Evidence map›Paper›PMID 25169756›Full record

ArticleEuropean journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences2014

Mechanistic interpretation of conventional Michaelis-Menten parameters in a transporter system.

Diana Vivian, James E Polli

Abstract read
In one paragraph

Article in European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

12 citing papers in PubMed.

  1. Comparative analysis of STP6 and STP10 unravels molecular selectivity in sugar transport proteins.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  2. Article
  3. Effects of PFAS on human liver transporters: implications for health outcomes.Toxicological sciences : an official journal of the Society of Toxicology · 2024
    Review
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors.

Diana VivianUniversity of Maryland School of Pharmacy, Baltimore, MD 21201, USA.
James E PolliUniversity of Maryland School of Pharmacy, Baltimore, MD 21201, USA. Electronic address: jpolli@rx.umaryland.edu.

Funding

Research Training in Gastroenterology and HepatologyT32DK067872 · NIDDK · UNIVERSITY OF MARYLAND BALTIMORE · PI RAUFMAN, JEAN-PIERRE · 2005 to 2024
$7.2M
University of Maryland Center of Excellence in Regulatory Science and InnovationU01FD004320 · FDA · UNIV OF MARYLAND, COLLEGE PARK · PI BENTLEY, WILLIAM E., POLLI, JAMES E · 2011 to 2016
$3.8M
Substrate requirements of the bile acid transporterR01DK067530 · NIDDK · UNIVERSITY OF MARYLAND BALTIMORE · PI POLLI, JAMES E · 2005 to 2009
$1.4M
FDA HHS U01 FD004320FDA HHS U01FD004320NIDDK NIH HHS DK67530NIDDK NIH HHS R01 DK067530NIDDK NIH HHS T32 DK067872
6 · The paper itself

Abstract

The aim was to elucidate how steps in drug translocation by a solute carrier transporter impact Michaelis-Menten parameters Km, Ki, and Vmax. The first objective was to derive a model for carrier-mediated substrate translocation and perform sensitivity analysis with regard to the impact of individual microrate constants on Km, Ki, and Vmax. The second objective was to compare underpinning microrate constants between compounds translocated by the same transporter. Equations for Km, Ki, and Vmax were derived from a six-state model involving unidirectional transporter flipping and reconfiguration. This unidirectional model is applicable to co-transporter type solute carriers, like the apical sodium-dependent bile acid transporter (ASBT) and the proton-coupled peptide cotransporter (PEPT1). Sensitivity analysis identified the microrate constants that impacted Km, Ki, and Vmax. Compound comparison using the six-state model employed regression to identify microrate constant values that can explain observed Km and Vmax values. Results yielded some expected findings, as well as some unanticipated effects of microrate constants on Km, Ki, and Vmax. Km and Ki were found to be equal for inhibitors that are also substrates. Additionally, microrate constant values for certain steps in transporter functioning influenced Km and Vmax to be low or high.

Indexed as

Biological TransportCarrier ProteinsDipeptidesHumansKineticsMembrane GlycoproteinsNonlinear DynamicsProtonsSymportersbile acid binding proteinsCarrier ProteinsDipeptidesMembrane GlycoproteinsProtonsSymportersApical sodium-dependent bile acid transporterMichaelis–MentenModelTransporter

Identifiers

PMID25169756
PMCPMC4204736

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.