D18G TTR and amyloidogenic M-TTRs are co-secreted with ΔKDEL BiP
(BiPs). A, BiP constructs used in this study. B,
BiP-myc, BiPs-myc, or control vector was transiently co-transfected with TTRs
or M-TTRs in HeLa cells. After 24 h, medium was changed, and cells were
maintained for another 24 h. Media were immunoprecipitated (IP) with
anti-c-Myc antibody and analyzed by Western blotting (IB) with
anti-TTR and anti-c-Myc antibodies. WT, wild type.