Promoting cultural competency and osteopathic medicine awareness among premedical students through a summer premedical rural enrichment program.

Context: Premedical preparatory programs at osteopathic medical schools that recruit students from medically underserved areas (MUAs) may promote interest in practicing osteopathic medicine in underserved or rural areas. In these programs, emphasis on cultural competency may increase diversity among medical school applicants and decrease healthcare disparities in the future.

Objectives: The goal of this study is to determine whether a summer premedical rural enrichment program (PREP) held at an osteopathic medical school located in a MUA will foster greater prioritization of cultural competency in medicine, enhance interest in practicing in rural or underserved areas, and increase familiarity with osteopathic medicine.

Electropositive charge in alpha-defensin bactericidal activity: functional effects of Lys-for-Arg substitutions vary with the peptide primary structure.

Cationic amino acids contribute to alpha-defensin bactericidal activity. Curiously, although Arg and Lys have equivalent electropositive charges at neutral pH, alpha-defensins contain an average of nine Arg residues per Lys residue. To investigate the role of high alpha-defensin Arg content, all Arg residues in mouse Paneth cell alpha-defensin cryptdin 4 (Crp4) and rhesus myeloid alpha-defensin 4 (RMAD-4) were replaced with Lys to prepare (R/K)-Crp4 and (R/K)-RMAD-4, respectively.

Humoral immunity and the evolution of HIV-2.

Human immunodeficiency virus type 2 (HIV-2) evolved from the zoonotic transmission of simian immunodeficiency virus (SIV) that naturally infects sooty mangabeys found in West Africa. Using sera from HIV-2-infected humans, we discovered that an hypervariable region (the V4 loop) of HIV-2 induces antibody responses only weakly reactive against itself but strongly reactive against analogous sequences from the V4 loop of strains of SIV. Available sequence data indicates that all strains of HIV-2 have large deletions in the V4 region that truncate an immunodominant neutralizing B cell epitope among strains of SIV.