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Items: 1 to 20 of 47

1.

Pimavanserin

MedGen UID:
361000
Concept ID:
C1722267
Organic Chemical; Pharmacologic Substance
2.

Receptor Down Regulation

A multicellular process that regulates the number of transmembrane receptors, by means of increased internalization or decreased expression of the transmembrane receptor. This process is involved in dampening the response to extracellular signals. [from NCI]

MedGen UID:
215371
Concept ID:
C0949469
Molecular Function
3.

Olanzapine

A synthetic derivative of thienobenzodiazepine with antipsychotic, antinausea, and antiemetic activities. As a selective monoaminergic antagonist, olanzapine binds with high affinity binding to the following receptors: serotoninergic, dopaminergic, muscarinic M1-5, histamine H1, and alpha-1-adrenergic receptors; it binds weakly to gamma-aminobutyric acid type A, benzodiazepine, and beta-adrenergic receptors. The antinausea and antiemetic effects of this agent appear to be due to the blockade of 5-HT2 and 5-HT3 receptors for serotonin. Although its exact mechanism of action in schizophrenia is unknown, it has been proposed that olanzapine's antipsychotic activity is mediated through antagonism to dopamine D2 receptors with rapid ligand-receptor dissociation kinetics that help to minimize extrapyramidal symptoms (EPS). Olanzapine may also stimulate appetite. [from NCI]

MedGen UID:
104292
Concept ID:
C0171023
Organic Chemical; Pharmacologic Substance
4.

Schizophrenia

Schizophrenia is highly heritable, as shown by family, twin, and adoption studies. For example, for identical twins, if one twin develops schizophrenia, the other twin has about a 50% chance of also developing the disease. The risk of the general population developing the schizophrenia is about 0.3-0.7% worldwide. The search for “schizophrenia genes” has been elusive. Initial linkage studies looked at parts of the genome associated with schizophrenia, and many candidate genes were identified, including APOE, COMT, DAO, DRD1, DRD2, DRD4, DTNBP1, GABRB2, GRIN2B, HP, IL1B, MTHFR, PLXNA2, SLC6A4, TP53, and TPH1. However, some of these have later been questioned. Microdeletions and microduplications have been found to be three times more common in individuals with schizophrenia, compared to controls. Because these deletions and duplications are in genes that are overexpressed in pathways related to brain development, it is possible that the inheritance of multiple rare variants may contribute to the development of schizophrenia. Several genetic disorders feature schizophrenia as a clinical feature. The 22q11.2 Deletion Syndrome comprises many different syndromes, of which one of the most serious is DiGeorge syndrome. Children born with DiGeorge syndrome typically have heart defects, cleft palate, learning difficulties, and immune deficiency. Schizophrenia is a late manifestation, affecting around 30% of individuals. Microdeletions and duplications in chromosome 1, 2, 3, 7, 15 and 16 have also been associated with schizophrenia. In 2014, a genome-wide association study looked at the genomes of over 35,000 patients and 110,00 controls. The study identified 108 SNPs that were associated with schizophrenia, 83 of which had not been previously reported. As expected, many of these loci occurred in genes that are expressed in the brain. For example, the SNPs included a gene that encodes the dopamine D2 receptor, DRD2 (the target of antipsychotic drugs), and many genes involved in glutamine neurotransmitter pathways and synaptic plasticity (e.g., GRM3, GRIN2A, SRR, GRIA1). More surprisingly, however, associations were also enriched among genes expressed in tissues with important immune functions. In 2016, a study based on nearly 65,000 people investigated the association between schizophrenia and variation in the Major Histocompatibility Complex (MHC) locus—a region on chromosome 6 that is important for immune function. The study focused on the C4 gene (complement component 4) that exists as two distinct genes: C4A and C4B, which encode particularly structurally diverse alleles. The study found that the alleles which promoted greater expression of C4A in the brain were associated with a greater risk of schizophrenia. By using mice models, the study showed that C4 is involved in the elimination of synapses during brain maturation. In humans, “synaptic pruning” is most active during late adolescence, which coincides with the typical onset of symptoms of schizophrenia. It is therefore possible that the inheritance of specific C4A alleles could lead to “run away” synaptic pruning, increasing the risk of schizophrenia. Further research may even determine C4 as a potential therapeutic target. [from GTR]

MedGen UID:
48574
Concept ID:
C0036341
Mental or Behavioral Dysfunction
5.

Altanserin

MedGen UID:
45685
Concept ID:
C0102811
Organic Chemical; Pharmacologic Substance
6.

Ketanserin

A selective serotonin receptor antagonist with weak adrenergic receptor blocking properties. The drug is effective in lowering blood pressure in essential hypertension. It also inhibits platelet aggregation. It is well tolerated and is particularly effective in older patients. [from MeSH]

MedGen UID:
44019
Concept ID:
C0022616
Organic Chemical; Pharmacologic Substance
7.

Haloperidol

A phenyl-piperidinyl-butyrophenone that is used primarily to treat SCHIZOPHRENIA and other PSYCHOSES. It is also used in schizoaffective disorder, DELUSIONAL DISORDERS, ballism, and TOURETTE SYNDROME (a drug of choice) and occasionally as adjunctive therapy in INTELLECTUAL DISABILITY and the chorea of HUNTINGTON DISEASE. It is a potent antiemetic and is used in the treatment of intractable HICCUPS. (From AMA Drug Evaluations Annual, 1994, p279) [from MeSH]

MedGen UID:
42327
Concept ID:
C0018546
Organic Chemical; Pharmacologic Substance
8.

Phencyclidine

A hallucinogen formerly used as a veterinary anesthetic, and briefly as a general anesthetic for humans. Phencyclidine is similar to KETAMINE in structure and in many of its effects. Like ketamine, it can produce a dissociative state. It exerts its pharmacological action through inhibition of NMDA receptors (RECEPTORS, N-METHYL-D-ASPARTATE). As a drug of abuse, it is known as PCP and Angel Dust. [from MeSH]

MedGen UID:
18406
Concept ID:
C0031381
Organic Chemical; Pharmacologic Substance
9.

Down-regulation

A negative regulatory effect on physiological processes at the molecular, cellular, or systemic level. At the molecular level, the major regulatory sites include membrane receptors, genes (GENE EXPRESSION REGULATION), mRNAs (RNA, MESSENGER), and proteins. [from MeSH]

MedGen UID:
4386
Concept ID:
C0013081
Molecular Function
10.

Clozapine

A synthetic dibenzo-diazepine derivative, atypical antipsychotic Clozapine blocks several neurotransmitter receptors in the brain (dopamine type 4, serotonin type 2, norepinephrine, acetylcholine, and histamine receptors). Unlike traditional antipsychotic agents, it weakly blocks dopamine type 2 receptors. It relieves schizophrenic symptoms (hallucinations, delusions, dementia). (NCI04) [from NCI]

MedGen UID:
3128
Concept ID:
C0009079
Organic Chemical; Pharmacologic Substance
11.

Atypical antipsychotic

MedGen UID:
700121
Concept ID:
C1276996
Pharmacologic Substance
12.

Drug action

MedGen UID:
675599
Concept ID:
C0728867
Pathologic Function
13.

Ameliorated by

An ameliorating factor is defined as an external factor that leads to the manifestation of a sign or symptom in a person improving or becoming more bearable. [from HPO]

MedGen UID:
83049
Concept ID:
C0332161
Qualitative Concept
14.

Propionic acidemia

The spectrum of propionic acidemia (PA) ranges from neonatal-onset to late-onset disease. Neonatal-onset PA, the most common form, is characterized by a healthy newborn with poor feeding and decreased arousal in the first few days of life, followed by progressive encephalopathy of unexplained origin. Without prompt diagnosis and management, this is followed by progressive encephalopathy manifesting as lethargy, seizures, or coma that can result in death. It is frequently accompanied by metabolic acidosis with anion gap, lactic acidosis, ketonuria, hypoglycemia, hyperammonemia, and cytopenias. Individuals with late-onset PA may remain asymptomatic and suffer a metabolic crisis under catabolic stress (e.g., illness, surgery, fasting) or may experience a more insidious onset with the development of multiorgan complications including vomiting, protein intolerance, failure to thrive, hypotonia, developmental delays or regression, movement disorders, or cardiomyopathy. Isolated cardiomyopathy can be observed on rare occasion in the absence of clinical metabolic decompensation or neurocognitive deficits. Manifestations of neonatal and late-onset PA over time can include growth impairment, intellectual disability, seizures, basal ganglia lesions, pancreatitis, and cardiomyopathy. Other rarely reported complications include optic atrophy, hearing loss, premature ovarian insufficiency, and chronic renal failure. [from GTR]

MedGen UID:
75694
Concept ID:
C0268579
Disease or Syndrome
15.

Benzodiazepine

a drug used to relieve nervousness, tension and anxiety [from CHV]

MedGen UID:
882013
Concept ID:
C4048284
Organic Chemical; Pharmacologic Substance
16.

Membrane Transport Modulators

Agents that affect ION PUMPS; ION CHANNELS; ABC TRANSPORTERS; and other MEMBRANE TRANSPORT PROTEINS. [from MeSH]

MedGen UID:
288786
Concept ID:
C1563710
Pharmacologic Substance
17.

Molecular Mechanisms of Pharmacological Action

Pharmacological activities at the molecular level of DRUGS and other exogenous compounds that are used to treat DISEASES and affect normal BIOCHEMISTRY. [from MeSH]

MedGen UID:
226255
Concept ID:
C1258062
Molecular Function
18.

Clozaril

MedGen UID:
196238
Concept ID:
C0719386
Organic Chemical; Pharmacologic Substance
19.

Haldol

MedGen UID:
154459
Concept ID:
C0591585
Organic Chemical; Pharmacologic Substance
20.

Leponex

MedGen UID:
149159
Concept ID:
C0733560
Organic Chemical; Pharmacologic Substance
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