The term diazepam-binding inhibitor refers to an endogenous protein in this paper. Elevated ACBP/DBI is not a laboratory finding of diazepam exposure.
Li and colleagues examined acyl coenzyme A binding protein, also called ACBP/DBI. The DBI gene name refers to diazepam-binding inhibitor. The protein has intracellular metabolic functions and extracellular signaling roles, including interaction with GABA-A receptors.
The paper discusses earlier observations of increased circulating ACBP/DBI during fasting and obesity. These apparently contrasting states prompted a theoretical account involving transcriptional and post-transcriptional regulation. The article is labeled a viewpoint and includes bioinformatic analysis rather than a clinical trial of diazepam.
The authors report that one isoform, ACBP1, predominated in the human transcript data they examined: about 90% of DBI transcripts in most tissues, with a lower proportion in testis. They propose a framework for understanding how circulating protein could increase under different metabolic circumstances.
The discussion also draws on animal work and previously reported human findings. Those evidence streams should remain distinct. A theoretical explanation supported by database patterns does not establish a clinical diagnostic cutoff or prove the proposed mechanism in an individual patient.
A reference to diazepam binding in a protein study can be mistaken for research on administered benzodiazepines. Here, the analyte of interest is an endogenous protein. The article does not show that diazepam ingestion produced the reported protein concentrations.
Reports should identify the exact analyte and assay before using receptor terminology to infer exposure. This paper is useful for preventing a category error between endogenous signaling and exogenous drug measurement. It does not demonstrate sedation, driving impairment, or benzodiazepine poisoning.
Based on the supplied paper: Elevated plasma levels of the appetite stimulator ACBP DBI in fasting and obese subjects. PMC8283301.