| Systematic (IUPAC) name | |
|---|---|
| see Heparin structure | |
| Clinical data | |
| AHFS/Drugs.com | monograph |
| Pregnancy cat. | C |
| Legal status | ? |
| Routes | i.v., s.c. |
| Pharmacokinetic data | |
| Bioavailability | nil |
| Metabolism | hepatic |
| Half-life | 1.5 hrs |
| Excretion | ? |
| Identifiers | |
| CAS number | 9005-49-6 |
| ATC code | B01AB01 C05BA03 S01XA14 |
| PubChem | CID 772 |
| DrugBank | DB01109 |
| ChemSpider | 17216115 |
| UNII | T2410KM04A |
| ChEMBL | CHEMBL526514 |
| Chemical data | |
| Formula | C12H19NO20S3 |
| Mol. mass | 12000–15000 g/mol |
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Heparin (from Ancient Greek ηπαρ (hepar), liver), also known as unfractionated heparin, a highly sulfated glycosaminoglycan, is widely used as an injectable anticoagulant, and has the highest negative charge density of any known biological molecule.[1] It can also be used to form an inner anticoagulant surface on various experimental and medical devices such as test tubes and renal dialysis machines.
Although it is used principally in medicine for anticoagulation, its true physiological role in the body remains unclear, because blood anti-coagulation is achieved mostly by heparan sulfate proteoglycans derived from endothelial cells.[2] Heparin is usually stored within the secretory granules of mast cells and released only into the vasculature at sites of tissue injury. It has been proposed that, rather than anticoagulation, the main purpose of heparin is defense at such sites against invading bacteria and other foreign materials.[3] In addition, it is conserved across a number of widely different species, including some invertebrates that do not have a similar blood coagulation system.
Contents |
Native heparin is a polymer with a molecular weight ranging from 3 kDa to 30 kDa, although the average molecular weight of most commercial heparin preparations is in the range of 12 kDa to 15 kDa.[4] Heparin is a member of the glycosaminoglycan family of carbohydrates (which includes the closely related molecule heparan sulfate) and consists of a variably sulfated repeating disaccharide unit.[5] The main disaccharide units that occur in heparin are shown below. The most common disaccharide unit is composed of a 2-O-sulfated iduronic acid and 6-O-sulfated, N-sulfated glucosamine, IdoA(2S)-GlcNS(6S). For example, this makes up 85% of heparins from beef lung and about 75% of those from porcine intestinal mucosa.[6] Not shown below are the rare disaccharides containing a 3-O-sulfated glucosamine (GlcNS(3S,6S)) or a free amine group (GlcNH3+). Under physiological conditions, the ester and amide sulfate groups are deprotonated and attract positively charged counterions to form a heparin salt. It is in this form that heparin is usually administered as an anticoagulant.
One unit of heparin (the "Howell Unit") is an amount approximately equivalent to 0.002 mg of pure heparin, which is the quantity required to keep 1 mL of cat's blood fluid for 24 hours at 0 °C.[7]
The three-dimensional structure of heparin is complicated by the fact that iduronic acid may be present in either of two low-energy conformations when internally positioned within an oligosaccharide. The conformational equilibrium is influenced by sulfation state of adjacent glucosamine sugars.[8] Nevertheless, the solution structure of a heparin dodecasaccharide composed solely of six GlcNS(6S)-IdoA(2S) repeat units has been determined using a combination of NMR spectroscopy and molecular modeling techniques.[9] Two models were constructed, one in which all IdoA(2S) were in the 2S0 conformation (A and B below), and one in which they are in the 1C4 conformation (C and D below). However there is no evidence to suggest that changes between these conformations occur in a concerted fashion. These models correspond to the protein data bank code 1HPN.
In the image above:
In these models, heparin adopts a helical conformation, the rotation of which places clusters of sulfate groups at regular intervals of about 17 angstroms (1.7 nm) on either side of the helical axis.
Heparin is a naturally occurring anticoagulant produced by basophils and mast cells.[10] Heparin acts as an anticoagulant, preventing the formation of clots and extension of existing clots within the blood. While heparin does not break down clots that have already formed (unlike tissue plasminogen activator), it allows the body's natural clot lysis mechanisms to work normally to break down clots that have formed. Heparin is generally used for anticoagulation for the following conditions:
Heparin and its low molecular weight derivatives (e.g. enoxaparin, dalteparin, tinzaparin) are effective at preventing deep vein thromboses and pulmonary emboli in patients at risk,[11][12] but there is no evidence that any one is more effective than the other in preventing mortality.[13] Heparin binds to the enzyme inhibitor antithrombin III (AT) causing a conformational change that results in its activation through an increase in the flexibility of its reactive site loop.[14] The activated AT then inactivates thrombin and other proteases involved in blood clotting, most notably factor Xa. The rate of inactivation of these proteases by AT can increase by up to 1000-fold due to the binding of heparin.[15]
AT binds to a specific pentasaccharide sulfation sequence contained within the heparin polymer:
GlcNAc/NS(6S)-GlcA-GlcNS(3S,6S)-IdoA(2S)-GlcNS(6S)
The conformational change in AT on heparin-binding mediates its inhibition of factor Xa. For thrombin inhibition, however, thrombin must also bind to the heparin polymer at a site proximal to the pentasaccharide. The highly negative charge density of heparin contributes to its very strong electrostatic interaction with thrombin.[1] The formation of a ternary complex between AT, thrombin, and heparin results in the inactivation of thrombin. For this reason, heparin's activity against thrombin is size-dependent, the ternary complex requiring at least 18 saccharide units for efficient formation.[16] In contrast, anti-factor Xa activity requires only the pentasaccharide binding site.
This size difference has led to the development of low-molecular-weight heparins (LMWHs) and, more recently, to fondaparinux as pharmaceutical anticoagulants. Low-molecular-weight heparins and fondaparinux target anti-factor Xa activity rather than anti-thrombin (IIa) activity, with the aim of facilitating a more subtle regulation of coagulation and an improved therapeutic index. The chemical structure of fondaparinux is shown above. It is a synthetic pentasaccharide, whose chemical structure is almost identical to the AT binding pentasaccharide sequence that can be found within polymeric heparin and heparan sulfate.
With LMWH and fondaparinux, there is a reduced risk of osteoporosis and heparin-induced thrombocytopenia (HIT). Monitoring of the activated partial thromboplastin time is also not required and does not reflect the anticoagulant effect, as APTT is insensitive to alterations in factor Xa.
Danaparoid, a mixture of heparan sulfate, dermatan sulfate, and chondroitin sulfate, can be used as an anticoagulant in patients that have developed HIT. Because danaparoid does not contain heparin or heparin fragments, cross-reactivity of danaparoid with heparin-induced antibodies is reported as less than 10%.[17]
The effects of heparin are measured in the lab by the partial thromboplastin time (aPTT), (the time it takes the blood plasma to clot).
Heparin is given parenterally because it is not absorbed from the gut, due to its high negative charge and large size. Heparin can be injected intravenously or subcutaneously (under the skin); intramuscular injections (into muscle) are avoided because of the potential for forming hematomas. Because of its short biologic half-life of approximately one hour, heparin must be given frequently or as a continuous infusion. However, the use of low-molecular-weight heparin (LMWH) has allowed once-daily dosing, thus not requiring a continuous infusion of the drug. If long-term anticoagulation is required, heparin is often used only to commence anticoagulation therapy until the oral anticoagulant warfarin takes effect.
Details of administration are available in clinical practice guidelines by the American College of Chest Physicians:[18]
Pharmaceutical-grade heparin is derived from mucosal tissues of slaughtered meat animals such as porcine (pig) intestine or bovine (cow) lung.[19] Advances to produce heparin synthetically have been made in 2003 and 2008.[20]
A serious side-effect of heparin is heparin-induced thrombocytopenia (HIT). HIT is caused by an immunological reaction that makes platelets a target of immunological response, resulting in the degradation of platelets. This is what causes thrombocytopenia. This condition is usually reversed on discontinuation, and can generally be avoided with the use of synthetic heparins. There is also a benign form of thrombocytopenia associated with early heparin use, which resolves without stopping heparin.
There are two nonhemorrhagic side-effects of heparin treatment. The first is elevation of serum aminotransferase levels, which has been reported in as many as 80% of patients receiving heparin. This abnormality is not associated with liver dysfunction, and it disappears after the drug is discontinued. The other complication is hyperkalemia, which occurs in 5 to 10% of patients receiving heparin, and is the result of heparin-induced aldosterone suppression. The hyperkalemia can appear within a few days after the onset of heparin therapy. More rarely, side-effects include alopecia and osteoporosis can occur with chronic use.
As with many drugs, overdoses of heparin can be fatal. In September 2006, heparin received worldwide publicity when 3 prematurely born infants died after they were mistakenly given overdoses of heparin at an Indianapolis hospital.[21]
Protamine sulfate (1 mg per 100 units of heparin that had been given over the past four hours) has been given to counteract the anticoagulant effect of heparin.[22]
Heparin is one of the oldest drugs currently in widespread clinical use. Its discovery in 1916 predates the establishment of the Food and Drug Administration of the United States, although it did not enter clinical trials until 1935.[23] It was originally isolated from canine liver cells, hence its name (hepar or "ήπαρ" is Greek for "liver"). Heparin's discovery can be attributed to the research activities of two men: Jay McLean and William Henry Howell.
In 1916, McLean, a second-year medical student at Johns Hopkins University, was working under the guidance of Howell investigating pro-coagulant preparations, when he isolated a fat-soluble phosphatide anti-coagulant in canine liver tissue. It was Howell in 1918 who coined the term heparin for this type of fat-soluble anticoagulant in 1918. In the early 1920s, Howell isolated a water-soluble polysaccharide anticoagulant, which was also termed heparin, although it was distinct from the phosphatide preparations previously isolated. It is probable that McLean's work as a surgeon changed the focus of the Howell group to look for anticoagulants, which eventually led to the polysaccharide discovery.
In the 1930s, several researchers were investigating heparin. Erik Jorpes at Karolinska Institutet published his research on the structure of heparin in 1935,[24] which made it possible for the Swedish company Vitrum AB to launch the first heparin product for intravenous use in 1936. Between 1933 and 1936, Connaught Medical Research Laboratories, then a part of the University of Toronto, perfected a technique for producing safe, non-toxic heparin that could be administered to patients in a salt solution. The first human trials of heparin began in May 1935, and, by 1937, it was clear that Connaught's heparin was a safe, easily available, and effective blood anticoagulant. Prior to 1933, heparin was available, but in small amounts, and was extremely expensive, toxic, and, as a consequence, of no medical value.[25]
A posthumous attempt to nominate McLean for a Nobel Prize failed.
As detailed in the table below, there is a great deal of potential for the development of heparin-like structures as drugs to treat a wide range of diseases, in addition to their current use as anticoagulants.[26][27]
| Disease states sensitive to heparin | Heparin's effect in experimental models | Clinical status |
| Adult respiratory distress syndrome | Reduces cell activation and accumulation in airways, neutralizes mediators and cytotoxic cell products, and improves lung function in animal models | Controlled clinical trials |
| Allergic encephalomyelitis | Effective in animal models | - |
| Allergic rhinitis | Effects as for adult respiratory distress syndrome, although no specific nasal model has been tested | Controlled clinical trial |
| Arthritis | Inhibits cell accumulation, collagen destruction and angiogenesis | Anecdotal report |
| Asthma | As for adult respiratory distress syndrome, however it has also been shown to improve lung function in experimental models | Controlled clinical trials |
| Cancer | Inhibits tumour growth, metastasis and angiogenesis, and increases survival time in animal models | Several anecdotal reports |
| Delayed type hypersensitivity reactions | Effective in animal models | - |
| Inflammatory bowel disease | Inhibits inflammatory cell transport in general. No specific model tested | Controlled clinical trials |
| Interstitial cystitis | Effective in a human experimental model of interstitial cystitis | Related molecule now used clinically |
| Transplant rejection | Prolongs allograft survival in animal models | - |
- indicates no information available
As a result of heparin's effect on such a wide variety of disease states a number of drugs are indeed in development whose molecular structures are identical or similar to those found within parts of the polymeric heparin chain.[26]
| Drug molecule | Effect of new drug compared to heparin | Biological activities |
| Heparin tetrasaccharide | Non-anticoagulant, non-immunogenic, orally active | Anti-allergic |
| Pentosan polysulfate | Plant derived, little anticoagulant activity, Anti-inflammatory, orally active | Anti-inflammatory, anti-adhesive, anti-metastatic |
| Phosphomannopentanose sulfate | Potent inhibitor of heparanase activity | Anti-metastatic, anti-angiogenic, anti-inflammatory |
| Selectively chemically O-desulphated heparin | Lacks anticoagulant activity | Anti-inflammatory, anti-allergic, anti-adhesive |
Either chemical or enzymatic de-polymerisation techniques or a combination of the two underlie the vast majority of analyses carried out on the structure and function of heparin and heparan sulfate (HS).
The enzymes traditionally used to digest heparin or HS are naturally produced by the soil bacterium Pedobacter heparinus (formerly named Flavobacterium heparinum).[28] This bacterium is capable of utilizing either heparin or HS as its sole carbon and nitrogen source. In order to do so, it produces a range of enzymes such as lyases, glucuronidases, sulfoesterases, and sulfamidases.[29] It is the lyases that have mainly been used in heparin/HS studies. The bacterium produces three lyases, heparinases I (EC 4.2.2.7), II (no EC number assigned) and III (EC 4.2.2.8) and each has distinct substrate specificities as detailed below.[30][31]
| Heparinase enzyme | Substrate specificity |
| Heparinase I | GlcNS(±6S)-IdoA(2S) |
| Heparinase II | GlcNS/Ac(±6S)-IdoA(±2S) GlcNS/Ac(±6S)-GlcA |
| Heparinase III | GlcNS/Ac(±6S)-GlcA/IdoA (with a preference for GlcA) |
The lyases cleave heparin/HS by a beta elimination mechanism. This action generates an unsaturated double bond between C4 and C5 of the uronate residue.[32][33] The C4-C5 unsaturated uronate is termed ΔUA or UA. It is a sensitive UV chromophore (max absorption at 232 nm) and allows the rate of an enzyme digest to be followed as well as providing a convenient method for detecting the fragments produced by enzyme digestion.
Nitrous acid can be used to chemically de-polymerise heparin/HS. Nitrous acid can be used at pH 1.5 or at a higher pH of 4. Under both conditions nitrous acid effects deaminative cleavage of the chain.[34] At both 'high' (4) and 'low' (1.5) pH, deaminative cleavage occurs between GlcNS-GlcA and GlcNS-IdoA, all be it at a slower rate at the higher pH. The deamination reaction, and therefore chain cleavage, is regardless of O-sulfation carried by either monosaccharide unit.
At low pH, deaminative cleavage results in the release of inorganic SO4, and the conversion of GlcNS into anhydromannose (aMan). Low-pH nitrous acid treatment is an excellent method to distinguish N-sulfated polysaccharides such as heparin and HS from non N-sulfated polysacchrides such as chondroitin sulfate and dermatan sulfate, chondroitin sulfate and dermatan sulfate being un-susceptible to nitrous acid cleavage.
In addition to the bovine and porcine tissue from which pharmaceutical-grade heparin is commonly extracted, heparin has also been extracted and characterised from the following species:
The biological activity of heparin within species 6–11 is unclear and further supports the idea that the main physiological role of heparin is not anticoagulation. These species do not possess any blood coagulation system similar to that present within the species listed 1–5. The above list also demonstrates how heparin has been highly evolutionarily conserved with molecules of a similar structure being produced by a broad range of organisms belonging to many different phyla.
In December 2007, the U.S. Food and Drug Administration (FDA) recalled a shipment of heparin because of bacterial growth (Serratia marcescens) in several unopened syringes of this product. The bacterium Serratia marcescens can lead to life-threatening injuries and/or death.[52]
In March 2008, major recalls of heparin were announced by the FDA due to contamination of the raw heparin stock imported from China.[53][54] According to the FDA, the adulterated heparin killed 81 people in the United States. The adulterant was identified as an "over-sulphated" derivative of chondroitin sulfate, a popular shellfish-derived supplement often used for arthritis, which was intended to substitute for actual heparin in potency tests.[55]
In 2006, Petr Zelenka, a nurse in the Czech Republic, deliberately administered large doses to patients, killing 7, and attempting to kill 10 others.[56]
In 2007, a nurse at Cedars-Sinai Medical Center mistakenly gave actor Dennis Quaid's twelve-day-old twins a dose of heparin that was 1,000 times the recommended dose for infants.[57] The overdose allegedly arose because the labeling and design of the adult and infant versions of the product were similar. The Quaid family subsequently sued the manufacturer, Baxter Healthcare Corp.,[58][59] and settled with the hospital for $750,000.[60] Prior to the Quaid accident, six newborn babies at Methodist Hospital in Indianapolis, Indiana were given an overdose. Three of the babies died after the mistake.[61]
In July 2008, another set of twins born at Christus Spohn Hospital South, a hospital located in Corpus Christi, Texas, died after an accidentally administered overdose of the drug. The overdose was due to a mixing error at the hospital pharmacy and was unrelated to the product's packaging or labeling.[62] As of July 2008[update], the exact cause of the twins' death was under investigation.[63][64]
In March 2010, a two year old transplant patient from Texas was given a lethal dose of heparin at the University of Nebraska Medical Center. The exact circumstances surrounding her death are still under investigation.[65]
Contraindications: risk of bleeding (especially in patients with uncontrolled blood pressure, liver disease and stroke), severe liver disease, severe hypertension.
Side effects: hemorrhage, thrombocytopenia, increased potassium levels and osteoporosis.
Current clinical laboratory assays for heparin rely on an indirect measurement of the effect of the drug, rather than on a direct measure of its chemical presence. These include activated partial thromboplastin time (APTT) and anti-factor Xa activity. The specimen of choice is usually fresh, non-hemolyzed plasma from blood that has been anticoagulated with citrate, fluoride or oxalate.[66][67]
Considering the animal source of pharmaceutical heparin, the numbers of potential impurities are relatively large compared with a wholly synthetic therapeutic agent. The range of possible biological contaminants includes viruses, bacterial endotoxins, transmissible spongiform encephalopathy (TSE) agents, lipids, proteins and DNA. During the preparation of pharmaceutical-grade heparin from animal tissues, impurities such as solvents, heavy metals and extraneous cations can be introduced. However, the methods employed to minimize the occurrence and to identify and/or eliminate these contaminants are well established and listed in guidelines and pharmacopoeias. The major challenge in the analysis of heparin impurities is the detection and identification of structurally related impurities.The most prevalent impurity in heparin is dermatan sulfate (DS), also known as chondroitin sulfate B. The building block of DS is a disaccharide composed of 1,3-linked N-acetyl galactosamine (GalN) and a uronic acid residue, connected via 1,4 linkages to form the polymer. DS is composed of three possible uronic acid (GlcA, IdoA or IdoA2S) and four possible hexosamine (GalNAc, Gal- NAc4S, GalNAc6S or GalNAc4S6S) building blocks. The presence of iduronic acid in DS distinguishes it from chrondroitin sulfate A and C and likens it to heparin and HS . DS has a lower negative charge density overall compared to heparin. A common natural contaminant, DS is present at levels of 1–7% in heparin API, but has no proven biological activity that influences the anticoagulation effect of heparin.[68]
Marcum JA (January 2000). "The origin of the dispute over the discovery of heparin". Journal of the History of Medicine and Allied Sciences 55 (1): 37–66. doi:10.1093/jhmas/55.1.37. PMID 10734720. http://jhmas.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=10734720.
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