Structure Liver Kidney Illnesses That Occur Biology Essay


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The liver is the second largest gland in the body, weighing between 1 and 3 kg. It is located in the upper part of the abdominal cavity occupying the greater part of the right hypochondriac region, part of the epigastric region and extending in to the left hypochondriac region. Its upper and anterior surfaces are smooth and curved to fit the under surface of the diaphragm. Its posterior surfaces are irregular in out line. The liver is enclosed in a thin elastic capsule and incompletely covered by a layer of peritoneum. The liver consists of two anatomical lobes.

1. Right lobe

2. Left lobe.

The right lobe being about six times greater, then the size of the left lobe. The right lobe has quadrate lobe on its inferior surface and a caudate lobe on the posterior surface. The right and left lobes are separated anteriorly by a fold of peritoneum called the falciform ligament, inferiorly by the fissure for the ligament tares, and posterior by the fissure for the ligament venosum. The liver is special in that it can regrow its own tissue. As much as three-quarters of the liver can be removed, and the organ can grow back in about a month. Because of this regrowth, liver for transplant can be taken from living donors. (Ross and Wilson, 2006).


The hepatic artery and the portal vein supply the blood to the liver. Venous return is by a variable number of hepatic veins that leave the posterior surface and immediately enter the inferior vena cava just below the diaphragm. Liver lobules are hexagonal in outline and are formed by cubical shaped cells, the hepatocytes arranged in pairs of columns radiating from a central vein. Between two pairs of columns of cells are sinusoids (blood vessel with incomplete walls) containing a mixture of blood from the tiny branches of the portal vein and hepatic artery .This arrangement allows the arterial blood and portal venous blood to mix and come in to close contact with the liver cells. Amongst the cells lining the sinusoids are hepatic macrophages (kupffer cells) whose function is to ingest and destroy worm out blood cells and foreign particles present in the blood flowing through the liver.


The liver's job is to run over 500 bodily functions. It plays a role in the processing of metabolism and excretion of xenobiotics from the body. It also plays a key role in the body's defense system. It processes almost everything a person eats, breathes, or takes in through the skin. About 90% of the body's nutrients pass through the liver from the small and large intestines.

The liver changes food into energy stores this energy is used for the production of blood proteins. The livers also detoxify the bacteria and poisons from the blood. A baby's liver also makes blood cells in the womb. (Ross and Wilson, 2006)


The liver plays an important role in the breakdown of food in the body. Liver cells make bile, a greenish-yellow fluid that helps in the breakdown of fats and in bringing nutrients into the body. Waste made by the liver in the breakdown of food is carried in the bile and excrete from the body through the kidney. Someone with a liver that is not working properly those may have less bile production. They may not process the excretion of wastes as compared to a person with a healthy liver. When this happens, the body may have trouble in processing food and other chemical substances. Liver cells also convert heme (a portion of hemoglobin that is released when red blood cells are broken down) into Bilirubin. When the liver is damaged, Bilirubin may build up in the blood causing yellowing of the skin and whites of the eyes (jaundice).


The liver helps to provide the energy to the body by the process of metabolism. It controls the production, storage, and release of sugar, fats, and cholesterol. When food is taken, the liver changes glucose (blood sugar) into glycogen. The glycogen is then stored in the liver as an energy source for later use. The liver changes glycogen back into glucose when energy is needed at night. This process is called glucogenolysis. The liver controls the storage of fats by changing amino acids (the building blocks of protein) into fatty acids. Some fatty acids, such as triglycerides are changed by the liver into ketones. Ketones are fuel for muscles. Ketones are used when the body does not have enough sugar. The liver also makes processes and removes cholesterol from the body. Cholesterol is an important part of cell structures and certain hormones (Harsha Mohan, 2010).


Though the liver has a marked regenerative capacity and a large functional reserve Hepatic failure may develop from severe acute and fulminant liver injury with massive necrosis of liver cells (acute hepatic failure) or from advances chronic liver disease (chronic hepatic disease). Acute liver failure develops suddenly with severe impairment of the liver function where as chronic liver failure comes insidiously. Liver injury or liver dysfunction is a major health problem that challenges not only health care professionals but also pharmaceutical industry and drug regulatory agencies.


There are two types of the hepatic failure result from different causes.

Acute (fulminant) hepatic failure:

It happens mostly in severe viral hepatitis. Other causes are hepatotoxic drug reactions (Anesthetic agents, NSAIDS, Anti depressants), CCl4 poisoning, acute alcoholic hepatitis, mushroom poisoning, and pregnancy complicated with eclampsia.

Chronic hepatic failure:

It is the most common due to the cirrhosis. Other cause includes chronic active hepatitis, chronic cholestasis & Wilson disease.


The diverse functions performed by the liver, the disease of acute or chronic hepatic failure produces complex manifestations. The major manifestations are as follows.

(Harsha Mohan).


Hepatic encephalopathy (hepatic coma)

Hyperkinetic circulation

Hepato renal syndrome

Hepato pulmonary syndrome

Coagulation defects

Ascites and edema

Endocrine changes

Skin changes and

Foetor hepaticus.


Toxic liver injury produced by drugs and chemicals may virtually mimic any form of naturally occurring liver disease. Hepatotoxicity from drugs and chemicals is the commonest form of iatrogenic disease. Severity of the hepatotoxicity is greatly increased if the drug is continued after symptoms develop.

Among the various inorganic compounds producing hepatotoxicity are arsenic, phosphorus, copper and iron. The organic compounds include certain naturally occurring plant toxins such as pyrrolizidines alkaloids, mycotoxins and bacterial toxins. The synthetic group of the organic compounds is a large number of medicinal agents. In addition exposure to hepatic compounds may be occupational, environmental or domestic that could be accidental, homicidal or suicidal ingestion.

Drug reactions affecting the liver are divided in to two main classes.

Direct or predictable :

When the drug or one of its metabolite is either directly toxic to the liver it lowers the host immune defense mechanism. The adverse effects occur in most individuals who consume them and their hepatotoxicity is dose dependent.

Example: carbon tetrachloride

Indirect or unpredictable or idiosyncratic:

When the drug or one of its metabolites act as a hapten and induces hypersensitivity in the host. The hepatotoxicity by this group does not occur regularly in all the individuals and the effects are usually not dose related. (Harsha Mohan).

Example: Paracetanol.

Symptoms of hepatotoxicity



Abdominal pain

Loss of appetite


Yellow eyes

Enlarged liver, Etc…


The most widely prescribed therapeutic drugs have been focused attention on the hepatic safety of drugs. A significant number of drugs has been proven, or at least suggested, to cause hepatotoxicity. There are 900-1000 drugs and chemical substances are causing the liver toxicity throughout the world wide. It must be recognized that a drug is a chemical or biologic agent that has been found to cause a therapeutically action on a symptom or disease process, has been tested or identified for safety, and then if approved, is widely available for diagnostic purpose. There are many clinical diagnostic centers has given the manifestations, which specially suggest that a liver toxicity is the result of a therapeutic drug, with a dose dependent manner. The most important one is often the temporal relationship between initiation of a drug and the presence of the injury and of equal importance is the resolution of an abnormality following withdrawal. The attention has been given to the world population for the recognization of factors, which causing the harmful effects to the liver and who are increased the risk of developing hepatic damage from number of drugs and chemical compound (Willis C.Maddrey, MD 2005).


The spectrum of drug induced liver injury starting from initial, nonspecific significant changes in the biochemical parameters of no clinical consequences to acute hepatitis, chronic hepatitis, acute liver damage, chronic cholestatic disease and even cirrhosis and liver tumors.

Drugs withdrawn or severely limited because of hepatotoxicity.


There are relatively few ways by which acute and chronic liver diseases become clinically significant. The characteristics of drugs and chemicals induced liver disease are generally nonspecific and reflect more the extent of the liver injury than the cause. The signs and symptoms found in many hepatic diseases such as acute viral hepatitis, chronic viral hepatitis, or chronic cholestasis diseases.


Age, sex and the continuous use of other medications are important factors to consider in assessing an individual patient's susceptibility to drug induced liver disease. There are few agents, among them Valproic acid and erythromycin estolate, which predominantly cause adverse hepatic reactions in children. Valproic acid-induced liver toxicity is also more prevalent in patients who have inherited mitochondrial disorders. For most of drugs females are at an increased risk of developing an adverse hepatic reaction, when compared with that found in males.


Several mechanisms have been suggested that, most of the drugs and chemical compounds have been involved in producing drug induced liver toxicity. The chemical or drug which producing the liver toxicity is referred as the hepatotoxins. Some therapeutically important drugs are produced hepatotoxins and are readily identified as such in preclinical and clinical evaluations. With many drugs intermediary products produced during metabolism have been proved to be highly reactive and toxic. Potentially toxic metabolic products may be present only transiently and are rapidly metabolized further into harmless substances, thereby avoiding injury. The cytochrome P450s, a family of enzymes largely involved in initial oxidative (phase I) reactions of drug metabolism, has established roles in the production of highly reactive intermediates as well as established roles in further metabolism and accumulation. Identification and characterization of the various cytochrome P450 subspecies involved in metabolism of a drug allow predictions to be made regarding the likelihood of production of reactive intermediates and may focus assessment of the potential for drug-drug interactions, if two or more drugs are used in combination. For a growing number of drugs, there is evidence that genetic polymorphism in metabolic pathways are important in determining which individuals are likely to have an adverse reaction.



Paracetanol-induced hepatic injury is the most common form of drug-induced liver damage and more particularly of acute liver toxicity in the United States, accounting for nearly 50% of all cases. Paracetanol is likely the most widely used drug in the United States and is found in a remarkable number of prescribed and over-the-counter single and combination products, including cold remedies and medications for pain (Vicodin) with names that in no way indicate paracetamol is a component. Paracetanol is established dose-related hepatotoxins. In healthy individuals, there is apparently a considerable therapeutic range between harmless and harmful doses of paracetamol. In therapeutic doses (3 g/day), the drug is usually quite safe and well tolerated. Ingestion of excessive amounts of paracetamol (10-15 g), often in suicidal attempts, predictably leads to liver injury and occasionally death. The issues lie in assessing the risk of patients receiving paracetamol of 3 to 10 g/day, and whether there are settings in which liver injury is more likely to occur when the patient has not taken a large amount of the drug with a suicidal intent (so-called "therapeutic misadventures'') Hepatic injury from paracetamol is caused by the effects of a highly reactive metabolic product, N-acetylbenzoquinone-imide (NAPQI). Paracetanol is predominantly metabolized by conjugation reactions to form sulfate and glucuronide metabolites, which are excreted in the urine. A lesser amount of the drug is metabolized by cytochrome P450 2E1 to form N-acetylbenzoquinone-imide, Which is rapidly bound to intracellular glutathione and excreted in the urine as mercapturic acid, When excessive amounts of paracetamol are ingested, the ability to conjugate is overwhelmed and metabolism by cytochrome P450 2E1 becomes of much greater importance. In these situations, the capacity of glutathione to serve as an effective hepatoprotectant may be overwhelmed, and the hepatocyte becomes relatively defenseless against attack by the reactive intermediates. Two important factors determine the production of hepatic injury by paracetamol, the amount of N-acetylbenzoquinone-imide produced by P450 2E1 and the availability of glutathione as a hepatoprotectant. The intracellular concentration of NAPQI and dose of paracetamol ingested are clearly associated. However, there is more to the story than simply dosage. Factors that affect the production of cytochrome P450 2E1 and of glutathione are of importance. With chronic ingestion of alcohol, doses of paracetamol near or even with the suggested therapeutic range may lead to liver injury, promoted by an alcohol-induced decrease in intracellular glutathione and possibly an increase (actual or relative to GSH) of cytochrome P450 2E1. The end result is overproduction of NAPQ1 relative to the dispositional pathway of GSH leading to a heightened likelihood of liver damage. It must be noted that there continues to be controversy regarding the risk of paracetamol use in patients who drink alcohol. Many discussions have occurred at the U.S. Food and Drug Administration regarding labeling and the need for increased awareness of risks by the public. There is general agreement that an overdose of paracetamol is more likely to cause liver injury in a patient who is a chronic alcoholic. The debate is the definition of overdose and the amount of alcohol ingestion needed to predispose the patient to injury. N-acetylcysteine, now available in both oral and intravenous formulations, has proven effective when given early in the course of minimizing paracetamol-induced injury

Paracetamol hepatotoxicity.



The kidneys are the bean shaped paired organs, each weighing about 150 the adult male and about 1 the adult female. The hilum of the kidney is located at the midpoint on the medial aspect where the artery, vein, lymphatics and ureter are located. The kidney is surrounded by a thin fibrous capsule which is adherent at the hilum.

Cut surface of the kidney shows three main structures well demarcated

Peripheral cortex

Inner medulla

Inner most renal pelvis.

The renal cortex forms the outer rim of the kidney and is about 1cm in thickness. It contains all the glomerular and about 85% of the nephron tubules, remaining 15% nephrons consisting of collecting tubules, collecting ducts, loop of the henle and vasarecta send their loops in to the medulla, and are therefore called Juxtamedullary nephrons.

The renal medulla is composed of 8-18 cone shaped renal pyramids. The base of a renal pyramid lies adjacent to the outer cortex and forms the cortico-medullary junction; while the apex of each called the renal papilla contains the opening of each renal pyramid for passage of urine collected from collecting ducts and goes down in to minor calyces.The renal pelvis is the funnel shaped collection area of the urine for drainage in to the ureter.


In general the kidney performs the following vital functions in the body.

Excretion of waste products resulting from protein metabolism

Regulation of the acid-base balance by excretion of H+ ions (acidification) and bicarbonate ions.

Regulation of salt water balance by hormones secreted both intra and extra renally.

Formation of renin and erythropoietin and there by playing a role in the regulation of the blood pressure and erythropoietin respectively. (Ross and willson).


Diseases of the kidney are divided in to 4 major groups according to the predominant involvement of the corresponding morphologic components.

Glomerular diseases

Tubular diseases

Interstitial diseases

Vascular diseases


Renal failure is one of the major complications of myeloma, found at presentation in 20% of patients and occurring in 50% of patients during the cause of disease. Only 20% of the adults with a nephritic syndrome have minimal change nephropathy and for that reason a renal biopsy is necessary to establish the type of glomerulonephritis. Idiopathic glomerulonephritis accounts for 90% of childhood cases of nephritic syndrome and 80% in adult patients. In patients presenting with acute renal failure the proportion with acute interstitial nephritis varies from 6.5-1.5%. A recent year study (2000) from renal units and ICU in a defined geographical area of Scotland found that 131 patients per million per year required renal replacement therapy for acute renal failure.

The incidence of chronic kidney disease leading to dialysis varies worldwide: the number of patients per million population starting dialysis each year is 110 in the UK.

In acute renal failure causes untold suffering among patients leading to complications that sometimes lead to death It is estimated that in India, there are estimated 80, 000 people with severe renal failure. About fifteen percent of diabetics succumb to some renal complication or renal failure

In India, the Chandigarh study showed that 30 years ago diarroheal disease and obstetric complications each accounted for about 25% of cases of ARF in north India but more recently each has accounted for about 10%.

Intravascular haemolysis is a common feature of many cases, being found in over 20% of 325 patients receiving dialysis for ARF in Chandigarh. ARF develops in 5- 30% of the victims of severe snake viper poisoning and is the cause of between 2-3 % of cases of ARF. In Europe renal biopsy, performed for the indication of unexemplified acute renal impairment, shows interstitial nephritis (Harsha Mohan).

Water and sodium homeostasis and their disorders

Total body water accounts for about 60% of the body weight of a healthy adult: two third is intracellular and one- third is extracellular. The extracellular fluid compartment is divided into vascular (blood volume) and interstitial fluid compartments in the ratio 1:2 for a 75kg adult, the total volume of body water is approximately 45 liters, with intracellular and extracellular volumes of 30 and 15 liters respectively, the later comprising the blood (5 liters) and interstitial (10 liters) compartments. Sodium is the main intracellular cation, which with its anion chloride contributes 95 percent of the extracellular solute. By contrast the major intracellular cation is potassium. Many cell membranes are freely permeable to water, but not to most electrolyte, which results in the extracellular and intracellular compartments.

Body water and therefore solute concentrations are regulated mainly by vasopressin (ADH) mediated alteration of renal water excretion, but also to some extent by thirst as a motivation for drinking. The secretion of vasopressin and thirst are influenced principally by changes in circulating concentration of sodium, but also in past by significant falls in blood volume or pressure. The volume of extracellular compartments is determined by its total sodium content, which is regulated by numerous mechanisms. Sodium intake is poorly controlled in humans, although some animals do demonstrated a specific sodium appetite. The kidney is the major effector organ influencing sodium homeostasis.

Complex intrarenal mechanisms contribute to the maintenance of sodium homeostasis, in addition to which are endocrine factors that either tend to reduce excretion of sodium by the kidney for example renin-angitensin-aldosterone system or which produce a natriursis. Blood volume and pressure are also influenced by a variety of vasaoactive substances that act locally or systemically (ex: catecholamines, prostaglandins, nitric oxide, Endothelin). It can therefore be appreciated that there is an intricate network of homeostatic mechanisms controlling both sodium and water balance.

Disorders of water and salt homeostasis

Cranial diabetes insipidus

Nephrogenic diabetes insipidus.

Primary polydipsia.

Disorders of potassium homeostasis

Potassium is the most abundant cation in the body. Total body potassium ranges from 37 and 52mmol/kg body weight, and of this 98% is found in cells, where its concentration is in the range of 150-160 mmol/kg. The maintenance of intracellular and extracellular gradient is largely dependent on the ubiquitous Na+, K+ATP ASE enzyme which pumps potassium anions into the cell for every three sodium ions extruded.


Hyperkalaemia (Harsha Mohan)

Acute renal failure

It is defined as a significant decline in renal excretory function occurring over hours or days. This is usually detected clinically by arise in the plasma concentration of the urea or creatinine. Acute renal failure may arise as an isolated problem, but much more commonly occurs in the setting of circulatory disturbance associated with severe illness, trauma, or surgery; transient renal dysfunction.

Vascular causes of acute renal failure:

Acute cortical necrosis

Large vessel obstruction

Arterial obstruction

Venous obstruction.

Small vessel obstruction

Accelerated phase hypertension

Systemic necrosis

Glomerulonephritic and vasculitic causes of ARF

Interstitial nephritis.


Hanta virus disease. (Europe)

Chronic renal failure

It is the clinical syndrome of the metabolic and systemic consequences of a gradual, substantial and irreversible reduction in the excretory and homeostatic functions of the kidneys. It can be difficult to recognize because the symptoms and clinical manifestations are non- specific.

Causes of chronic renal failure

The most important causes of chronic kidney disease are diabetes, glomerulonephritis, hypertension and other vascular disease.

Arteriopathic renal disease and hypertension



Infective, obstructive and reflux nephropathies

Congenital disease

Familial or hereditary kidney disease, e.g. polycystic kidneys


Connective tissue diseases



Reflux nephropathy

Renal bone disease is a major cause of disability in patients with terminal renal failure (Arthur. C. Guyton).


Paracetamol induced kidney failure occurred as a result of severe hepatic failure. In the presence of severe hepatotoxicity that precludes further hepatic metabolism of the parent paracetamol, there may be spillover of paracetamol to the kidney where it will be metabolized. Nephrotoxicity then results when there is an insufficient glutathione in the renal parenchyma. This was initially interpreted as a hepatorenal syndrome. When paracetamol is metabolized in both liver and kidney, nephrotoxicity may occur independently of hepatotoxicity depending on the balance of metabolism and glutathione stores with bin the kidney. Biotransformation in the kidney of paracetamol to a reactive electrophile contributes to covalent binding and subsequent nephrotoxicity. As a cytochrome p-450 is the terminal oxygenase controlling most drug oxidation in the kidney, liver, and other tissues and because of this enzyme system is concentrated primarly in the renal cortex, it is likely that metabolic deactivation of paracetamol to an arylating metabolite might be responsible for the renal lesion just as it is for the hepatic injury. Compared to the liver, the cytochrome p-450 enzymes in the kidney are less able to detoxify paracetamol. Thus the renal glutathione stores are depleted more rapidly and kidney cell injury occurs as acute tubular necrosis.

In human life oxygen is very essential, without oxygen we cannot survive. Our evolutionary ancestors developed defense mechanisms that can minimize the toxic effects of oxygen, without this protection causes the end of life. Natural defenses are imperfect; the damage of the cells caused by oxygen can be minimized by using antioxidants. A lot of research works are made in this past decades. In this study the metabolites produced by the oxygen species and with research works they have learned how to prevent the diseases caused by the reactive oxygen species. Now research works are doing for improving the antioxidant activity (Lillian, 1995).

Free radicals of different forms are constantly generated for specific metabolic requirement and quenched by an efficient antioxidant network in the body. When the generation of these species exceeds the levels of antioxidant mechanism, it leads to oxidative damage of tissues and biomolecules, eventually leading to disease conditions, especially degenerative diseases. Many plant extracts and phytochemicals have been shown to have antioxidant/free radical scavenging properties and it has been established as one of the mechanisms of their action (Dubey et al., 2009).

Reactive oxygen species (ROS) such as O2ï‚·, H2O2 and OHï‚· are highly toxic to cells. Cellular antioxidant enzymes and the free radical scavengers normally protect a cell from toxic effects of the ROS. When generation of the ROS overtakes the antioxidant defense of the cells, oxidative damage of the cellular macromolecules (lipids, proteins and nucleic acid) occurs, leading finally to various pathological conditions (Bandyopadhyay et al., 1999).

Reactive nitrogen species (RNS) are the products of normal cellular metabolism. NO• is a small molecule that contains one unpaired electron on the antibonding (2π*y) orbital and is, therefore, a radical. NO• is generated in biological tissues by specific nitric oxide synthases (NOSs). Overproduction of reactive nitrogen species is called nitrosative stress. This may occur when the generation of reactive nitrogen species in a system exceeds the system's ability to neutralise and eliminate them. Nitrosative stress may lead to nitrosylation reactions that can alter the structure of proteins and so inhibit their normal function (Valko et al., 2006).


Free radicals are fundamental to any biochemical process and represent an essential part of aerobic life and our metabolism. They are continuously produced by body's normal usage of oxygen such as respiration and some cell mediated immune functions. The oxygen consumption inherent in cell growth leads to the generation of reactive oxygen species (ROS) (Gulcin et al., 2007).

Most harmful effects are produced by the reactive oxygen species (ROS) in our body, ROS are act as oxidants. Free radical is a chemical species which have a lone pair of electrons at its outer orbit, so it is unstable and more reactive. Examples are hydroxyl radical, nitric oxide radical, superoxide radical, lipid peroxyl radical and non radicals are hydrogen peroxide, singlet oxygen, hypochlorous acid and ozone.

General features of a free radical reaction

Free radical reactions take three distinct identifiable steps

Initiation step : Formation of radicals

Propagation step: It is the heart of a free radical reaction. In this step, the required free radical is regenerated repeatedly, which would take the reaction to complete.

Termination step: It involves the destruction of free radical intermediates (Manavalan and Ramasamy, 2001)

I. Initiation step

II. Propagation step

Rï‚· + O2 ï‚® RO2ï‚·

III. Termination step

Where HI and X are chain inhibitors.


Exogenous free radicals

Endogenous free radicals

Exogenous sources

Exogenous sources of free radicals are automobile exhaust fumes, UV radiation, electromagnetic radiation, cosmic radiation, interaction with chemicals, cigarette smoke, burning of organic matter during cooking, forest fires, volcanic activities, radioactive decay-,  and  radiation, lightening particularly oxides of nitrogen, byproduct of oxygen metabolism (Illness causes the body to produce greater amounts of harmful radicals than in healthy condition). Industrial effluents, excess chemicals, alcoholic intake, certain drugs, asbestos, certain pesticides and herbicides, some metal ions and fungal toxins inflict oxidative stress (Irshad and Chaudhuri, 2002).

Endogenous sources

These are internally generated sources of free radicals; they include cyclo oxygenation, lipooxygenation, lipid peroxidation, arachidonate pathways, peroxisomes, xanthine oxidase, inflammation, mitochondria, cytochrome-P450, phagocytes, reaction involving iron and other transition metals, neutrophils stimulated by exposure to microbes, re-perfusion of ischaemic organs ( Singh et al., 2004).

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