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1
AST Systematic name
E.C. 2.6.1.1
2
AST other name
SERUM GLUTAMIC OXALOACETIC TRANSAMINASE
3
Substrate of AST
ASPARTATE+A KETOGLUTARATE
4
Product of AST
OXALOACETATE+GLUTAMATE
5
Widely distributed in human tissue with the Highest concentration in cardiac tissue, liver, & skeletal muscle
AST
6
Evaluation of hepatocellular disorders & skeletal muscle involvement
AST
7
isoenzymes of AST in the
MITOCHONDRIA, CYTOPLASM
8
Mild degree of liver tissue injury: cytoplasmic isoenzyme is
PREDOMINANT
9
Severe tissue damage: release of
MITOCHONDRIAL ISOENZYME
10
most important cause of elevated transaminase activity in serum
LIVER DISEASE
11
AST Elevations
PULMONARY EMBOLISM, VIRAL HEPATITIS: UP TO 100x ULN, CIRRHOSIS: ~4x ULN, SKELETAL MUSCLE DISORDER: ~4-8x ULN, AMI
12
in AMI, AST Rise: Peak: Return:
6-8 HOUR, 24 HOUR, 5 DAY
13
ALT systematic name
E.C 2.6.1.2
14
ALT other name
SERUM GLUTAMIC PYRUVIC TRANSAMINASE
15
ALT Substrate
ALANINE+A KETOGLUTARATE
16
ALT Product
PYRUVATE+GLUTAMATE
17
Distributed in many tissues, High concentrations in the liver (more liver – specific enzyme among the transferases)
ALT
18
ALT has an isoenzyme
CYTOPLASMIC
19
Evaluation of hepatic disorders (hepatocellular).
ALT
20
In cases of progressive inflammatory liver diseases _is higher than_
ALT, AST
21
(AST:ALT ratio) is also known as
DE RITIS RATIO
22
(AST:ALT ratio) normally and also in viral hepatitis
<1.0
23
(AST:ALT ratio) associated with cirrhosis
>1.0 but <2.0
24
(AST:ALT ratio)associated with alcoholic hepatitis or hepatocellular carcinoma.
>2.0
25
Acute hepatocellular injury:
AST>ALT
26
longer half – life, so after 24hrs or second testing during monitoring, it becomes higher
AST
27
Method of measurment in Transaminase reactions coupled to specific DH (dehydrogenase reactions) reactions.
CONTINOUS MONITORING
28
Assay for AST activity which Coupled enzymatic reaction w/ MDH (indicator reaction). Monitor the conversion of NADH to NAD, which is directly proportional to the amount of AST in the body
KARMEN
29
Optimal pH for Karmen in AST
7.3-7.8
30
In karment method, it is Monitored at spectrophotometrically at
340 NM
31
Aspartate + a – ketoglutarate (AST) Oxaloacetate + Glutamate What reaction
ASSAY
32
Oxaloacetate + NADH + H (MDH) Malate + NAD What reaction
INDICATOR
33
Error in AST which Increase in serum AST – AST activity in RBC 15x higher in the serum.
HEMOLYSIS
34
AST activity is stable in serum for
3-4 DAY
35
Assay for ALT activity indicator
LDH
36
RR for AST
5-30 u/L
37
RR for ALT
6-37 u/L
38
Method which Coupling w/ 2,4 – DNPH (Reitman – Frankel).• Still feasible.• Phenylhydrazones of oxaloacetate & pyruvate are more chromogenic.
COLORIMETRIC
39
Simple; limited but acceptable accuracy. Mostly used in research laboratories
COLORIMETRIC
40
Product formed in colorimetric method_is measured at_
STRONG BLUE, 505 NM
41
Creatine Kinase systematic name
E.C. 2.7.3.2
42
major phosphorylated compound in muscle
PHOSPHOCREATINE
43
Forward reaction requires pH_in ck
9
44
reverse reaction requires optimum pH_in ck
6.7
45
Catalyzes reversible phosphorylation of creatine by ATP
CREATINE KINASE
46
CK is mostly found in
STRIATED MUSCLE, BRAIN TISSUE, HEART TISSUE
47
Each sub unit of Ck has a MW
40000
48
(brain type) CK1 (fastest in electrophoresis)
CK-BB
49
(hybrid type) CK2 (2nd fastest in electrophoresis)
CK-MB
50
(muscle type) CK3 (3rd fastest in electrophoresis)
CK-MM
51
All three isoenzymes of Ck are found in the
CELL CYTOSOL
52
4th isoenzyme • Located between the inner and outer membranes of the mitochondria • Differs immunologically & in electrophoretic mobility
CK-MT
53
the major serum in healthy individuals.
CK3
54
contains almost mostly of CKMM
SKELETAL MUSCLE
55
sensitive indicator of AMI
CREATINE KINASE
56
Disease in skeleteal muscle in CK
MYASTHENIA GRAVIS, MULTIPLE SCLEROSIS, POLIOMYELITIS, PARKISON'S DISEASE
57
isoenzyme will be elevated in conditions such as cerebral ischemia and cerebrovascular ischemia where blood flow to the brain is insufficient
CK-BB
58
the liver and the brain is swollen as a side effect of viralinfections
REYE'S SYNDROME
59
results in CK-MM elevations because of the involvement of muscle tissue (increased membrane permeability), the effect of thyroid hormone on enzyme activity, and, possibly, the slower clearance of CK as a result of slowermetabolism.
HYPOTHYROIDISM
60
rarely seen in the serum because Of its molecular size
CK-BB
61
associated also with patients with carcinoma of various organs such as adenocarcinoma, lung tumors, tumors of the prostate, kidney breasts and ovary the CKBB can be a useful tumor marker
CK-BB
62
the reduction of NADH to NAD ismonitored spectrophotometrically. The change in absorbance is proportional to the activity of CK.
FORWARD REACTION
63
preferred in the laboratory because it is about six times faster than the forward reaction.The rate of NADPH formation is a measure and directly proportional to the CK activity
OLIVER ROSALKI, REVERSE REACTION
64
Sources of error in Ck dtermination
ADENYLATE KINASE EFFECT, HEMOLYSIS, LIGHT
65
RR in male ck
15-160 u/L
66
RR in female Ck
15-130 u/L
67
reference and the most useful method in CK. Detection of atypical bands • Bands are visualized by incubating the support with a concentrated CK assay using the reverse reaction • in hemodialysis, albumin becomes endogenously fluorescent (stimulate the CK-1 band) • Allows visualization of AK
ELECTROPHORESIS
68
Potential for being more sensitive & precise than electrophoresis
ION EXCHANGE CHROMATOGRAPHY
69
Measure the concentration of enzyme proteins rather than the enzyme activity. • Detects enzymatically inactive CK – 2 • Infarction can be detected earlier than the other methods. • Example: emergency cases
IMMUNOASSAY
70
Anti – M or Anti – B antibodies • CK activity is measured before and after inhibition. • Residual activity - Anti – B inhibit or stop the activity of B subunit of CK-B. • Multiply by 2 for the activity of CKMM
IMMUNOINHIBITION
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