Identification, Expression, and Functional Characterization of Full-Length and Splice Variants of Murine Organic Anion Transporting Polypeptide 1b2
Bibliographic record
Abstract
The family of organic anion transporting polypeptides (OATPs) plays an important role in mediating the cellular uptake of numerous endogenous and exogenous compounds. Members of this family include human OATP1B1 and OATP1B3, which have been widely studied and shown to be involved in the hepatic uptake of hormones, bile acids, and many clinically used drugs. However, little is known about the murine orthologue, Oatp1b2. We determined expression of mouse oatp1b2 mRNA and protein using real-time PCR and Western blot analysis. Interestingly, mRNA transcripts and protein were detectable in a number of tissues including kidney and stomach, and, not surprisingly, the highest expression was noted in liver. Cloning of the full coding region of oatp1b2 revealed the presence of two novel splice variants. Interestingly, these splice variants were significantly expressed in organs such as the kidney, but much less in liver. Heterologous expression of the full-length Oatp1b2 cDNA revealed that taurocholic acid, estrone 3-sulfate, estradiol 17beta-glucuronide and pravastatin are substrates of this transporter. The newly identified splice variants were unable to significantly transport substrate compounds due to defects in cell surface trafficking. Our findings of murine Oatp1b2 expression and function will likely aid in better defining species related differences in OATP transporter function and the use of mouse models to predict hepatic drug disposition in humans.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".