Proteins Flashcards
Not readily demonstrated or visible in typical serum electrophoresis
Prealbumin (Transthyretin)
Found between the anode and albumin region
Prealbumin (Transthyretin)
Indicator of nutrition
Prealbumin (Transthyretin)
Binds thyroid hormones (T3, T4)
Prealbumin (Transthyretin)
Binds retinol-binding protein (Vit A)
Prealbumin (Transthyretin)
Binds bilirubin, steroids, fatty acids
Albumin
Major contributor to oncotic pressure
Albumin
Highest concentration in the plasma or serum
Albumin
Most abundant, Smallest and fastest migration
Albumin
Highest peak in electrophoresis
Albumin
Predominant protein present in the diet
Albumin
↓plasma volume ↑concentration
Albumin
α1-Globulin proteins
α1 - Antitrypsin
α1 - Fetoprotein
α1 - acid glycoprotein
α1 - Lipoprotein
α1 - Antichymotrypsin
Inter-α-trypsin inhibitor
Gc-globulin
Gc: group specific component
Protease inhibitor
α1 - Antitrypsin
α2-Macroglobulin
Principal fetal protein
a1-fetoprotein
a1-fetoprotein is INCREASED in:
spina bifida
neural tube defects
fetal distress
a1-fetoprotein is DECREASED in:
Down syndrome
Trisomy 18
In adults, used as tumor marker (malignancy hepatoma)
- Hepatocellular conditions in adults
a1-fetoprotein
Transport lipids from the tissues (HDL)
a1-lipoprotein
Inhibits serine proteinases
a1-antichymotrypsin
Inter-α-trypsin inhibitor
Transports Vitamin D and binds actin
- Vit. D is a cholecalciferol
Gc-globulin
Gc: group specific component
α2-Globulin proteins
Haptoglobin
Ceruloplasmin
α2 - Macroglobulin
Binds with free hemoglobin
- Hb released from RBC during hemolytic conditions (intravascular)
Haptoglobins
Decreased ceruloplasmin is seen in these conditions
Wilson’s dse
Menkes syn. (kinkey hair dse.)
Kayser Fleisher rings in cornea
β-Globulin proteins
Pre-β-lipoprotein (VLDL)
Transferrin
Hemopexin
β-Lipoprotein (LDL)
β2-Microglobulin
C4, C3, C1q complement
Fibrinogen
CRP
Transports lipids (endogenous tgl in the liver) (VLDL triglyceride)
Pre-β-lipoprotein (VLDL)
Found between the α2 and β region
Pre-β-lipoprotein (VLDL)
Transport Iron (bone marrow or liver)
Transferrin
Transferrin
Inc:
Dec:
↑ IDA: Decreased iron in the circulation
↓ Hemochromatosis: Excess iron in the circulation
Binds heme
Hemopexin
Transports lipids (dietary) (LDL cholesterol)
β-Lipoprotein (LDL)
Component of HLA molecules (Human Leukocyte Antigen)
β2-Microglobulin
Immune response
• Named as Complement because their presence would enhance the
activity of antibodies in eliminating pathogens
C4, C3, C1q complement
Precursor of fibrin clot
Factor I
Found in β region
Fibrinogen
Motivates phagocytosis in inflammation
- Promotes migration of WBCs to the site of inflammation
CRP
First to increase during acute inflammation
CRP
Present in the B region when subjected to electrophoresis
CRP
produced in the liver by plasma cells) (nearest the cathode; farthest the anode)
found in the gamma region when subjected to electrophoresis (negative charge)
γ-Gamma-Globulins
Antibodies predominantly found in the serum of healthy individuals
IgG
Predominant in the Secondary or the memory or the anamnestic response
IgG
Smallest Ab
IgG
Only antibody that can cross the placenta
IgG
Can provide neonatal immunity
IgG
Antibodies in the secretion
Can provide mucosal immunity
IgA
Also present in the colostrum (breastmilk) along with IgG
IgA
Antibodies in early response
IgM
Predominant antibody in primary immune response
IgM
Biggest Ab
IgM
Antibodies (reagen, allergy)
IgE
Increased in parasitic infection (helminthic)
IgE
Reaginic Ab
IgE
Surface antibody
• Not yet fully established in terms of the function
IgD
Oxygen carrier in muscles
Myoglobin
Cardiac Marker (AMI)
• Earliest to increase in case of acute MI
Myoglobin
↑ 2-3 hours of onset, peak at 8-12 hours of MI
Myoglobin
↑ in crushing injury and muscle dystrophy
Myoglobin
Cardiac marker for acute coronary syndrome
Troponin
Neurohormones that affect body fluid homeostasis and blood pressure
BNP
Marker for congestive heart failure
BNP
• Cellular interaction (e.g. cell adhesion)
• Adherence of the placenta to the uterus
▪ ↑ - Preterm labor and delivery
Fibronectin
Proteolytic fragment of collagen
Cross-Linked
C-Telopeptides
Biochemical marker of bone resorption (destruction)
Cross-Linked
C-Telopeptides
Synonym: Prostaglandin D synthase
β-Trace Protein
Marker for CSF leakage (e.g. head injuries)
β-Trace Protein
↑ Damage in blood brain barrier
β-Trace Protein
Cysteine proteinase inhibitor
Cystatin C
Serum marker for glomerular filtration rate (kidney function., for DM px)
Cystatin C
Fibrous protein aggregates formed from alteration of β pleated sheaths
Amyloid
Differential diagnosis of Alzheimer
Amyloid
Low Aβ42 with high Tau proteins
Amyloid
Acute phase reactants
a1-antitrypsin
a1-acid glycoprotein
haptoglobins
ceruloplasmin
hemopexin
CRP