Acute and Lifelong Endurance Exercise Yields Differential Effects During Circadian Disruption in Mice.

Introduction: Circadian rhythms are responsible for physiological and behavioral processes coordinated in a 24-hour cycle. We investigated whether untimed, long-term voluntary wheel access mitigated circadian disruption and facilitated re-entrainment. Methods: Thirty-four C57Bl/6 J mice (n = 21 males, n = 14 females) were used in this experiment.

Structures of Saccharolobus solfataricus initiation complexes with leaderless mRNAs highlight archaeal features and eukaryotic proximity.

The archaeal ribosome is of the eukaryotic type. TACK and Asgard superphyla, the closest relatives of eukaryotes, have ribosomes containing eukaryotic ribosomal proteins not found in other archaea, eS25, eS26 and eS30. Here, we investigate the case of Saccharolobus solfataricus, a TACK crenarchaeon, using mainly leaderless mRNAs.

Altered Purinergic Signaling and CD8+ T Cell Dysregulation in STAT3 GOF Syndrome.

Signal transduction downstream of activating stimuli controls CD8+ T cell biology, however these external inputs can become uncoupled from transcriptional regulation in Primary Immune Regulatory Disorders (PIRDs). Gain-of-function (GOF) variants in STAT3 amplify cytokine signaling and cause a severe PIRD characterized by early onset autoimmunity, lymphoproliferation, recurrent infections, and immune dysregulation. In both primary human and mouse models of STAT3 GOF, CD8+ T cells have been implicated as pathogenic drivers of autoimmunity.

Circadian Disruption Impacts Fetal Development in Mice Using High-Frequency Ultrasound.

The developmental origins of health and disease theory suggests that environmental exposures during early life, particularly during prenatal life, can greatly influence health status later in life. Irregular light-dark cycles, such as those experienced during shift work, result in the repeated disruption of circadian rhythms, which negatively impacts physiological and behavioral cycles. The purpose of our study was to assess parameters in the developing mouse embryo and fetus using high frequency ultrasound when exposed to circadian disruption.