TCER-1 acts cell non-autonomously to suppress immunity and promote longevity. a–j TCER-1 expression in any somatic tissue suppresses PA14 resistance. Mean survival (hours) of L4 larvae transferred to PA14. a–e Expression in tcer-1 mutants. Wild type (WT, black, 60.68), tcer-1 (blue, 96.31) and tcer-1 mutants expressing TCER-1 (red) under control of a endogenous promoter (70.91) or promoters expressed in b intestine (gly-19, 55.3), c neurons (rgef-1, 62.32), d muscles (myo-3, 64.0) or e hypodermis (col-12, 71.67). f–j Expression in tcer-1;glp-1 mutants. f Native expression. Wild type (WT, 60.68), glp-1 (79.2), tcer-1;glp-1 (orange, 80.3) and tcer-1;glp-1 mutants expressing TCER-1 under the control of endogenous promoter (44.0). g–j Tissue-specific expression. WT (47.61), glp-1 (59.52), tcer-1;glp-1 (67.98) and tcer-1;glp-1 mutants expressing TCER-1 (red) under the control of promoters expressed in g intestine (22.45), i muscles (25.03) or j hypodermis (47.15). h Neurons: WT (75.3), glp-1 (102.34), tcer-1;glp-1 (126.59) and neuron-expressed TCER-1 (84.31). k–o TCER-1 expression in any somatic tissue extends tcer-1;glp-1 mutant’s lifespan on OP50. Mean survival (days) on OP50. k, l WT (18.7), glp-1 (29.32), tcer-1;glp-1 (17.11) and tcer-1;glp-1 mutants expressing TCER-1 under k endogenous promoter (24.14) and l tissue-specific expression in intestine (25.66). m–o WT (18.44), glp-1 (27.35), tcer-1;glp-1 (21.46) and tcer-1;glp-1 mutants expressing TCER-1 in m neurons (29.98), n muscles (29.26) and o hypodermis (28.14). Survival data analyzed using Kaplan−Meier test. P values adjusted for multiplicity where applicable. Asterisks indicate statistical significance <0.05 (*), <0.001 (***) and <0.0001 (****) and their color denotes the strain of comparison. Assays in some panels were conducted in the same biological replicate so their controls are shared. Details of number of animals and data from additional trials in Supplementary Tables 4A (panels a–e), 4B (f–j) and Supplementary Data 1 (k–o)