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Topic Review
Abdominal Aortic Aneurysms
This entry outlines recent preclinical and clinical advances in molecular imaging of abdominal aortic aneurysms (AAA) with a focus on molecular magnetic resonance imaging (MRI) of the extracellular matrix (ECM). In addition, developments in pharmacologic treatment of AAA targeting the ECM are reviewed and results from animal studies are contrasted with clinical trials. Abdominal aortic aneurysm (AAA) is an often fatal disease without non-invasive pharmacologic treatment options. The ECM, with collagen type I and elastin as major components, is the key structural component of the aortic wall and is recognized as a target tissue for both initiation and the progression of AAA. Molecular imaging allows in vivo measurement and characterization of biological processes at the cellular and molecular level and sets forth to visualize molecular abnormalities at an early stage of disease, facilitating novel diagnostic and therapeutic pathways. By providing surrogate criteria for the in vivo evaluation of the effects of pharmacological therapies, molecular imaging techniques targeting the ECM may facilitate the development of pharmacological drugs. In addition, molecular targets can also be used within theranostic approaches that have the potential for timely diagnosis and simultaneous medical therapy. Recent successes in preclinical studies suggest future opportunities for clinical translation. However, further clinical studies are needed to validate the most promising molecular targets for human application.
  • 518
  • 22 Sep 2021
Topic Review
Abdominal Compartment Syndrome
Compartment syndrome occurs when increased pressure inside a closed anatomical space compromises tissue perfusion. The sudden increase in pressure inside these spaces requires rapid decompression by means of surgical intervention. In the case of abdominal compartment syndrome (ACS), surgical decompression consists of a laparostomy. 
  • 495
  • 10 Jan 2022
Topic Review
Aberrant Circadian Rhythm in Huntington’s Disease
Huntington’s disease (HD) is a progressive neurodegenerative disorder characterized by abnormal progressive involuntary movements, cognitive deficits, sleep disturbances, and psychiatric symptoms. Notably, gamma-aminobutyric acid (GABA)-ergic neurons that express the vasoactive intestinal peptide (VIP) in the brain play a key role in the regulation of circadian rhythm and neuroplasticity. While an abnormal clock gene pathway has been associated with the inactivation of GABAergic VIP neurons, recent studies suggest the activation of this neuronal population in the brain positively contributes to neuroplasticity.
  • 515
  • 22 Dec 2022
Topic Review
Aberrant Expression of Immunohistochemical Markers
Malignant melanoma can rarely present with unusual staining patterns. This includes aberrant expression of non-melanocytic markers and/ or lack of expression of specific melanocytic markers. 
  • 682
  • 24 Nov 2021
Topic Review
Aberrant Translation in Cancer
Aberrant translation, a characteristic feature of cancer, is regulated by the complex and sophisticated RNA binding proteins (RBPs) in the canonical translation machinery. N6-methyladenosine (m6A) modifications are the most abundant internal modifications in mRNAs mediated by methyltransferase-like 3 (METTL3). METTL3 is commonly aberrantly expressed in different tumors and affects the mRNA translation of many oncogenes or dysregulated tumor suppressor genes in a variety of ways.
  • 265
  • 08 Jun 2023
Topic Review
Aberrant Vascular System in Neurovascular-Related Diseases
Bidirectional communication between neurons and non-neuronal cells, including glia, plays a role in the pathogenesis of neural diseases. Recent findings have suggested that aberrant vascularization and vascular systems may also be involved in the development of neurodevelopmental diseases and neurodegenerative disorders.
  • 470
  • 19 Jan 2023
Topic Review
Aberrations in Eutopic Endometrium
The “endometrial determinism” theory was proposed to account for the apparent gap between the relatively low prevalence of endometriosis and nearly universal retrograde menstruation. The theory was advanced to justify “root treatment”, intended to nip endometriosis in the bud. The theory has significant weaknesses. Critically, identified aberrations in the ectopic endometrium in endometriosis may be the consequence rather than the cause of endometriosis.
  • 353
  • 20 Feb 2023
Topic Review
ABHD11 Antisense RNA 1
ABHD11-AS1 is an RNA gene known as long intergenic non-protein coding RNA 35 (LINC00035) and Williams–Beuren syndrome chromosome region 26 (WBSCR26), located at 7q11.23.
  • 468
  • 14 Mar 2022
Topic Review
Abiraterone
Abiraterone, also known as abiraterone acetate and sold under the brand name Zytiga among others, is a medication used to treat prostate cancer. Specifically it is used together with corticosteroid for metastatic castration-resistant prostate cancer (mCRPC) and metastatic high-risk castration-sensitive prostate cancer (mCSPC). It should either be used following removal of the testicles or along with a gonadotropin-releasing hormone (GnRH) analog. It is taken by mouth. Common side effects include tiredness, vomiting, headache, joint pain, high blood pressure, swelling, low blood potassium, high blood sugar, hot flashes, diarrhea, and cough. Other severe side effects may include liver failure and adrenocortical insufficiency. In males who partners can become pregnant, birth control is recommended. Supplied as abiraterone acetate it is converted in the body to abiraterone. Abiraterone works by suppressing the production of androgens – specifically it inhibits CYP17A1 – and thereby decreases the production of testosterone. In doing so, it prevents the effects of these hormones in prostate cancer. Abiraterone was described in 1995, and approved for medical use in the United States and Europe in 2011. It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system. In the United Kingdom it costs the NHS £2,735 a month as of 2018. In the United States this amount costs US$3,276 as of 2019. The medication is marketed widely throughout the world.
  • 951
  • 14 Nov 2022
Topic Review
Abnormal Microenvironment Responsive MRI Nanoprobe
Magnetic resonance imaging (MRI) is often used to diagnose diseases due to its high spatial, temporal and soft tissue resolution. Environment-responsive or smart MRI nanoprobes can specifically target cells based on differences in the cellular environment and improve the contrast between diseased tissues and normal tissues.
  • 619
  • 21 May 2021
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