Quantitative LC-MS/MS Analysis of Endogenous Isomeric Metabolites Biliverdin IX Alpha, Beta, and Delta in Cell Culture Supernatant, Cell Pellet, and Lung Tissue.

() utilizes heme as an iron source from the host during infection. Biliverdin beta and delta (BVIXβ and BVIXδ) are generated by HemO, specific to , while biliverdin alpha is generated from the bacterial BphO system and by mammalian heme oxygenases. Here, we have developed and characterized a quantitative LC-MS/MS assay for the separation of three endogenous isomers, BVIXα, BVIXβ, and BVIXδ.

Diabetes care in the pandemic era in the Midwestern USA: a semi-structured interview study of the patient perspective.

Objectives: To understand patients' experiences with diabetes care during the COVID-19 pandemic, with an emphasis on rural, medically underserved, and/or minoritised racial and ethnic groups in the Midwestern USA.

Design: Community-engaged, semi-structured interviews were conducted by medical student researchers trained in qualitative interviewing. Transcripts were prepared and coded in the language in which the interview was conducted (English or Spanish).

heme metabolites biliverdin IXβ and IXδ are integral to lifestyle adaptations associated with chronic infection.

Unlabelled: is a versatile opportunistic pathogen requiring iron for its survival and virulence within the host. The ability to switch to heme as an iron source and away from siderophore uptake provides an advantage in chronic infection. We have recently shown the extracellular heme metabolites biliverdin IXβ (BVIXβ) and BVIXδ positively regulate the heme-dependent cell surface signaling cascade.

The heme-responsive PrrH sRNA regulates pyochelin gene expression.

is an opportunistic pathogen that requires iron for growth and virulence, yet this nutrient is sequestered by the innate immune system during infection. When iron is limiting, expresses the PrrF1 and PrrF2 small RNAs (sRNAs), which post-transcriptionally repress expression of nonessential iron-containing proteins, thus sparing this nutrient for more critical processes. The genes for the PrrF1 and PrrF2 sRNAs are arranged in tandem on the chromosome, allowing for the transcription of a longer heme-responsive sRNA, termed PrrH.