Id |
Subject |
Object |
Predicate |
Lexical cue |
T227 |
0-95 |
Sentence |
denotes |
Lipid analyses were conducted on exosomes isolated from the plasma of the same cohort (n = 75). |
T228 |
96-264 |
Sentence |
denotes |
The purity of isolated exosomes was validated by the enrichment in exosome-specific protein marker ALG-2-interacting protein X (Alix) (Théry et al., 2001) (Figure S5A). |
T229 |
265-481 |
Sentence |
denotes |
In line with previous reports on exosome lipid compositions (Subra et al., 2007), the isolated exosomes displayed selective enrichment of raft-associated lipids, including free cholesterol (Cho) and SMs (Figure S5B). |
T230 |
482-687 |
Sentence |
denotes |
Interestingly, we also noted exosome-specific enrichments in 20:4-BMPs, PUFA-PSs, and several GM3s relative to plasma (Figure S5B), suggesting that these lipids might partake in exosome-specific processes. |
T231 |
688-893 |
Sentence |
denotes |
In corroboration with postulations drawn based on plasma lipid profile changes, we found that GM3s were increasingly enriched in the exosomes of COVID-19 patients of elevating disease severity (Figure 5 ). |
T232 |
894-1036 |
Sentence |
denotes |
Several GM3s exhibited greater than 2-fold increases in the exosomes (p < 0.05) of COVID-19 patients relative to healthy controls (Figure 5A). |
T233 |
1037-1308 |
Sentence |
denotes |
Progressive increases with increasing disease severity were similarly noted for GM3s of varying acyl chain lengths, e.g., very long-chain GM3 d18:0/26:0 (p = 0.0008) and GM3 d18:1/24:1 (p = 0.0015), as well as medium-chain such as GM3 d18:1/16:0 (p = 0.0017) (Figure 5B). |
T234 |
1309-1410 |
Sentence |
denotes |
BMP38:5(18:1/20:4) was reduced in the exosomes of COVID-19 patients compared to controls (Figure 5A). |
T235 |
1411-1548 |
Sentence |
denotes |
Increasing endosomal BMP content was previously found to impede intercellular transmission of HIV particles (Chapuy-Regaud et al., 2013). |
T236 |
1549-1679 |
Sentence |
denotes |
PUFA-PSs such as PS 40:7 and PS 40:5 were specifically increased in the exosomes of severe compared to moderate cases (Figure 5C). |
T237 |
1680-1874 |
Sentence |
denotes |
While plasma changes in sphingolipids, particularly GM3s, were recapitulated in exosomes, many of the changes in phospholipids (with the exception of PSs) were not observed in isolated exosomes. |
T238 |
1875-2055 |
Sentence |
denotes |
These observations suggested that plasma changes in glycerophospholipids associated with COVID-19 might be attributed to other components, such as lipoproteins, in the circulation. |
T239 |
2056-2111 |
Sentence |
denotes |
Figure 5 Lipid Changes in Exosomes of COVID-19 Patients |
T240 |
2112-2223 |
Sentence |
denotes |
(A) Lipid changes in isolated exosomes from plasma of healthy controls (n = 25) and COVID-19 patients (n = 50). |
T241 |
2224-2376 |
Sentence |
denotes |
Colored dots (blue and red) in volcano plot indicate lipids that were significantly different (p < 0.05) between healthy controls and COVID-19 patients. |
T242 |
2377-2634 |
Sentence |
denotes |
Blue dots indicate significant lipids with fold change ≥ 2 in COVID-19 patients relative to controls listed in the blue panel, while red dots indicate significant lipids with fold change < 2 in patients relative to controls (listed in red and green panels). |
T243 |
2635-2865 |
Sentence |
denotes |
Lipids on the right side of vertical line at x = 0 were increased in COVID-19 patients compared to controls (blue and red panels), and lipids on the left side were decreased in COVID-19 patients compared to controls (green panel). |
T244 |
2866-3158 |
Sentence |
denotes |
(B) Boxplots illustrate sum of all GM3s (p = 0.0037), and three representatives, GM3 d18:0/26:0 (p = 0.0008), GM3 d18:1/16:0 (p = 0.0017), and GM3 d18:1/24:1 (p = 0.0015), that displayed increasing trends in isolated exosomes from healthy controls to COVID-19 patients of increasing severity. |
T245 |
3159-3255 |
Sentence |
denotes |
Exosome lipids were expressed in nanomoles of lipids per gram of total protein (nmol/g protein). |
T246 |
3256-3399 |
Sentence |
denotes |
(C) Volcano plots illustrate exosome lipids that were significantly different (p < 0.05) in pairwise comparisons indicated on top of each plot. |
T247 |
3400-3643 |
Sentence |
denotes |
Dots corresponding to significant lipids (p < 0.05) were colored (blue and red), and lipids with fold change ≥ 2 were colored blue and listed in the blue panel accompanying each volcano plot, while lipids with fold change < 2 were colored red. |
T248 |
3644-3663 |
Sentence |
denotes |
See also Figure S5. |