ACP, ALP, AMYLASE, LIPASE, GGT Flashcards
belongs to the same group of phosphatase enzymes as ALP and is a hydrolase that catalyze the same reactions
ACP
Major difference between ACP and ALP is the pH where ACP activity takes place at a pH of
5.0 (acidic)
ACP is buffered at pH
ALP is buffered at pH
6
10.2
Belongs to a group of enzymes that catalyzes the hydrolysis of various phosphomonoesters in alkaline pH
ALP
Considered a non-specific enzyme, able to react with many different substrate
ALP
It liberates inorganic phosphate from an organic phosphate ester w/ the concomitant production of an alcohol
ALP
is required as an activator of ALP
Mg
GGT Chemical Name
Gamma-glutamyl transpeptidase
Catalyzes the transfer of y-glutamyl residue from y-glutamyl peptides to amino acids, other peptides, or H2O
GGT
Cell membrane-bound
GGT
Largest amounts found in the kidney
GGT
Small accumulations in the liver (hepatobiliary tree) and heart
GGT
GGT Half-life:
7 - 10 days
GGT In alcoholic liver disease:
28 days
AMS Chemical Name:
α-1,4-glucan-4-glucanohydrolase
Hydrolases are enzymes that catalyzes the breakdown of starch and glycogen
AMS
Starch is made up of both
Amylose and Amylopectin
-long unbranched chain of glucose linked by a,1-4 glycosidic bonds (glucose molecule)
Amylose
-branched chain polisaccharide with a,1-6 linkage (polysaccharide)
Amylopectin
a-AMS attacks only the a,1-4 glycosidic bonds to produce the degradation products:
o Glucose
o Maltose
o intermediate chain (Dextrin)
MW: 45,000 daltons
considered the smallest enzyme and can pass through glomerular filter
top of blood vessels located between the bowman’s capsule within the kidney
Glomerulus
microscopic filter”
Glomerulus
Blood filtration in the kidney where fluids, ions, glucose, and waste products are being removed from the glomerular capillaries
Glomerulus
AMS Metalloenzyme:
Calcium
Requirement for the functional integrity of amylase
Calcium
AMS Optimum pH:
6.9 – 7.0 in serum
Normal serum contains both AMS
salivary and pancreatic AMS
Normal amylase / creatinine ratio =
1.0% – 4.0% (0.01 – 0.04)
A:C ratio (Acute Pancreatitis) =
> 4.0% (up to 15%)
An elevated amylase-creatinine clearance ratio has been established as being highly specific for the diagnosis of
acute pancreatitis
Calculates the ratio of amylase to creatinine that if both filtered by the kidney
amylase-creatinine clearance ratio
LPS Chemical name:
Triacylglycerol Acylhydrolase
ACP SYSTEMATIC NAME
E.C. 3.1.3.2
ALP SYSTEMATIC NAME
E.C. 3.1.3.1
GGT SYSTEMATIC NAME
E.C. 2.3.2.1
AMYLASE SYSTEMATIC NAME
E.C. 3.2.1.1
LIPASE SYSTEMATIC NAME
E.C. 3.1.1.3
inhibited by tartrate
Prostatic ACP (band 1)
greatest activity in the prostate gland
Prostatic ACP (band 1)
fastest migrating ACP isoenzyme
Prostatic ACP (band 1)
2nd fastest migrating ACP isoenzyme
Bone - osteoclasts (band 5)
major form in plasma ACP
Platelets, RBCs & Monocytes (band 3)
Resistant to tartrate inhibition
Bone - osteoclasts (band 5)
differentiates prostatic fractions from, bone-osteoclast fractions in ACP
Inhibition
differentiates bone fractions from, liver fractions in ALP
Enzymes or lectins
Rate of mobility of ALP ISOENZYMES
- Liver isoenzyme – migrates the fastest
- Bone isoenzyme – 2nd
- Placental isoenzyme – 3rd
- Intestinal isoenzyme – 4th
Its activity starts in the salivary gland where it initiates the hydrolysis of starch while food is in the mouth and esophagus
S-type Isoamylase
Its action is terminated by the acidity of the stomach
S-type Isoamylase
Inhibited by monoclonal antibody
S-type Isoamylase
Inhibited by protein isolated from wheat
S-type Isoamylase
represent 2/3 of AMS activity of normal serum
S-type Isoamylase
Synthesized by the pancreatic acinar cells and secreted into the intestinal tract via the pancreatic duct system
P-type Isoamylase
Its action is favored by the mildly alkaline condition of the duodenum
P-type Isoamylase
Inhibited by monoclonal antibody
P-type Isoamylase
Inhibited by monoclonal antibody
P-type Isoamylase
M predominates in the normal urine
P-type Isoamylase
Migrates most quickly in terms of electrophoretic migration in AMS
S1 (fastest), S2, S3
P1 (follows S3), P2, P3
Other organs of S-type Isoamylase
Fallopian tube and lungs
Favoured by the mild alkaline conditions in the duodenum
P-type Isoamylase
The isoenzymes of salivary origin migrates most quickly (?) , P type are slower (?)
(S1,S2,S3)
(P1,P2,P3)
The most commonly observed fractions of AMS
P2, S1 and S2
In acute pancreatitis and renal failure: predominates
P3
Abnormal amylase (usually the S-type) in combination with Immunoglobulins (IgA or IgG) or other high MW proteins
Macroamylases
Not found in urine and concentrated in serum/plasma
Macroamylases
No clinical significance
Macroamylases
ELEVATIONS Prostatic isoenzyme
- Prostatic Cancerm
- Prostatic hyperplasia & prostatic infarction
- Ureteral Obstruction, carcinoid tumors of rectum & prostatic massage
- Medico-legal
: ACP is inferior to PSA
Prostatic Cancer
DECREASE Bone isoenzyme
• Active osteoclast-mediated bone resorption
• Gaucher’s cells
• Hairy cell leukemia
best marker for prostatic cancer; leading cause of death from cancer in the Ph
Prostate specific acntigen
benign condition where the prostatic gland enlargement; not cancerous
Prostatic hyperplasia
common among men aging > 60
Ureteral Obstruction
prostatic gland enlargement blocks urine flow
Ureteral Obstruction
a tumor presses the division that separates the prostate gland and the rectum
Carcinoid tumors of rectum
performed to extract a prostatic secretions
Prostatic massage
performed by stoking the prostate several times
Prostatic massage
performed in combination w/ the digital rectal exam
Prostatic massage
o px is asked to bend forward
o doctor inserts finger to the rectum until prostate gland is reached to check for enlargement
digital rectal exam
usage of bone rigidity, causing loss of important enzymes
Active osteoclast-mediated bone resorption
infiltration of the bone marrow and other tissues by Gaucher cells, which are rich in ACP activity
Gaucher’s cells
slow growing cancer of the bones
Hairy cell leukemia
affects the bone marrow making too much B lymphocytes
Hairy cell leukemia
ALP ELEVATIONS
• Obstructive hepatic disorder (Liver isoenzyme)
• Paget’s disease (Osteitis deformans)
• increased osteoblastic activity (Bone isoenzyme)
• DM, renal failure and cirrhosis (Intestinal isoenzyme)
ALP DECREASE
Chronic Kidney Disease patients
Low ALP and low Bone Turnover rate
ALP
- bone ALP isoform in the serum of dialysis patients
B1x
Blockage of bile ducts and pancreatic ducts
Obstructive hepatic disorder (obstructive jaundice)
Can cause affected bones to become fragile
Paget’s disease
ALP Isoenzymes in cancer
Carcinoplacental Alkaline Phosphatases
Carcinoplacental Alkaline Phosphatases
Regan isoenzyme
Nagao isoenzyme
Kasahara isoenzyme
patients w/ a particular type of lung CA
Regan isoenzyme
Caused by ectopic production of by cancerous tissues
Regan isoenzyme
Low incidence but used in monitoring therapy
Regan isoenzyme
Adenocarcinoma of the pancreas and the bile ducts
Nagao isoenzyme
Variant of regan isoenzyme
Nagao isoenzyme
– hepatoma
Kasahara isoenzyme
GGT ELEVATIONS
• Liver damage
• Smoking
• Ethanol abuse
• Medication (anticonvulsant)
GGT DECREASE
• Pregnancy
• Oral contraceptives
GGT - major source
Liver damage
- moderate = 10%
Smoking
Ethanol abuse
- heavy = 20%
• Medication (anticonvulsant)
• Medication (anticonvulsant)
o Carbamazepine o Phenytoin o Barbiturates o Valproic acid