One siRNA pool targeting the λ constant region stops λ light-chain production and causes terminal endoplasmic reticulum stress.
In systemic light-chain amyloidosis, λ light chains produced by clonal plasma cells cause organ damage and early death. In pursuit of novel therapy, we developed 1 pool of short interfering RNA (siRNA) targeting the constant region of λ light chains that substantially and promptly reduces λ-light-chain production and secretion by human plasma cells regardless of sequence diversity. In clones producing intact immunoglobulin G (IgG) λ antibodies (containing paired heavy and light chains), the secretion of intact antibodies is reduced, and all 3 branches of the unfolded protein response are activated by accumulation of unpaired IgG heavy chains in the endoplasmic reticulum (ER). Moreover, an ER stress response can then become terminal with effector caspase activity mediated in part by the transcription of the Bcl-2 homology 3 domain only family member NOXA. This pool of siRNA can be used to reduce pathological λ-light-chain production and cause apoptosis in human plasma cells making intact IgGλ antibodies.
Tufts Medical Center, Boston, MA; and.
Ping
P
Zhou
Tufts Medical Center, Boston, MA; and.
Xun
X
Ma
Tufts University School of Medicine, Boston, MA.
Lakshmanan
L
Iyer
Tufts Medical Center, Boston, MA; and.
Chakra
C
Chaulagain
Tufts Medical Center, Boston, MA; and Tufts University School of Medicine, Boston, MA.
Raymond L
RL
Comenzo
D000686:Amyloidosis / Q000235:genetics / Q000378:metabolism; D020169:Caspases / Q000378:metabolism; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000235:genetics; D059865:Endoplasmic Reticulum Stress / Q000235:genetics*; D004789:Enzyme Activation; D005786:Gene Expression Regulation; D055785:Gene Knockdown Techniques; D006801:Humans; D007127:Immunoglobulin Constant Regions / Q000235:genetics*; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007146:Immunoglobulin lambda-Chains / Q000235:genetics* / Q000378:metabolism; D007136:Immunoglobulins / Q000096:biosynthesis; D054219:Neoplasms, Plasma Cell; D010950:Plasma Cells / Q000276:immunology / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics* / Q000378:metabolism; D056811:Unfolded Protein Response / Q000235:genetics
D007127:Immunoglobulin Constant Regions; D007143:Immunoglobulin Heavy Chains; D007146:Immunoglobulin lambda-Chains; D007136:Immunoglobulins; C498702:PMAIP1 protein, human; D019253:Proto-Oncogene Proteins c-bcl-2; D034741:RNA, Small Interfering; D020169:Caspases