1 Faisal Plasma Proteins
1 Faisal Plasma Proteins
1 Faisal Plasma Proteins
spin blood
Serum liquid separate into 2 parts
WBCs RBCs
Clotted blood
cells
Separation of Components
Plasma = Less Dense Platelets / WBCs Hematocrit Packed Cells More Dense
Components of Plasma
Blood plasma Consists of:
Water 90% Plasma Proteins 6-8 % Electrolytes (Na+ & Cl-) 1%
Other components:
Nutrients (e.g. Glucose and amino acids) Hormones (e.g. Cortisol, thyroxine) Wastes (e.g. Urea) Blood gases (e.g. CO2, O2)
Plasma Proteins
Plasma Proteins: A complex mixture that includes hundreds of proteins albumin globulins fibrinogen
Plasma Proteins
Maintaining colloid osmotic balance (albumin) Buffering pH changes Transport of materials through blood (such as water-insoluble hormones) Antibodies (e.g. gamma globulins, immunoglobulins) Clotting factors (e.g. fibrinogen) Antiproteases
52 58 2.4 4.4
34 50 2-4
1-globulins: thyroxin-binding globulin, transcortin, 1-acid glycoprotein, 1-antitrypsin, 1-lipoprotein (HDL), 1-fetoprotein
ceruloplasmin
6 10 8.5 14.5 10 21
59 6 11
-globulins: transferrin, hemopexin, lipoprotein (LDL), fibrinogen, C-reactive protein, C3 and C4 components of the complement system
-globulins: IgG, IgM, IgA, IgD, IgE
8 15
Elevation vary from 50% to 1000 fold These proteins play a role in bodys response to inflammation Examples: C-reactive protein, 1-antitrypsin, haptoglobin
Albumin
60 % of the total plasma proteins. Level varies with age 3.4-4.7 g/100ml 12 grams are produced daily in the liver
25 % of the total protein synthesis by liver, one half of the secreted proteins.
Synthesis of Albumin
Preproalbumin signal peptide Proalbumin hexapeptide Albumin
Albumin Structure
69 kDa
Ellipsoidal shape Partial digestion with protease three domains Highly polar with three hydrophobic clefts Anionic at pH 7.4 with 20 negative charges
10
Ca2+ Cu+
B B B A AB A B
A B A
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Ca2+
Ca2+
Liver disease
Total protein can be normal ( globulin, albumin)
Gastrointestinal loss
Leakage of fluid from inflamed or diseased mucosa
Renal disease
Penetration of albumin through glomerulus
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Analbuinemia
Absence of Albumin from the plasma Rare condition Defect in the processing of mRNA of albumin Autosomal recessive inheritance Moderate edema
Compensation by synthesis of other plasma proteins
Prealbumin
Migrates ahead of albumin Combines with T4 (Thyroxine) and T3 Retinol binding protein Short half life (2 Days) Sensitive marker of poor protein nutrition Decreased in Hepatic damage Tissue necrosis
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1-Antiproteinase
Also known as 1-antitrypsin Inhibits trypsin, elastase, and other proteases ~52 kDa Glycoprotein
( 394 A.Acids with 3 oligosaccharide chains)
1-Antiproteinase (polymorphism)
Many polymorphic forms The major genotype is MM Alleles PiM, PiS, PiZ, PiF Deficiency can develop a lung disease (emphysema)
Individuals with ZZ genotype and PiSZ heterozygotes Individuals with MS or MZ genotype usually not affected
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Inactive Elastase
Active Elastase
Tissue damage
15
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Haptoglobin (Hp)
2 glycoprotein (90kDa) Synthesized mainly by hepatocytes Two kinds of polypeptide chains
Two chains One chain
Haptoglobin Function
Binding of free hemoglobin 10% of the Hb degraded each day is released into the plasma Hb (65 kDa) Hb:Hp Complex (155 kDa) Kidney
Kidney
Uptake by liver
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Haptoglobin level
Measured as Hb binding capacity
Normally 40-180 mg of Hb binding capacity
Level in hemolytic anemia Hb-Hp complex has shorter half-life than that of Hp
t1/2 of Hp 5 days t1/2 of Hb-Hp 90 minutes
1-fetoprotein (AFP)
Was first discovered in the serum of the fetus. Very low level in adult. Detectable in the maternal blood in pregnancy Elevated level in some congenital defects Low level increased risk of Downs syndrome High level in many cases of liver cancer
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2-Macroglobulin
Large protein 720 kDa Tetramer of 4 identical chains 8-10 % of the total plasma proteins Synthesized by
Monocytes Hepatocytes Astrocytes
2-Macroglobulin
Pan proteinase inhibitor
Trypsin, pepsin, plasmin, thrombin inhibitor of
Coagulation Fibrinolysis
Binding to many cytokines (signal molecules) and directing them to their target cells
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Ceruloplasmin
2-globulin (160 kDa) Binds copper
Tight binding 90% of the plasma copper ( 6 atoms/molecule) Albumin binds the remaining 10%
Excess Copper copper can be harmful Metallothioneins, a group of small proteins regulate tissue level of copper
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C-Reacrive Protein
Undetectable in healthy individuals In patients with diverse inflammatory diseases
Acute rheumatic fever, bacterial infection, gout .. Tissue damage
Reacts with C substance ( polysaccharide in Pnumococci and molecular groups on a wide variety of bacteria
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Blood Overview plasma ~55% of blood H2O plasma proteins ions nutirents wastes hormones 92% 7%
Blood plasma proteins: albumins 60% of plasma proteins made in liver transport: fatty acids hormones other stuff
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Blood plasma proteins: globulins 35% of plasma proteins two types immunoglobulins aka., antibodies (Ab) transport globulins (thyroid H) hormone-binding metalloaproteins (iron) apolipoproteins (lipids) steroid-binding (testosterone)
II.
III. Abnormal excretion or degradation A. nephrotic syndrome B. burns C. hemorrhage D. certain catabolic states E. loss of protein from the digestive tract IV. Rare congenital defects A. hypoalbuminemia B. analbuminemia
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