Page last updated: 2024-11-13

intrinsic factor

Description Research Excerpts Clinical Trials Roles Classes Pathways Study Profile Bioassays Related Drugs Related Conditions Protein Interactions Research Growth Market Indicators

Description

Intrinsic Factor: A glycoprotein secreted by the cells of the GASTRIC GLANDS that is required for the absorption of VITAMIN B 12 (cyanocobalamin). Deficiency of intrinsic factor leads to VITAMIN B 12 DEFICIENCY and ANEMIA, PERNICIOUS. [Medical Subject Headings (MeSH), National Library of Medicine, extracted Dec-2023]

Cross-References

ID SourceID
PubMed CID24848138
MeSH IDM0011611

Synonyms (2)

Synonym
intrinsic factor
9008-12-2

Research Excerpts

Overview

Intrinsic factor (IF(50) is a cobalamin (Cbl)-transporting protein of 50 kDa. It is a vitamin B12 binding protein that is secreted from the gastric mucosa.

ExcerptReferenceRelevance
"Intrinsic factor (IF(50)) is a cobalamin (Cbl)-transporting protein of 50 kDa, which can be cleaved into two fragments: the 30 kDa N-terminal peptide IF(30) and the 20 kDa C-terminal glycopeptide IF(20). "( Composite organization of the cobalamin binding and cubilin recognition sites of intrinsic factor.
Berglund, L; Fedosov, SN; Fedosova, NU; Moestrup, SK; Nexø, E; Petersen, TE, 2005
)
2
"Intrinsic factor (IF) is a vitamin B12 binding protein that is secreted from the gastric mucosa. "( Secretion of intrinsic factor from cultured rat gastric chief cells.
Kobayashi, S; Tanaka, T; Tani, S, 1994
)
2.1

Effects

Intrinsic factor (IF) has been expressed previously in Baculovirus with a yield (0.1-1 mg/l) that was inadequate for structural and metabolic studies. An intrinsic factor has been identified in the canine pancreas, and output and properties of this protein have been compared with those of gastric intrinsic factor in the dog.

ExcerptReferenceRelevance
"Intrinsic factor (IF) has been expressed previously in Baculovirus with a yield (0.1-1 mg/l) that was inadequate for structural and metabolic studies. "( Functional expression in Pichia pastoris of human and rat intrinsic factor.
Alpers, DH; Gordon, MM; Kinnear, MB; Richardson, MA; Russell-Jones, GJ; Wen, J; Willetts, NS, 2000
)
1.99
"Hog intrinsic factor has been purified from gastric mucosa by labile ligand affinity chromatography."( Amino terminal sequence of hog intrinsic factor.
Bucher, D; Nexo, E; Thomsen, J, 1979
)
1.03
"An intrinsic factor has been identified in the canine pancreas, and output and properties of this protein have been compared with those of gastric intrinsic factor in the dog. "( Identification and characterization of a pancreatic intrinsic factor in the dog.
Batt, RM; Horadagoda, NU; McLean, L; Morton, DB; Simpson, KW, 1989
)
1.15
"Rat intrinsic factor (IF) has been purified and proteolytic fragments were sequenced. "( Isolation and structural characterization of a cDNA clone encoding rat gastric intrinsic factor.
Alpers, DH; Banaszak, L; Dieckgraefe, BK; Leykam, JF; Seetharam, B, 1988
)
1.06

Toxicity

ExcerptReferenceRelevance
" As with virtually all drugs used in the practice of medicine, cimetidine is not without its adverse effects."( A consideration of the adverse effects of cimetidine.
McGuigan, JE, 1981
)
0.26

Compound-Compound Interactions

ExcerptReferenceRelevance
"For the quantitation of intrinsic factor (IF) mRNA, an assay based on competitive reverse transcription and subsequent polymerase chain reaction (RT-PCR) combined with temperature gradient gel electrophoresis (TGGE) was established and validated with respect to precision and accuracy."( Multiplex reverse transcription polymerase chain reaction combined with temperature gradient gel electrophoresis as a tool for the normalized quantitation of intrinsic factor mRNA.
Arnold, GJ; Solch, JP, 1996
)
0.8

Bioavailability

ExcerptReferenceRelevance
" When taken with food, rufinamide is relatively well absorbed in the lower dose range, with approximately dose-proportional plasma concentrations up to 1,600 mg/day, but less than dose-proportional plasma concentrations at higher doses due to reduced oral bioavailability."( Rufinamide: clinical pharmacokinetics and concentration-response relationships in patients with epilepsy.
Cloyd, J; Critchley, D; Fuseau, E; Perucca, E, 2008
)
0.35

Dosage Studied

ExcerptRelevanceReference
" Limited dose-response studies showed that 0-25 mug urogastrone kg--1 hr--1 resulted in inhibition of acid output of 80% and was not associated with clinical side-effects."( Effect of urogastrone on gastric secretion and plasma gastrin levels in normal subjects.
Elder, JB; Ganguli, PC; Gerring, EL; Gillespie, IE; Gregory, H, 1975
)
0.25
" During dosing with omeprazole, basal gastric acid output diminished by 94%, and pentagastrin-stimulated acid output by 97%."( Repeated high oral doses of omeprazole do not affect intrinsic factor secretion: proof of a selective mode of action.
Den Hollander, W; Festen, HP; Meuwissen, SG; Tuynman, HA, 1989
)
0.53
" EGF (10(-7) M) significantly inhibited the histamine dose-response curve for [14C]AP and IF, but a relatively greater inhibition was observed at higher histamine concentration."( Epidermal growth factor (EGF) inhibits both intrinsic factor secretion and acid secretion in histamine-stimulated isolated gastric glands.
Modlin, IM; Rackoff, PJ; Tyshkov, M; Zdon, MJ, 1988
)
0.54
" The blocking factor was present in serum IgG fractions, and serum and IgG fractions gave parallel dose-response and dilution curves."( Serum from patients with pernicious anaemia blocks gastrin stimulation of acid secretion by parietal cells.
de Aizpurua, HJ; Toh, BH; Ungar, B, 1985
)
0.27
" The technic described here enables the dosage of low quantities of IF with a 7 per cent coefficient of variation."( [Focus on the radioimmunoassay of intrinsic factor in cats and rats].
Dubrasquet, M; Nicolas, JP; Perrin, MO, 1983
)
0.54
[information is derived through text-mining from research data collected from National Library of Medicine (NLM), extracted Dec-2023]

Research

Studies (1,805)

TimeframeStudies, This Drug (%)All Drugs %
pre-19901501 (83.16)18.7374
1990's111 (6.15)18.2507
2000's84 (4.65)29.6817
2010's76 (4.21)24.3611
2020's33 (1.83)2.80
[information is prepared from research data collected from National Library of Medicine (NLM), extracted Dec-2023]

Market Indicators

Research Demand Index: 85.76

According to the monthly volume, diversity, and competition of internet searches for this compound, as well the volume and growth of publications, there is estimated to be very strong demand-to-supply ratio for research on this compound.

MetricThis Compound (vs All)
Research Demand Index85.76 (24.57)
Research Supply Index7.55 (2.92)
Research Growth Index4.37 (4.65)
Search Engine Demand Index165.42 (26.88)
Search Engine Supply Index2.11 (0.95)

This Compound (85.76)

All Compounds (24.57)

Study Types

Publication TypeThis drug (%)All Drugs (%)
Trials18 (0.95%)5.53%
Reviews171 (9.06%)6.00%
Case Studies78 (4.13%)4.05%
Observational3 (0.16%)0.25%
Other1,617 (85.69%)84.16%
[information is prepared from research data collected from National Library of Medicine (NLM), extracted Dec-2023]