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13 Erythropoietin intheTreatment ofAnaemia
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13.4 Erythropoietin Production inCKD
Insufciently low EPO levels are associated with severe anaemia in patients with chronic kidney disease (CKD). CKD begins with an EPO deciency, but it seems to get worse when the estimated glomerular ltration rate (eGFR) is reduced below 30mL per minute per 1.73m2 (Wenger and Hoogewijs 2010). A reduction in EPO production or mistakes in EPO sensing may be the cause of an absolute EPO short­age. Reduced blood ow to the kidneys causes an imbalance in oxygen delivery, which is linked to chronic kidney disease (CKD). Renal tissue adapts as a result, consuming less oxygen and allowing the tissue oxygen gradient to remain normal. PHD enzymes continue to function as a result, and neither the HIF heterodimer nor the EPO gene is activated. Empirical evidence has shown the presence of cytokines such as transforming growth factor-beta (TGF-β), interleukin-lβ (IL-lβ), IL-la, and tumour necrosis factor (TNF)-α decrease the generation of EPO caused by hypoxia (Fandrey and Jelmann 1991). The immunological activation molecule hypoxia­induced EPO is suppressed, and it is well known that CKD causes an increase in inammation (Rao etal. 2007; Souma etal. 2016).
13.5 Role ofErythropoietin inCKD-Related Anaemia
EPO has the capacity to stimulate the differentiation and proliferation of bone mar­row cells. It serves as a humoral factor that facilitates the generation of RBCs. Furthermore, EPO has the ability to enhance the production of haemoglobin, increase blood circulation in peripheral arteries, and encourage the process by which stem cells may develop into RBCs. To facilitate the transformation of the red line into fully developed RBCs, the hormone EPO activates EPO receptors, which in turn promote the differentiation and proliferation of burst-forming unit-erythroid (BFU-E) cells. This chapter basically highlights the role of erythropoietin agents in the treatment of anaemia in CKD patients along with patients with diabetic anae­mia, CHF anaemia, and inammatory bowel disease anaemia (Batchelor etal. 2020).
13.6 Types ofVarious Erythropoietin Stimulating Agent Use
inCKD Anaemia
The clinical management of CKD-induced anaemia has been signicantly improved with the introduction of the rst human recombinant EPO, especially for dialysis patients. ESA therapy accounted for 11% of all Medicare ESRD costs in 2004 and was the greatest single Medicare drug expenditure in the USA, with a total of US$1.8 billion. There are three generations of EPO agents: rst genera­tion, second generation, and third generation. The rst-generation EPO agents have a shorter half-life and require frequent dosing. Hence, second-generation EPOs are modied with a higher short life to reduce the frequent dose timing.
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Table 13.1 Various erythropoietin agents' generation for clinical use in CKD anaemia
Manufacturing company Agent name Generation Marketing agency
Ortho biotech Epoetin alfa (Procrit) First US Amgen Epoetin alfa (Epogen) First US Janssen-Ortho Epoetin alfa (Eprex) First Worldwide except US Roche Epoetin beta (NeoRecormon) First Europe Amgen Darbepoetin (Aranesp) Second North America, Europe,
Roche Erythropoietin receptor
activator
Third US
Canada
N. Ghosh et al.
Recently, third- generation EPO agents have been modied into ESA agents for a better therapeutic effect, and it is also known as EPO receptor activators (Eschbach etal. 1989; Macdougall 2008). There are several EPO agents that are available in the market (Table13.1).
13.7 Role ofErythropoietin withCombination Drug
Therapy inCKD Anaemia
13.7.1 Iron Sucrose
Clinically, there are two main categories for administering iron supplements: oral and intravenous. Oral delivery is often insufcient to fully full the iron needs in the bone marrow of individuals with uraemia and diseases related to iron release and absorption in the gastrointestinal tract. On the other hand, intravenous iron supple­mentation has a relatively high utilisation rate and few gastrointestinal side effects (Van Wyck etal. 2005). This can boost iron reserves and enhance iron use, helping to get beyond the reticuloendothelial system’s iron release barrier. In the reticuloen­dothelial system, active macrophages help release iron ions from intravenous iron complexes. Iron utilisation in the body increases when a portion of the iron com­bines with apoferritin to produce serum ferritin reserves inside cells and when another portion of the iron connects with transferrin-to-transferrin receptors located on the surface of juvenile red blood cells. Clinical observation has demonstrated that starting with EPO treatment and gradually increasing the iron sucrose treatment can both signicantly improve clinical efcacy and improve symptomatic treatment by mitigating the adverse reaction to low and mild levels of the sugar iron treatment (Xue etal. 2015).
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13.7.2 L-Carnitine
L-carnitine is an amino acid that is widely distributed throughout the tissues of the body. The compound has the potential to impact the acylation and phospholipid processes as well as the deformability of the erythrocyte membrane. Additionally, it can stabilise the membrane of RBCs and increase the number of red blood cells in order to improve the body’s ability to withstand different types of pressures. A shortage of L-carnitine at the cell level can have harmful effects, shorten life expec­tancy, raise normal red cell osmotic fragility, and perhaps lead to EPO resistance. In patients who are in remission, L-carnitine has been shown to reduce micro­inammation, tumour necrosis factor (TNF), interleukin 1 (IL-1), and C-reactive protein (CRP), effectively decreasing renal anaemia (Boran etal. 1996; Emami Naini etal. 2012).
13.7.3 Iron Dextran
An intravenous iron preparation is known as iron dextran. Patients with anaemia who get erythropoietin treatment have imbalanced iron storage and excessive iron consumption. IV iron supplementation has good efcacy, yet there is a risk of both acute adverse reactions and delayed reactions that resemble allergic reactions. These reactions include hypotension, urticaria, chest discomfort, respiratory issues, and vasogenic oedema. When iron dextran dispersion tablets are used in conjunc­tion with erythropoietin and L-carnitine injection, the effectiveness of EPO is greatly increased. As a consequence, there is a drop in EPO levels, a notable enhancement in the condition of anaemia, a reduction in adverse effects, and a decrease in dialysis syndrome (Larramendi etal. 2006).
13.7.4 Reduced Glutathione
Persons with chronic renal failure have decreased antioxidant activity, increased oxidant activity, and a buildup of metabolic products, leading to reduced levels of glutathione and increasing amounts of oxidised glutathione. Disulde linkages are created by molecules in the membrane of red blood cells, resulting in the aggrega­tion of macromolecules on the membrane and causing deformation of the RBCs. The three-peptide complex glutathione is made up of glycine, cysteine, and glu­tamic acid. It serves as a signicant metabolic regulator inside the cell. It may
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provide cysteine and thiol while preserving the cell’s normal metabolic and physi­ological processes, hence preserving the integrity of the cell membrane (Zachara etal. 2006). Furthermore, it may eliminate lipid peroxide by interacting with pro­electron or reactive-oxygen species, protecting the cell. Exogenous reductive gluta­thione treatment for chronic renal failure has many potential benets, including stabilising the membrane of red blood cells, increasing their longevity, decreasing levels of oxidised glutathione, and improving red blood cell reduction. Supplemental reductive glutathione, as opposed to EPO alone, has profound effects on anaemia, according to studies (Ghorbani etal. 2016).
N. Ghosh et al.
13.7.5 Irbesartan andEnalapril
Patients with various forms of renal anaemia and hypertension suffer from chronic renal insufciency. Angiotensin-converting enzyme can be inhibited with enalapril, which hydrolyses into enalapril and lowers the amount of angio­tensin II (AT-II), alleviating hypertension by relaxing blood arteries and decreas­ing blood pressure. Irbesartan, an AT- II receptor blocker, inhibits the vascular angiotensin-converting enzyme (ACE) 1 receptor, thereby preventing the con­version of vascular angiotensin I to angiotensin II (Peters etal. 2015). It lowers blood pressure by directly inhibiting the binding of ACE-1 receptors and angio­tensin II, resulting in reduced constriction of blood vessels and decreased release of aldosterone. Patients undergoing haemodialysis for chronic renal illness who are treated with enalapril and irbesartan have higher haemoglobin and red blood cell counts, although these increases were not as great as those shown in the group that only used EPO once. To guarantee that enalapril is successful, hyper­tensive individuals with chronic renal function disorders need to be adminis­tered the proper dose of erythropoietin (Ordaz- Medina etal. 2010).
13.7.6 Vitamin C
Vitamin C (ascorbic acid) is uptaken by the body via the upper section of the small intestine after dissolving in water. For reducing metabolic oxidative stress, vitamin C is absolutely essential. Vitamin C has a crucial role in the production of collagen, the prevention of scurvy, maintaining gum and dental health, pre­venting muscle wasting, inhibiting artery hardening, synthesising antioxidants, and treating anaemia. Iron consumption in the liver is enhanced by vitamin C, which also lowers ferric iron and increases intestinal iron absorption. Lack of vitamin C lowers dialysis clearance in certain haemodialysis patients (Eiselt etal. 2001).
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13.8 Route ofAdministration
When providing ESA to patients with CKD, the administration route should be considered. Research indicates that the subcutaneous approach is generally more economical than the intravenous approach, requires fewer injections overall, and minimises the need for extra support after injections. Despite this, since ESA may be comfortably given during dialysis, a lot of dialysis patients and possibly nephrol­ogy professionals choose the intravenous method. For example, most dialysis patients in the USA take ESA therapy intravenously. However, the option is restricted to subcutaneous administration in peritoneal dialysis patients and in the non-dialysis CKD population since patients are frequently told to use the least intru­sive, subcutaneous, mode of injection at home without supervision. If a patient still fails to respond well to intravenous ESA administration after their dose is adjusted, they may consider switching to the subcutaneous method. The subcutaneous dose should be lowered by 30% when considering this move to prevent the chance of an abrupt increase in haemoglobin levels above target (Tonelli etal. 2003).
13.9 Risk Ratio ofTreatment withESA
Agent-Related Hypertension
About 5% of individuals may experience an increase in hypertension after using an ESA, necessitating a change in dosage or another ESA.Seldom does complete ESA withdrawal become essential in the age of innovative and potent antihypertensive therapy. It is believed that the mechanism of ESA-induced hypertension involves ESA stimulating the vascular endothelium, which raises endothelin levels in the blood. Furthermore, vasospasm may develop from an increase in blood viscosity brought on by the haemoglobin increase linked to ESA medication. Thus, it is essential that patients getting ESA medication have their blood pressure checked on a regular basis (Public Health Advisory; Information for Healthcare Professionals) (Krapf and Hulter 2009).
13.10 Role ofErythropoietin Agent inCHF Patient
withAnaemia
With almost half a million new cases each year, congestive heart failure (CHF) is a fast-expanding public health issue that affects approximately ve million people in the USA alone. Seniors have the highest prevalence of CHF; ten out of every 1000 people over 65 have the condition. One modiable concomitant condition of heart
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failure has been identied as anaemia. Based on the World Health Organization’s (WHO) denition of anaemia, which is dened as haemoglobin <13g/dL in men and<12g/dL in women, it has been estimated that up to 55% of CHF patients had anaemia overall, and up to 79% of patients with advanced, New York Heart Association (NYHA) class IV CHF (Silverberg et al. 2008). Anaemia has been related to adverse outcomes such as left ventricular dilatation and hypertrophy, as well as an increase in heart failure. Renal insufciency is a typical occurrence in people with CHF; up to 50% of patients have renal impairment. As renal failure progresses, circulating erythropoietin levels drop, which in turn lowers haemoglo­bin levels and bone marrow erythrocyte synthesis. The EPO gene has been assigned a specic location on human chromosome 7, namely at position 7q21. The thera­peutic use of recombinant EPO was rst introduced in 1987 for patients suffering from anaemia caused by chronic renal insufciency (Anand 2008).
N. Ghosh et al.
13.11 Anaemia inPatients withCongestive Heart Failure
CHF-associated anaemia, despite being quite prevalent and having negative impli­cations, may not receive sufcient recognition. About 22% of patients in the extensive Studies of Left Ventricular Dysfunction (SOLVD) experiment were diagnosed with anaemia. The severity of anaemia was directly linked to higher mortality rates. Lower haemoglobin levels were associated with a higher risk of mortality or hospitalisation for people with chronic heart failure, according to the ndings of a different study named Outcome of Prospective Trial of Intravenous Milrinone for Exacerbations of Chronic Heart Failure (OPTIME-CHF). Specically, for every 1g/dL decrease in haemoglobin, there was a 12% increased risk (Silverberg etal. 2006). There are numerous factors that can produce anaemia linked with CHF.CHF is a persistent inammatory condition characterised by signicant increases in cytokines, including interleukins and TNF-α. The pres­ence of these inammatory cytokines hinders the generation and effectiveness of EPO.Additionally, they have the potential to impede the release of iron from tis­sue reserves. In addition, the enlargement of the heart and the associated kidney dysfunction might lead to a dilution of the blood. Anaemia in congestive heart failure can potentially be caused by the pharmacological medications adminis­tered for the treatment of heart failure. Angiotensin receptor blockers (ARBs) and angiotensin-converting enzyme (ACE) inhibitors are the backbone of contempo­rary treatment. These drugs can disrupt the production of red blood cells either by directly suppressing bone marrow activity or by reducing the effectiveness of the erythropoietin receptor. The administration of ACE inhibitors or ARBs in indi­viduals with hypertension may lead to a reduction in haemoglobin levels of up to
0.3mg/dL. Additional possible factors that can contribute to the condition are prolonged aspirin use leading to blood loss in the gastrointestinal system and bowel oedema causing reduced absorption of iron and other nutrients (Groenveld et al. 2008a). Furthermore, the reduced synthesis of EPO that occurs in
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conjunction with chronic renal illness can potentially be a contributing factor to the development of anaemia. On the other hand, having a high level of creatinine in the blood is a signicant and separate factor that increases the risk of death in individuals with heart failure. Uraemia is linked to a higher accumulation of ath­erosclerotic plaque and, as a result, a greater occurrence of coronary lesions and events. The main cause of death for individuals with end-stage renal disease (ESRD) is cardiovascular events. Anaemia is made worse by chronic kidney dis­ease (CKD), which increases the chance of heart failure (Nemeth 2008).
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13.12 Growth Factor’s Role inTreating
CHF-Linked Anaemia
The implementation of EPO has had a substantial inuence on the treatment of anaemia. Initially, EPO was employed for the treatment of anaemia in individuals with ESRD.Afterwards, the focus has turned towards its utilisation in anaemia due to congestive heart failure (National Kidney Foundation 2006). The implementation of neuro-hormonal inhibition in current therapy for CHF has led to substantial reductions in both morbidity and death. Nevertheless, addressing anaemia linked with CHF may result in further advantages. Echocardiograms in anaemic patients with chronic renal insufciency who received EPO treatment showed a reduction in left ventricular (LV) mass and a decrease in LV dilatation. An experiment conducted by Silverberg etal. (2002) examined anaemic patients with advanced CHF who were treated with EPO and intravenous (IV) iron (Silverberg etal. 2002). The study found that an increase in haemoglobin (Hb) levels was linked to improvements in left ventricular ejection function (LVEF), a reduction in functional class, and a decrease in the frequency of hospitalisations. In a separate trial conducted by Mancini etal. (2003), anaemia was treated by administering EPO and oral ferrous gluconate (Mancini et al. 2003). This treatment resulted in improved exercise parameters, as seen by an elevation in peak oxygen consumption levels (VO2). In addition to its ability to improve anaemia, EPO also provides other benets that are not related to the production of red blood cells. It reduces the occurrence of pro­grammed cell death in cardiac muscle cells. Recruiting endothelial progenitor cells improves the formation of new blood vessels, known as angiogenesis, and conse­quently promotes neovascularisation (Groenveld etal. 2008b). Patients with CHF may experience positive effects from the latter option due to the amelioration of ischaemia associated with coronary and cerebrovascular atherosclerosis. Because it may lower levels of cytokines and interleukins, EPO may have an anti-inammatory effect. Hence, EPO may prevent myocardial infarction (MI) damage from progress­ing any further. The retina and other brain tissues have also shown evidence of EPO receptors. Animal studies have shown that EPO may help prevent kidney and central nervous system (CNS) damage caused by acute ischaemia. Comparable results have been observed in patients treated with darbepoetin for both anaemia and CHF.The
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N. Ghosh et al.
preliminary results of a randomised, double-blind experiment that was carried out across several sites suggested that darbepoetin alfa raised haemoglobin levels, which improved quality of life (Tanner etal. 2002).
13.13 Conclusions
ESA treatment is recommended for anaemia in individuals with CKD to enhance the quality of life and reduce morbidity and death. Several concerns highlighted in this article must be considered while administering ESA for the treatment of anae­mia in CKD. Moreover, as growing data indicate ESA medication may not be entirely harmless, it is crucial to strictly follow instructions and maintain haemoglo­bin levels within the suggested target ranges. Regularly monitoring the patient is necessary to enhance overall outcomes. Despite the use of appropriate pharmaceuti­cal management, CHF remains a signicant public health issue. Anaemia associated with CHF is a signicant coexisting condition that, when addressed, might poten­tially reduce the chances of heart failure. The administration of growth factors has been linked to increased levels of haemoglobin, which in turn has been related to better outcomes in patients with advanced heart failure. Effective identication and treatment of this disease may require the cooperation of primary care physicians, nephrologists, and cardiologists. We need further research on the impact of growth factors on mortality and morbidity, the cost-efciency of darbepoetin and EPO, and other topics. This should be done through larger studies that are randomised, double­blind, and placebo-controlled. Furthermore, the ideal goal levels for Hb have not been determined.
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