Abstract：
:MS risk is associated with low vitamin D status prior to disease, and Epstein Barr virus (EBV) infection seems to be a prerequisite for MS. EBV could activate autoreactive T cells by several mechanisms, but it is not clear why this leads to MS. Only a small proportion of those infected with EBV develops MS, whereas autoreactive T cells are present in the normal T cell repertoire. Genetic factors cannot explain this enigma alone, because the genetic predisposition to MS in most cases is quite weak. Vitamin D receptors are expressed on EBV infected B cells, antigen presenting cells and activated lymphocytes, and the bioactive vitamin D metabolite dihydroxyvitamin D(3) suppresses antibody production and T cell proliferation and skews T cells towards a less detrimental Th2 phenotype. EBV infected B cells constitute a constant challenge to the immune system, also during seasonal periods of relative low vitamin D status. I propose that vitamin D modulates the immune response to EBV, and that detrimental activation of autoreactive T cells leading to MS is more likely if the vitamin D status is suboptimal.
journal_name
Med Hypothesesjournal_title
Medical hypothesesauthors
Holmøy Tdoi
10.1016/j.mehy.2007.04.030subject
Has Abstractpub_date
2008-01-01 00:00:00pages
66-9issue
1eissn
0306-9877issn
1532-2777pii
S0306-9877(07)00316-7journal_volume
70pub_type
杂志文章abstract：:Many experimental evidences indicate that infection with Trypanosoma cruzi delays or inhibits the growth of malignant tumors in different strains of mice and in rats. These facts were verified by different workers. Although earlier workers proposed that this effect would be due to a toxin of T. cruzi, most of the accu...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.1998.0808
更新日期：2000-01-01 00:00:00
abstract：:By influencing fetal brain development pregnancy may be prolonged beyond term for an unknown time period. In late gestation the mother animal (host) is nephrectomized. The urine of the fetus (transplant) is guided to the outside so that the fetal kidneys excrete the host's urinary secretory substances and eventually h...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(82)90078-0
更新日期：1982-10-01 00:00:00
abstract：:This article proposes the hypothesis that allantois is the anatomical homologue of bursa of Fabricius in mammalia. This hypothesis is based on immunohistochemical study of sections from hematopoietic organs of three fetuses with cloacal exstrophy. In the complex maldevelopment of cloacal exstrophy the common features ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(90)90037-f
更新日期：1990-06-01 00:00:00
abstract：:The etiology of sudden-death ischemic heart disease (SDIHD) remains an enigma. Data will be presented which suggest that SDIHD may be due to hypomagnesemia in and around the coronary arterial and arteriolar vessels. We have found that blood vessels (especially arteries and arterioles) deficient with respect to Mg can ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(79)90074-4
更新日期：1979-08-01 00:00:00
abstract：:The concept of reentry as the most important element in a hypothesis for consciousness proposed by Edelman and Tononi is reviewed. Reentry, is a process of ongoing parallel and recursive signalling between separate neuronal groups along parallel reciprocally fibers that link these groups anatomically. Reentry alters t...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.03.007
更新日期：2004-01-01 00:00:00
abstract：:Migraine is frequently assumed to have an hereditary origin, but what this hereditary factor is, no one really knows. Researchers are currently trying to find defects in genes which could either cause, or tend towards, the development of migraine. This approach is deemed mistaken for two reasons: firstly, pain, being ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(02)00176-7
更新日期：2002-09-01 00:00:00
abstract：:The levator ani muscles in women are overloaded by constant supporting abdominal contents, and counteracting rises of abdominal pressure at the level of the urethra. The excessive load leads to a decrease in their type II fibers. This results in stress urinary incontinence due to loss of the fibers responsible for add...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(93)90225-f
更新日期：1993-06-01 00:00:00
abstract：:An unconventional interaction between a patient and parasites was recently reported, in which parasitic cells invaded host's tissues, establishing several tumors. This finding raises various intriguing hypotheses on unpredicted forms of interplay between a patient and infecting parasites. Here we present four unusual ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2016.06.012
更新日期：2016-09-01 00:00:00
abstract：:The dominant role of the physical and chemical environment in the development of cancer is challenged. Analyses of the etiology of skin, bladder, respiratory and gastric cancers are presented which demonstrate the considerable extent to which one's health status may modify the initiation and promotion of environmental...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(79)90058-6
更新日期：1979-01-01 00:00:00
abstract：:Interferon-alpha (IFN) is widely used in the treatment of certain cancers and viral infections, including hepatitis C (HCV). Unfortunately, depression is a common side effect of IFN therapy, affecting approximately a third of HCV patients receiving IFN therapy. Studies have shown that selective serotonin reuptake inhi...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.01.026
更新日期：2005-01-01 00:00:00
abstract：:The incidence of breast cancer in women has increased dramatically over the last decade. Epidemiological markers of this increased incidence include: endocrine related phenomena (early menarche, age of first parity and age of menopause); exposure of the breast to X-radiation; and a group of seemingly disparate factors...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(92)90090-y
更新日期：1992-07-01 00:00:00
abstract：:Despite aggressive intervention, patients who survive an out-of-hospital cardiac arrest (OHCA) generally have very poor prognoses, with nationwide survival rates of approximately 10-20%. Approximately 90% of survivors will have moderate to severe neurological injury ranging from moderate cognitive impairment to brain ...
journal_title：Medical hypotheses
pub_type： 杂志文章,评审
doi：10.1016/j.mehy.2017.06.016
更新日期：2017-08-01 00:00:00
abstract：:Intra-peritoneal adhesions ensuing from surgery or infection may lead to chronic pelvic pain, bowel obstruction, infertility and additional invasive surgery to resolve adhesion-related complications. As a result adhesions are a major clinical, social and economic concern. The cumulative year-on-year direct costs of ad...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2010.11.020
更新日期：2011-03-01 00:00:00
abstract：:Exacerbation of certain medical conditions during specific phases of the menstrual cycle has long been recognized. Mechanisms of the cyclic variations are poorly understood, but are often attributed to fluctuations in reproductive hormones. We hypothesize that normal variations in autonomic balance during the menstrua...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.02.036
更新日期：2004-01-01 00:00:00
abstract：:Alzheimer's disease (AD) includes etiologically heterogeneous disorders characterized by senile or presenile dementia, extracellular amyloid protein aggregations containing an insoluble amyloid precursor protein derivative, and intracytoplasmic tau protein aggregations. Recent studies also show excess neuronal aneuplo...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2003.12.045
更新日期：2004-01-01 00:00:00
abstract：:There are different theories and hypotheses related to the aetiology of depression. The interaction between brain 5-HT level and the activity of its autoreceptors plays a role in mood changes and depression. In major depression, activation of the inflammatory response system (IRS) and, increased concentrations of proi...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(03)00207-x
更新日期：2003-11-01 00:00:00
abstract：:Acute viral infection is characterised by high-level replication before prompt decline of viraemia and, commonly, viral clearance. This kinetic pattern is generally held to be due to immune control. However, infection with some viruses, notably hepatitis C (HCV), hepatitis B (HBV) and the human immunodeficiency virus ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.02.050
更新日期：2004-01-01 00:00:00
abstract：:Atrial fibrillation (Af) is the most common disorder of cardiac rhythm and is responsible for substantial morbidity and mortality in the general population. A recent community-based observational study revealed that diabetes and hypertension were associated with the development of Af. Since there is no definite eviden...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.07.018
更新日期：2006-01-01 00:00:00
abstract：:Dental caries, a bacterial process that results in the acidic destruction of tooth structure, has historically been managed by the mechanical excavation of diseased tooth structure and then restoration with a synthetic material. The mechanical excavation of the infected site is most commonly achieved by a dental handp...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2011.05.002
更新日期：2011-09-01 00:00:00
abstract：:The present analysis addresses the question of how it has been possible for academic medicine to grow and lose its creative productivity at the same time. A mathematical model is developed to simulate the mechanisms that govern growth of medical systems over time. Time-dependent growth of system size increases the occ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.02.028
更新日期：2005-01-01 00:00:00
abstract：:Increased level of oxalates in urine and plasma can be attributed to endogenous overproduction, increased ingestion or excessive intestinal absorption. When a supersaturation status is reached, oxalates combine with calcium and crystallize to form 80% of the urinary stones. Several cardiovascular diseases such as coro...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2020.109570
更新日期：2020-04-01 00:00:00
abstract：:It is sometimes asserted that UK science is thriving, at other times that it has declined. We suggest that both assertions are partly true because the UK is thriving with respect to the volume of 'normal' science production but at the same time declining in the highest level of 'revolutionary' science. Revolutionary s...
journal_title：Medical hypotheses
pub_type： 社论
doi：10.1016/j.mehy.2007.12.004
更新日期：2008-01-01 00:00:00
abstract：:Physical inactivity and a low maximal aerobic capacity (VO2max) strongly predict morbidity and mortality in patients with type 2 diabetes (T2D). Patients with T2D have a reduced VO2max when compared with healthy individuals of similar age, weight, and physical activity levels, and this lower aerobic capacity is usuall...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2017.01.010
更新日期：2017-03-01 00:00:00
abstract：:Cancer's random, reversible, unstable transitions to "normal" structures imply their functional relation. Similar random, continuous, reversible oncogene "mutational transformation" also lacks a consistent hybrid. Positing cancer's "mutationally altered genotype" leads to medically foreign causes, qualities, inducers,...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(87)90155-1
更新日期：1987-06-01 00:00:00
abstract：:Although many risk factors influence atherogenesis, LDL appears to play a primary role in this process. In prospective epidemiology, coronary risk increases as LDL cholesterol increases, throughout the entire range of concentrations encountered in healthy humans. Coronary risk is minimal in individuals and populations...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2003.12.051
更新日期：2005-01-01 00:00:00
abstract：:This hypothesis clearly proposes the true and previously undiscovered cause of male homosexuality or bisexuality and in most cases the predictability in infancy of the development of this sexuality in adulthood. It is based on compelling new evidence which has accumulated over many years. The fetal and neonatal period...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2016.06.006
更新日期：2016-09-01 00:00:00
abstract：:Melatonin is well recognized for its role as a potent antioxidant and is directly implicated in the free radical theory of aging [1] [Reiter RJ, Pablos MI, Agapito TT, Guerrero JM. Melatonin in the context of the free radical theory of aging. Ann N Y Acad Sci 1996;786:362-78]. Moreover, melatonin has been shown to ret...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2006.12.041
更新日期：2007-01-01 00:00:00
abstract：:A possible mechanism for maintaining immune memory, based on idiotypic-anti-idiotypic interactions, is described. It is proposed that pendular dynamic swings in the levels of idiotypic antibodies (Ab1) and anti-idiotypic Ab2 may underlay immune memory. In the terms of the advanced concept, Ab dynamics in the maternal ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.2000.1132
更新日期：2001-02-01 00:00:00
abstract：:We describe a new term: glutamate-based depression (GBD). GBD is defined as a chronic depressive illness associated with environmental stress and diseases associated with altered glutamate neurotransmission. We hypothesize that glutamate-induced over-activation of extrasynaptic NMDA receptors in the subgenual cingulat...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2012.02.009
更新日期：2012-05-01 00:00:00
abstract：:Inadequately responsive glycaemic control is an important factor in the causation of diabetic end-organ damage. Artificial or hybrid bioartificial pancreases can provide responsive glycaemic control that can reduce the enormous personal suffering and socio-economic costs of diabetes. However, they share the shortcomin...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2006.08.047
更新日期：2007-01-01 00:00:00
