar space. O. Surfactant vesicles (white arrowheads) filling the alveolar space. P. Type II cell with inset (p) showing autophagosome-like structures (ap) in enlargement.
Figure 4.
Size of mouse lamellar bodies.
Using electron microscopic photographs of type II cells from wild type, NPC1 and NPC2 mutant mice, the size of the lamellar bodies was analyzed using ImageJ. Top. Electron micrographs of typical type II cells from wild type (WT, left), NPC1 (middle) and NPC2 (right) mutant mice. LB, lamellar body. Bottom. Histogram of the lamellar bodies from wild type (white triangles), NPC1 (gray circles) and NPC2 (black circles) type II cells. Frequency of each lamellar body size in micron2 is expressed as a % of the total numbers of lamellar bodies. Inset: size of lamellar bodies in grouped bins. Wild type, 60 type II cells, 451 LBs, 3 mice; NPC1, 53 type II cells, 435 LBs, 3 mice; NPC2, 37 type II cells, 459 LBs, 3 mice. *Statistically significant difference, P<0.05. E. Lamellar body sizes in grouped bins of ranges of areas.
Figure 5.
Lipid content and degradation of DPPC in mice lungs.
A–C Cholesterol and phospholipid content of mice lungs. A. Lipid content of the lavaged lung as µg lipid/mg lung protein. Data are mean±SE, n = 4 separate mice. B. Broncho-alveolar lavage (BAL) of mice lungs. Data as µg lipid/gm weight of lung and are mean±SE, n = 4 separate mice. C. Lipid content of lamellar bodies isolated from the lungs of the wild type and mutant mice. Four (NPC1 or wild type littermates) or three (NPC2 or wild type littermates) lamellar body preparation isolated from the lungs of 2–6 mice. *Statistically significant difference versus wild type littermates, #statistically significant difference between wild types. δ Statistically significant difference between mutants, P<0.05. D. Degradation of 3H-labeled DPPC as percentage of total label uptake. 3H-DPPC liposome degradation by the isolated, perfused lungs of three wild type or NPC1 mutant mice after intratracheal instillation. Values are means±SE. *Statistically significant difference from wild type. P<0.001, n = 3. Total degradation is the sum of lysophosphatidyl choline (lysoPC), unsaturated PC (unsatPC), and the aqueous fractions.
Table 1.
Physical parameters of NPC mice and wild type littermates.
Figure 6.
Surfactant protein-A (SP-A) content of (A) lungs and (B) surfactant isolated from wild type (W) or NPC mutant (NPC1, NPC2) mice.
Left, Western blots of SP-A or actin. Right, quantitation of Western blots. A. Arbitrary units (AU) of SP-A relative to actin from lungs of NPC1 or NPC2 mutant mice (C1 or C2) or age-matched wild type controls (W1 or W2) (n = 6–8) or B. Arbitrary units of SP-A in surfactant (n = 4–9). All samples were loaded at equal protein values. *Significant difference from wild type, (P<0.05). The two SP-A bands are due to differences in glycosylation.
Figure 7.
Immunocytochemistry of (A.) type II cells or (B.) alveolar macrophages isolated from wild type and NPC mutant mice.
A. Type II cells were isolated from NPC1 (Top) or NPC2 (Bottom) mutant mice or their corresponding wild type littermates and placed in culture for 24 hrs. The cells were fixed and stained with anti-ABCA3 antibody (green) to mark the lamellar body limiting membrane or filipin (Fil, gray or blue) to mark cholesterol. The merged pictures with anti-ABCA3 in green and filipin in blue are enlarged. Scale bar = 5 µm. B. Alveolar macrophages from NPC mutant mice contain cholesterol. Alveolar macrophages were isolated from the lung lavage from NPC1 (Top) or NPC2 (Bottom) mutant mice or their corresponding wild type littermates and placed in culture for 2 hrs. The cells were fixed and stained with filipin which labels free unesterified cholesterol. Lt, Phase micrograph; Fil, Filipin stain in gray. Merge of phase and filipin (blue) are enlarged. Scale bar = 10 µm.
Figure 8.
Lipid content of NPC mutant macrophages is elevated.
Alveolar macrophages were isolated and cultured as in Fig. 7. The cells were harvested and the phospholipid and cholesterol content analyzed. W1,W2. Wild type littermates from NPC1 or NPC2 mutant mice, respectively. C1, NPC1; C2, NPC2. The data are mean±SE, n = 4 separate mice. *Statistically significant difference from corresponding wild type littermates. #Significant difference between NPC1 and NPC2 mutant macrophages, P<0.05.
Figure 9.
A. Histology of feline lung. Wild type (WT) and NPC1 mutant (NPC1) feline lungs (25 weeks old) stained with hematoxylin and eosin. NPC1 mutant feline show thickened septae, enlarged “foamy” macrophages in capillaries and alveolar macrophages in the alveolar space. B. Electron micrographs (EM) of typical type II cells from wild type (WT) and NPC1 mutant (NPC1) feline indicating that the size of NPC1 mutant feline lamellar bodies is enlarged. C. Histogram of the lamellar bodies from wild type (white triangles) and NPC1 (gray circles) type II cells. Using electron microscopic photographs of type II cells from wild type and NPC1 mutant felines, the size of the lamellar bodies was analyzed using ImageJ. C, Inset: size of lamellar bodies in grouped bins in ranges of areas. Frequency of each lamellar body size in micron2 is expressed as a % of the total numbers of lamellar bodies. Wild type (WT): 28 type II cells, 250 LBs, 3 feline; NPC1 mutant: 35 type II cells, 323 LBs, 3 feline.
Figure 10.
Phospholipid and cholesterol content of feline lungs.
A. Lipid content of the lung. Data are mean±SE, n = 3 feline. B. Lipid content of lamellar bodies isolated from the lungs of the wild type and NPC1 mutant feline. Data are the mean±SE and range of 5 (WT) or 4 (NPC1 mut) lamellar body preparations isolated from feline lungs analyzed in triplicate. *Significant different from WT.