Abstract 70: Mitochondrial localization of adiponectin receptor 1 (AdipoR1) induces apoptosis in cancer cells
Bibliographic record
Abstract
Abstract INTRODUCTION Previous studies by us and others demonstrated tumor suppressive effects of adiponectin, an adipocyte derived hormone. Adiponectin signaling occurs through two distinct membrane receptors; AdipoR1 and AdipoR2. There is paucity of data how their activation leads to tumor suppression. Here we present data indicating localization of AdipoR1 to the mitochondria and its role in apoptosis of cancer cells. MATERIALS AND METHODS Human kidney (RCC1932) and cervical (HeLa CCL-2) cancer cells as well as human embryonic kidney cells (HEK 293) were used as models. Full length AdipoR1 and its N-terminal (ligand binding) and C-terminal (intracellular moiety) truncated mutants (mutAdipoR1) ORFs were subcloned into YFP expressing vectors (pEYFP- AdipoR1, pEYFPmutAdipoR1). Cells were seeded onto glass cover slips in multi-well culture plates and transfected with vectors through Lipofectamine-2000 (Invitrogen) method 24 h after seeding. The effect of adiponectin (BioVendor) supplementation was also tested. Immunocytochemistry staining were with MitoTracker labeling or anti-MnSOD (mitochondria), anti-Stearoyl-CoA desaturase (SCD-1, ER), anti-Reb5, anti-manose-6-phosphatase receptor (M6P, endosome); or anti-Catalase (peroxisome). Images of the cells were collected with DM IRB Deconvolution Microscope (Leica) or Confocal microscope LSM510 (Carl Zeiss). Apoptosis was determined by sub-diploid population detection and or annexin binding using flow cytometry. RESULTS Over-expression of AdipoR1 in the cells induced apoptosis which was further augmented by adiponectin treatment. This was evident only in cells expressing full length AdipoR1. Furthermore, cells expressing mutAdipoR1 had different intracellular distributions with loss of mitochondrial localization of the receptor and pro-apoptotic activity. CONCLUSIONS This is the first report showing that AdipoR1 can be localized in the mitochondria. Adiponectin induce apoptosis in cancer cells through mitochondrial localization related mechanism that requires both ligand and signaling domains of AdipoR1. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 70.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".