Ouabain: a gift from paradise
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About this ebook
Also in current research qualities of ouabain are fiercely disputed. Like in the past, the dispute again is dominated by hubris and personal vanity. A group of scientists is convinced that ouabain is an endogenous hormone. It is asserted that ouabain not only is a key factor in the pathogenesis of hypertension and heart failure but has significant implications in the pathogenesis of many common diseases.
Hauke Fürstenwerth describes the rise and fall of Ouabain. He presents an objective, fact-based analysis of the true history of Ouabain. With previously unreported facts, he describes the eventful history of this drug. The story of Ouabain is not finished yet. Current research results allow a new interpretation of the many years of therapeutic experience. Ouabain has an untapped therapeutic potential. The book documents how Ouabain can be reapproved for the benefit of patients.
The history of Ouabain is integrated into the development of pharmacy and medicine. Today, the statistical risk for a probable disease has been established as an independent clinical indication. Even patients without symptoms are treated with drugs. Standard values for blood pressure, cholesterol and blood sugar define disease. This change is also part of the unfinished Ouabain story.
Hauke Fürstenwerth
Hauke Fürstenwerth holds a PhD in natural sciences. He worked for more than two decades in the pharmaceutical and biotech industry. Since 2001 he is consultant for technology companies and their investors. Hauke Fürstenwerth has many years of management experience in the development of new products. He has published several scientific articles on Ouabain and is the author of numerous publications on innovation and venture capital.
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Reviews for Ouabain
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- Rating: 5 out of 5 stars5/5This book gives a comprehensive history of the clinical use both successes and failures (why there were failures) of Strophanthus Ouabain as well as its fall out of favor among mainstream practitioners over the decades. I am a lay person so I did not fully comprehend all the medical technical terminology but I had a desire to understand the outline of why this drug can be useful in the treatment of many common chronic diseases, especially heart disease and asthma. My take away is that is has a powerful affect on the parasympathetic nervous system in the correct dose allowing more efficient cell function. I do hope the author is able to secure the funding for his endeavor to satisfy requirements to meet FDA approval for getting this drug back on the market. Even though the author has this intention, I appreciated the way he reported his investigation of history in an unbiased manner. My interest in this treatment is due to the work of Dr. Tom Cowen.
Book preview
Ouabain - Hauke Fürstenwerth
properties.
From arrow poison to medicine
The Strophanthus and Acokanthera species, which are native to Africa and parts of Asia, contain cardiac glycosides that are structurally similar to those of the Digitalis species. The glycosides serve the plants as a defense against predators. Humans and animals have also taken advantage of the toxicity of these plants. The African crested rat (Lophiomys imhausi) uses it for an extraordinary defense strategy. It chews the bark of highly toxic acokanthera shrubs, which contain the cardio-active glycoside g-Strophanthin (ouabain), and then applies the toxic saliva to the hair of its prominent crest. The sponge-like structure of the hair secures the saturation of the coat with poison loaded saliva by capillary forces. Dogs that attack the crested rat and come into contact with the poisonous coat show severe poisoning symptoms that can lead to death [Kingdon 2012]. Rats themselves are much less sensitive to steroid glycosides than other species. That's why the Acokanthera poison has no effect on them.
Many tribes in Africa have used preparations of Strophanthus and Acokanthera plants as arrow poisons. These were used both on the hunt for wild animals and in acts of war. Even large animals like elephants could be killed with the highly poisonous arrows. Poison arrows were important weapons in the arsenal of the African population in resisting invaders, slave hunters and colonial masters. In the British colonies the natives were forbidden to produce and possess arrow poisons and were threatened with drastic punishments. Even the cultivation of Strophanthus plants and the collection of Strophanthus seeds was punishable [Osseo-Asare 2014]. The recipes for the preparation of the poison mixtures were passed on as secret recipes only within the own tribe. Outsiders were not told which parts of the plant had to be harvested at what time and how they had to be processed and often enriched with other ingredients such as snake or scorpion poison.
African healers knew the medical value of Strophanthus plants very early on. Alcoholic extracts were produced by soaking the plant roots with subsequent fermentation. The bitter-tasting solutions were administered in small sips over a period of days or weeks. To avoid poisoning, the amount administered was carefully dosed by the healer. Muscle pain, open wounds, constipation, food poisoning, sexual diseases and heart disease were treated [Osseo-Asare 2014]. To the locals, Strophanthus was poison and remedy in one. In the mythology of the Wilé tribe in Upper Volta, this plant was sent from paradise to earth to heal or punish people according to their merit [Leuenberger 1972].
In the report of his expedition to Mozambique, during which he explored the Zambezi tributaries from 1857 to 1863, the Scottish missionary David Livingstone describes a poison that was used by the local warriors in the Shire highlands on Lake Najasasee to kill people and referred to as kombé. If you touch a tiny piece of this poison with your tongue, it is paralyzed.
Livingstone was accompanied on his expedition by the botanist John Kirk. His task was to look for plants that seemed suitable and profitable for commercial products. Kirk reports that a single poisoned arrow was enough to kill a buffalo, but the hunters often had to stay on the wounded animal's heels for half a day before the deadly effect occurred. Kirk kept some examples of the kombé poison arrows in a bag, in which he also kept his toothbrush. When he used it one morning in March 1859, he noticed a bitter taste. Kirk's pulse was elevated due to a feverish cold, but decreased significantly after using the toothbrush. Kirk attributed this rapid effect to a contamination of his toothbrush with the kombé poison. Kirk sent samples of the poison and parts of the plant from which the kombé poison was prepared to the Royal Botanical Institute in London (Kew Gardens). There the plant was first identified as Strophanthus hispidus, later correctly as Strophanthus kombé.
Several researchers have rendered outstanding services in the clarification of the active substance contained in Strophanthus kombé and its pharmacological properties. Thomas Richard Fraser (1841 - 1922) - who taught pharmacognosy, pharmacy, pharmacology and therapy at the same time in Edinburgh - dealt most intensively with the kombé poison. He succeeded in isolating the pure active ingredient and characterised it as a glycoside. He was also able to show that the Strophanthus active ingredient has a pronounced cardiac effect and is suitable for therapy in humans. In 1885 Fraser reported on his first experiences with a Strophanthus tincture in patients and recommended its use in all forms of cardiac fatigue and as a diuretic. Fraser's work today is regarded as the basis for the application of Strophanthin to humans.
At the end of the 19th century, Digitalis preparations were a controversial remedy with limited acceptance by doctors due to their uncertain effects and their dreaded toxicity. Fraser's work nurtured the hope that Strophanthus glycosides might be a suitable replacement for Digitalis preparations. The Strophanthus research that began after 1885 was correspondingly intensive. As early as 1890, the number of scientific publications totalled more than one hundred. Intensive research has also been carried out in France and Germany on Strophanthus active ingredients.
French researchers in particular differentiated between ingredients from different Strophanthus species. Catillon won in 1888 pure substances from the Strophanthus species gratus, hispidus, niger and kombé. He regularly received crystalline products only from Strophanthus gratus, while the others, especially Strophanthus kombé, only supplied amorphous products. At the same time Arnaud was concerned with an arrow poison that the Somalis extracted from the wood of a tree called Acokanthera ouabaio. In 1888 he succeeded in isolating a crystalline active substance, which he called ouabain. Only a short time later, he found an identical active ingredient in an arrow poison made from Strophanthus gratus. The name g-Strophanthin for the Strophanthus gratus glycoside was introduced by Thoms in 1904 to distinguish it from the active ingredients of other Strophanthus species [Gilg 1904]. The glycoside found in the Strophanthus kombé investigated by Fraser was henceforth referred to as k-Strophanthin. Ouabain, which is identical to g-Strophanthin, largely replaced k-Strophanthin preparations in the therapy of heart patients in France after the First World War as Ouabain Arnaud
. In Germany, clinical Strophanthus research only began at the beginning of the 20th century with a publication by Schedel. He refers to Fraser, because after his publication in 1885, a veritable flood of publications appeared on this new cardiac drug, a sign that the use of digitalis does not meet all requirements.
In his work published in 1904 Schedel reports on positive experiences with a Strophanthus gratus tincture containing g-Strophanthin (ouabain). He emphasizes the beneficial effects on respiratory distress (dyspnoea) and pulse in heart patients also observed by other clinicians [Schedel 1904].
~ ~ ~
When Fraser published his groundbreaking work on the effects of Strophanthus' active ingredients in 1885, drugs were usually produced in doctors' pharmacies and home pharmacies. But also herbalists, pedlars and quacks were allowed to sell products declared as remedies. There was practically no regulation and control of the production, quality and efficacy of drugs. The purity and efficacy of drugs depended on the skill and experience of the individual pharmacist. Most pharmacists were still familiar with the use of native medicinal plants such as Foxglove species. However, every pharmacist used recipes he had developed himself to manufacture his products. In order to ensure a minimum quality of medicines, official pharmacopoeias were already being compiled in many countries in the 18th century, listing drugs known to be effective and methods for their production and storage. The first German pharmacopoeia (DAB1) was published in 1872 and the Pharmacopoea Austriaca was valid in Austria from 1812. The United States Pharmacopeia has existed in America since 1820.
Dealing with tropical plants posed new challenges for pharmacists and doctors. There was no experience with the identification of plants and suitable plant parts (leaves, seeds) and methods of preparing suitable dosage forms. The chemical analysis was not yet at a level that would have enabled an exact determination of the active ingredient content of plants and extracts. Empirical testing was the rule, extreme quality differences of supposedly identical products the inevitable result.
The period at the end of the 19th century was a period of political and economic upheaval. Progress in many scientific disciplines has led to the scientificisation of therapeutic measures in medicine. Empiricism and tradition were replaced by science. Industrial companies based on research were founded. Companies such as Hoechst, Bayer, BASF, Sandoz, Ciba, E. R. Squibb and Sons (now Bristol-Myers Squibb) and Boehringer were all founded in the second half of the 19th century. They were all looking for attractive products. The production of medicines was a promising business field.
In 1851 Ernst Christian Friedrich Schering (1824-1889) founded a pharmacy in Berlin, which in 1864 became the Chemische Fabrik Ernst Schering, which boasted of offering pure preparations. The later gave rise to Schering AG, which today is part of the Bayer Group. The pharmacist Heinrich Emanuel Merck (1794 - 1855) had already started in 1827 selling isolated active ingredients from plants such as caffeine, cocaine, morphine and nicotine to other pharmacists, chemists and doctors. These activities were the cornerstone of the pharmaceutical and chemical company E. Merck Darmstadt. Merck's product range focused on active ingredients derived from tropical plants. Hoping for more valuable plants was the reason why botanists like John Kirk always participated in expeditions like the one from Livingstone to Mozambique. Their task was to look specifically for such plants.
The American Henry Wellcome (1853-1936) had a great personal interest in new developments in medicine, pharmacology and botany. He was convinced of the great potential of tropical plants for new drugs. In the 1870s he had been on the road in South America in search of plants containing quinine. In 1880, together with his partner Silas Burroughs, he founded the company Burroughs, Wellcome & Co in London. The young company was looking for new products. When Fraser reported on his therapeutic experiences with homemade Strophanthus tinctures at the annual meeting of the British Medical Association in Cardiff in 1885, Henry Wellcome was also present. After an intensive discussion with Fraser, Wellcome decided to include the Strophanthus product in the product portfolio of his young company. Fraser supported Burroughs, Wellcome & Co with his knowledge of selecting suitable Strophanthus seeds and producing a tincture suitable for therapeutic use. Already in 1886 the new product Tincture of Strophanthus was on sale, which was sold at seven shillings per ounce in England and America. From 1887 the tincture was also marketed in Germany, Holland and other countries. The tincture was recommended in adults for the treatment of heart murmurs, nervous asthma, typhoid fever and pneumonia. With sweet syrup to mask the bitter taste it was also given to children.
Initially, it proved difficult to obtain sufficient quantities of suitable Strophanthus seeds for the industrial production of Strophanthus tinctures. Only the seeds of Strophanthus kombé were suitable for the production of the tincture developed by Fraser. However, seeds of unsuitable Strophanthus species were often delivered. With the help of John Buchanan, the British Consul of Malawi, Wellcome built a reliable supply chain [Hokkanen 2012]. In 1906, 16 tons of Strophanthus seeds worth 8,000 British pounds were exported from the British Protectorate in Central Africa to England. The seeds were harvested from wild plants. Cultivating the plants did not seem attractive enough. Other companies also began to market Strophanthus products. Some of these were of dubious quality. To distance himself from these, Wellcome advertised that its tincture corresponded to the original recipe of Fraser and was tested by him. Burroughs Wellcome made extensive use of medical and scientific literature in his advertising - especially Fraser's articles. From the beginning of 1886, reprints of Fraser's publications in The Lancet and British Medical Journal were used to promote the Tincture of Strophanthus. The authority of science is still used today by all pharmaceutical companies as an essential part of the marketing strategy for drugs. The Tincture of Strophanthus was a commercial success and founded the rapid growth of Burroughs, Wellcome & Co in the late 19th century.
Initially, no reliable information was available on suitable medical indications for the Strophanthus tincture. Fraser had described the diuretic effect, rapid onset of action and positive effects on edema and respiratory distress in a few patients. Fraser stressed in particular that strophanthin increases the action of the heart without raising blood pressure.
Further clinical and pharmacological investigations were necessary. As Burroughs Wellcome did not yet have its own laboratories, it made its tincture available to doctors and hospitals at home and abroad free of charge for experimental purposes. In 1894 the Wellcome Physiological Research Laboratories were founded, one of the first commercial research laboratories of their time.
In 1930 Burroughs Wellcome began selling digoxin preparations containing pure digoxin isolated from Digitalis lanata that very quickly became a great commercial success.
In America, E. R. Squibb and Sons was one of the first suppliers of Strophanthus products. Particularly popular was a chocolate-coated tablet of a mixture of Digitalis and Strophanthus extracts, which was sold at 16 cents per hundred pieces. The recommended dose for palpitations, smoking heart and as a heart tonic was one tablet every three to four hours. In Germany, Strophanthus preparations were developed by Boehringer Mannheim and E. Merck. In the absence of suitable research departments, these companies also made samples of pure Strophanthus extracts available to interested physicians and scientists for scientific investigations.
Info-Box Heart Glycosides
The drugs known as heart-active glycosides are also known as cardiac glycosides or steroid glycosides. The representatives of this class of chemical agents are found in numerous plant species. In addition to Foxglove species (Digitalis), these include Adonis rose (Adonis), Lily of the Valley (Convallaria majalis), Oleander (Nerium oleander) and the African lianas of the Strophanthus species and the African tree Acokanthera ouabaio. Approximately 200 active ingredients of this class are known. Of medical significance are the Digitalis derivatives digitoxin (from Digitalis purpurea), digoxin (from Digitalis lanata) and the Strophanthus derivatives k-Strophanthin (from Strophanthus kombé) and g-Strophanthin (from Strophanthus gratus), which is identical to the ouabain isolated from Acokanthera ouabaio. Chemically, the steroid glycosides are all constructed according to the same principle: a steroid framework similar to that of sexual hormones and bile acids is connected to a sugar chain consisting of one or more sugar residues. The steroid glycosides differ from each other by different sugar chains and different substituents on the steroid framework. The steroid skeleton is called aglycon or genin.
Digitoxose - Digitoxose - Digitoxose – Digitoxigenin
The Digitoxin contained in the Red Foxglove consists of the aglycon digitoxigenin and a sugar chain consisting of three units of digitoxose. The sugar chain of digoxin contained in Digitalis lanata also consists of three digitoxose units. It differs from digitoxin by a hydroxy group at the C-12 of the aglycon.
Digitoxose - Digitoxose - Digitoxose - Digoxigenin
The structurally related steroid glycosides from the Strophanthus species - k-Strophanthin and g-Strophanthin - contain several hydroxyl groups in the aglycon. These cause a much higher water solubility than Digitalis derivatives. The g-Strophanthin found in Strophanthus gratus and Acokanthera ouabaio in English is named Ouabain.
glucose - glucose - cymarose - k-strophanthidin
Today, this term is used exclusively in scientific literature. In contrast to the hydrolysis stable digoxin, digitoxin and ouabain, k-Strophanthin is very easily cleaved by acid and bases. The k-Strophanthin from Strophanthus kombé (Kombetin) used for therapeutic purposes therefore always contains small amounts of k-Strophanthin-β (produced by the elimination of one unit of glucose) and k-Strophanthin-α (produced by the elimination of two units of glucose). k-Strophanthin-α is identical to Cymarin obtained from the Adonis rose.
Rhamnose - g-Strophanthidin (rhamnose - ouabagenin)
In addition to the natural active ingredients, semi-synthetic digoxin derivatives β -acetyl digoxin (trade name Novodigal) and β -methyl digoxin (trade name Lanitop) have also been successfully used in therapy. These derivatives have an improved absorption compared to digoxin. They release digoxin in the body and therefore have an effect identical to digoxin.