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Forty years of seasonal affective disorder.
Psychiatr Pol
October 2024
Uniwersytet Medyczny w Poznaniu.
In 2024, we observe the fortieth anniversary of the publication, where, for the first time, the term of Seasonal Affective Disorder (SAD) was used. Presently, SAD is regarded as a special category of mood disorder. In the American Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-V), the seasonality makes a specifier, "with seasonal pattern", both for recurrent depression or Major Depressive Disorder (MDD), and for Bipolar Disorder (BD).
View Article and Find Full Text PDFCluster Headache and Hypoxia: Breathing New Life into an Old Theory, with Novel Implications.
Neurol Int
December 2024
Department of Psychology, University of Maine, 301 Williams Hall, Orono, ME 04469-5742, USA.
Cluster headache is a severe, poorly understood disorder for which there are as yet virtually no rationally derived treatments. Here, Lee Kudrow's 1983 theory, that cluster headache is an overly zealous response to hypoxia, is updated according to current understandings of hypoxia detection, signaling, and sensitization. It is shown that the distinctive clinical characteristics of cluster headache (circadian timing of attacks and circannual patterning of bouts, autonomic symptoms, and agitation), risk factors (cigarette smoking; male gender), triggers (alcohol; nitroglycerin), genetic findings (GWAS studies), anatomical substrate (paraventricular nucleus of the hypothalamus, solitary tract nucleus/NTS, and trigeminal nucleus caudalis), neurochemical features (elevated levels of galectin-3, nitric oxide, tyramine, and tryptamine), and responsiveness to treatments (verapamil, lithium, melatonin, prednisone, oxygen, and histamine desensitization) can all be understood in terms of hypoxic signaling.
View Article and Find Full Text PDFDivergence in Regulatory Regions and Gene Duplications May Underlie Chronobiological Adaptation in Desert Tortoises.
Mol Ecol
January 2025
Department of Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Many cellular processes and organismal behaviours are time-dependent, and asynchrony of these phenomena can facilitate speciation through reinforcement mechanisms. The Mojave and Sonoran desert tortoises (Gopherus agassizii and G. morafkai respectively) reside in adjoining deserts with distinct seasonal rainfall patterns and they exhibit asynchronous winter brumation and reproductive behaviours.
View Article and Find Full Text PDFTime and headache: Insights into timing processes in primary headache disorders for diagnosis, underlying pathophysiology and treatment implications.
Cephalalgia
November 2024
Headache Unit, Neurology Department, Vall d'Hebron University Hospital, Barcelona, Spain.
Article Synopsis
- Time plays a critical role in diagnosing headache disorders and understanding their underlying mechanisms, highlighting the need for effective timing analysis in headache research.
- A review of studies covering primary headache types—migraine, tension-type headache, and cluster headache—reveals distinct timing patterns, such as circadian rhythms in migraines and night-time occurrences in cluster headaches.
- Understanding these time patterns can improve the phenotyping, management, and treatment of headache disorders, pointing towards new, personalized approaches in headache care.
From Seasonality to Species Conservation: Chronobiological Research on European Hamsters in Strasbourg, France.
J Pineal Res
October 2024
Institute of Chronoecology, Stuttgart, Germany.
The first monograph on the European hamster from the Strasbourg region dates back to 1765. By the 1930s, a long and continuous chronobiological research tradition was established for this species, starting with the works of Charles Kayser, who published between 1938 and 1971. Another early key researcher in this area was Bernhard Canguilhem with publications from 1966 to 1999.
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