| First Author | O'Connor T | Year | 2012 |
| Journal | PLoS Pathog | Volume | 8 |
| Issue | 8 | Pages | e1002867 |
| PubMed ID | 22912582 | Mgi Jnum | J:195369 |
| Mgi Id | MGI:5478677 | Doi | 10.1371/journal.ppat.1002867 |
| Citation | O'Connor T, et al. (2012) Lymphotoxin, but not TNF, is required for prion invasion of lymph nodes. PLoS Pathog 8(8):e1002867 |
| abstractText | Neuroinvasion and subsequent destruction of the central nervous system by prions are typically preceded by a colonization phase in lymphoid organs. An important compartment harboring prions in lymphoid tissue is the follicular dendritic cell (FDC), which requires both tumor necrosis factor receptor 1 (TNFR1) and lymphotoxin beta receptor (LTbetaR) signaling for maintenance. However, prions are still detected in TNFR1(-)/(-) lymph nodes despite the absence of mature FDCs. Here we show that TNFR1-independent prion accumulation in lymph nodes depends on LTbetaR signaling. Loss of LTbetaR signaling, but not of TNFR1, was concurrent with the dedifferentiation of high endothelial venules (HEVs) required for lymphocyte entry into lymph nodes. Using luminescent conjugated polymers for histochemical PrP(Sc) detection, we identified PrP(Sc) deposits associated with HEVs in TNFR1(-)/(-) lymph nodes. Hence, prions may enter lymph nodes by HEVs and accumulate or replicate in the absence of mature FDCs. |
