Breast Milk May Hold The Cure For Cancer
Posted: Mon Apr 04, 2005 10:17 am
This may not be recent news, but noteworthy.
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Newsletter #58March/April 2000
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New Research Links Breast Milk To Cancer Cell Death
by Jane Sprague Zones
Despite evidence of widespread pesticide contamination in breast milk, the benefits of breast-feeding have long been touted by the medical community and many women's health advocates alike. Some advantages of breast-feeding over bottle-feeding are well established for infant health: Breast-fed babies show greater immunity to a variety of communicable diseases, as well as enhanced cognitive development. They have a lower risk of some childhood cancers, including acute leukemias1, Hodgkin's disease2, and lymphoma.3
Breast-feeding also appears to lower the risk of breast and ovarian cancer in mothers who nurse their babies. Research supporting this is mixed, but about half of the major controlled studies done thus far have found a significant reduction in breast cancer risk among premenopausal women who breast-feed, particularly among those who first lactate at a younger age and for longer total duration.4 (Negative or insignificant findings in other studies have been attributed to the generally short duration of breast-feeding in this country, among other variables. For a good review of this literature see "Lactation and the Risk of Breast Cancer," by Jennifer L. Kelsey and Esther M. John, in the January 13, 1994, issue of the New England Journal of Medicine, pp.136-137.)
An Unintentional Discovery
Intriguing new developments indicate an even broader role for breast milk in assaulting cancer. In 1992 a Swedish graduate student, Anders Hakansson, accidentally observed mothers' milk bring about cancer cell death in his laboratory4.
Hakansson, his professor Catharina Svanborg, and their colleagues have since studied and resolved the means by which breast milk kills human cancer cells of all kinds. Synthesizing the critical components, the researchers are working on ways to develop usable treatments for cancer and bacterial infections. Svanborg is a physician immunologist at Lund University, and her primary interest has been in fighting communicable diseases.
The process that Hakansson observed is a hot, relatively new object of study in biology known as apoptosis, the systematic process by which cells, responding to environmental signals, self-destruct. it is the natural mechanism the body uses to recycle material that is not needed for functioning, a means of maintaining order. When apoptosis is initiated, the cell dries out and shrivels, and its genetic material becomes shredded so that the cell can not duplicate itself. With cancer cells, apoptosis is inhibited, allowing rapid growth of. dysfunctional cells.
Funding for Svanborg's work has been hampered by skepticism from American scientists, who dominate cancer research. Hers is a small operation in a foreign country, and its focus on apoptosis represents a relatively recent shift in their research, emanating from Hakansson's fortuitous discovery. Their first research paper on this topic was published in 1995 5, which led to a $200,000 grant from the American Cancer Society-the ACS's only foreign grant at the time. Hakansson continues to work with Svanborg, and their group is now collaborating with researchers from Stockholm's Karolinska Institute and Oxford University in England.
Unfurling the Mystery
The collaborative's research focuses on a protein known as alpha- lactalbumin, dubbed alpha-lac for short. When alpha-lac's amino acid chain is folded completelyits usual configurationit assists in the production of lactose, the sugar found in milk.
As alpha-lac unfolds, however (and scientists are unclear as to what prompts it to do so), it ignites the process of apoptosis in cancer cells. The unfurled version of alpha-lac is termed HAMLET, an acronym for human alpha-lactalbumin made lethal to tumors.
Svanborg's team has figured out how alpha-lac transforms into an executioner of cancer cells, and has characterized and genetically engineered HAMLET. The protein requires an acidic environment to make this change, along with a component from breast milk that the team has identified but is keeping confidential (presumably for commercial reasons).
Preliminary animal testing suggests that mice given large doses of HAMLET experience few observable side effects, a rarity in cancer treatments. The research group is optimistic that HAMLET can be made into an effective cancer combatant with little deleterious impact for humans. But the process of testing the substance in animal tumors, and then in human safety and effectiveness trials, could take years.
The isolation of HAMLET as a trigger for apoptosis in cancer cells gives further weight to the value of breast milk as a natural means of strengthening the human body. Pediatricians and other child and-maternal health advocates enthusiastically endorse breast-feeding, despite evidence that breast milk is widely contaminated by pesticides and other chemical pollutants in the environment. Most international studies of human milk have detected DDT and other organochlorine pesticides in human milk. In Swedenwhere use of chlorinated phenols as pesticides has been prohibitedthe concentration of such pollutants in breast milk has declined over time.6
Because breast milk is at the head of the human food chain, its toxins are more concentrated than those in animal-based foods. Walter Rogan, a researcher at the National Institute of Environmental Health Sciences, points out that breast milk does not meet the Food and Drug Administration's standards of purity required of infant formula.7
There are very few studies of, the damage this may cause a child who has been nursed, and because of the known benefits, public health promoters continue to urge new mothers to nurse their offspring. Biologist Sandra Steingraber, author of Living Downstream: A Scientist's Personal Investigation of Cancer and the Environment, believes that rather than choose between tainted breast milk (with all of its benefits) and nutritionally inferior but less contaminated formula, we need to eradicate the environmental toxins that inevitably wind up polluting our breasts.8
Approximations of mothers' milk and its components, such as infant formula and genetically engineered HAMLET, serve significant and potentially wonderful functions, but we also need to keep our attention on the fundamental work that preserves a nourishing and healthy environment for human beings.
1 Shu, X.O. et al., "Breast-Feeding and Risk of Childhood Acute Leukemia," Journal of the National Cancer Institute, 1999, vol. 91, no. 20, pp. 1765-72.
2 Davis, M.K. "Review of the Evidence for an Association Between Infant Feeding and Childhood Cancer," International Journal of Cancer (supplement), 1998, vol. 11, pp. 29-33.
3 Radetsky, P. "Got cancer killers?" Discover, June 1999.
4 Labbok, M.H. "Health Sequelae of Breast-Feeding for the Mother," Clinics in Perinatology, June 1999, vol. 26, no. 2, pp. 491-503.
5 Hakansson, A. et al., "Apoptosis induced by a Human Milk Protein," Proceedings of the National Academy of Sciences, 1995, vol. 92, pp 8064-68.
6 Anwar, W.A. "Biomarkers of Human Exposure to Pesticides," Environmental Health Perspectives, 1997, vol. 105 (supplement 4), pp. 801-06.
7 Rogan, W.J. "Pollutants in Breast Milk," Archives of Pediatric and Adolescent Medicine, 1996, vol. 150, pp. 981-90.
8 Steingraber, S. "Human Breast Milk Contamination." The Ribbon, Fall 1999, voll. 4, no. 3, pp. 8-10.
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© 2005, Breast Cancer Action
http://www.bcaction.org/Pages/Searchabl ... r058J.html
Newsletter #58March/April 2000
Return to Search (http://www.bcaction.org/Pages/GetInform ... earch.html) | Return to Chronological List (http://www.bcaction.org/Pages/GetInform ... hrono.html)
New Research Links Breast Milk To Cancer Cell Death
by Jane Sprague Zones
Despite evidence of widespread pesticide contamination in breast milk, the benefits of breast-feeding have long been touted by the medical community and many women's health advocates alike. Some advantages of breast-feeding over bottle-feeding are well established for infant health: Breast-fed babies show greater immunity to a variety of communicable diseases, as well as enhanced cognitive development. They have a lower risk of some childhood cancers, including acute leukemias1, Hodgkin's disease2, and lymphoma.3
Breast-feeding also appears to lower the risk of breast and ovarian cancer in mothers who nurse their babies. Research supporting this is mixed, but about half of the major controlled studies done thus far have found a significant reduction in breast cancer risk among premenopausal women who breast-feed, particularly among those who first lactate at a younger age and for longer total duration.4 (Negative or insignificant findings in other studies have been attributed to the generally short duration of breast-feeding in this country, among other variables. For a good review of this literature see "Lactation and the Risk of Breast Cancer," by Jennifer L. Kelsey and Esther M. John, in the January 13, 1994, issue of the New England Journal of Medicine, pp.136-137.)
An Unintentional Discovery
Intriguing new developments indicate an even broader role for breast milk in assaulting cancer. In 1992 a Swedish graduate student, Anders Hakansson, accidentally observed mothers' milk bring about cancer cell death in his laboratory4.
Hakansson, his professor Catharina Svanborg, and their colleagues have since studied and resolved the means by which breast milk kills human cancer cells of all kinds. Synthesizing the critical components, the researchers are working on ways to develop usable treatments for cancer and bacterial infections. Svanborg is a physician immunologist at Lund University, and her primary interest has been in fighting communicable diseases.
The process that Hakansson observed is a hot, relatively new object of study in biology known as apoptosis, the systematic process by which cells, responding to environmental signals, self-destruct. it is the natural mechanism the body uses to recycle material that is not needed for functioning, a means of maintaining order. When apoptosis is initiated, the cell dries out and shrivels, and its genetic material becomes shredded so that the cell can not duplicate itself. With cancer cells, apoptosis is inhibited, allowing rapid growth of. dysfunctional cells.
Funding for Svanborg's work has been hampered by skepticism from American scientists, who dominate cancer research. Hers is a small operation in a foreign country, and its focus on apoptosis represents a relatively recent shift in their research, emanating from Hakansson's fortuitous discovery. Their first research paper on this topic was published in 1995 5, which led to a $200,000 grant from the American Cancer Society-the ACS's only foreign grant at the time. Hakansson continues to work with Svanborg, and their group is now collaborating with researchers from Stockholm's Karolinska Institute and Oxford University in England.
Unfurling the Mystery
The collaborative's research focuses on a protein known as alpha- lactalbumin, dubbed alpha-lac for short. When alpha-lac's amino acid chain is folded completelyits usual configurationit assists in the production of lactose, the sugar found in milk.
As alpha-lac unfolds, however (and scientists are unclear as to what prompts it to do so), it ignites the process of apoptosis in cancer cells. The unfurled version of alpha-lac is termed HAMLET, an acronym for human alpha-lactalbumin made lethal to tumors.
Svanborg's team has figured out how alpha-lac transforms into an executioner of cancer cells, and has characterized and genetically engineered HAMLET. The protein requires an acidic environment to make this change, along with a component from breast milk that the team has identified but is keeping confidential (presumably for commercial reasons).
Preliminary animal testing suggests that mice given large doses of HAMLET experience few observable side effects, a rarity in cancer treatments. The research group is optimistic that HAMLET can be made into an effective cancer combatant with little deleterious impact for humans. But the process of testing the substance in animal tumors, and then in human safety and effectiveness trials, could take years.
The isolation of HAMLET as a trigger for apoptosis in cancer cells gives further weight to the value of breast milk as a natural means of strengthening the human body. Pediatricians and other child and-maternal health advocates enthusiastically endorse breast-feeding, despite evidence that breast milk is widely contaminated by pesticides and other chemical pollutants in the environment. Most international studies of human milk have detected DDT and other organochlorine pesticides in human milk. In Swedenwhere use of chlorinated phenols as pesticides has been prohibitedthe concentration of such pollutants in breast milk has declined over time.6
Because breast milk is at the head of the human food chain, its toxins are more concentrated than those in animal-based foods. Walter Rogan, a researcher at the National Institute of Environmental Health Sciences, points out that breast milk does not meet the Food and Drug Administration's standards of purity required of infant formula.7
There are very few studies of, the damage this may cause a child who has been nursed, and because of the known benefits, public health promoters continue to urge new mothers to nurse their offspring. Biologist Sandra Steingraber, author of Living Downstream: A Scientist's Personal Investigation of Cancer and the Environment, believes that rather than choose between tainted breast milk (with all of its benefits) and nutritionally inferior but less contaminated formula, we need to eradicate the environmental toxins that inevitably wind up polluting our breasts.8
Approximations of mothers' milk and its components, such as infant formula and genetically engineered HAMLET, serve significant and potentially wonderful functions, but we also need to keep our attention on the fundamental work that preserves a nourishing and healthy environment for human beings.
1 Shu, X.O. et al., "Breast-Feeding and Risk of Childhood Acute Leukemia," Journal of the National Cancer Institute, 1999, vol. 91, no. 20, pp. 1765-72.
2 Davis, M.K. "Review of the Evidence for an Association Between Infant Feeding and Childhood Cancer," International Journal of Cancer (supplement), 1998, vol. 11, pp. 29-33.
3 Radetsky, P. "Got cancer killers?" Discover, June 1999.
4 Labbok, M.H. "Health Sequelae of Breast-Feeding for the Mother," Clinics in Perinatology, June 1999, vol. 26, no. 2, pp. 491-503.
5 Hakansson, A. et al., "Apoptosis induced by a Human Milk Protein," Proceedings of the National Academy of Sciences, 1995, vol. 92, pp 8064-68.
6 Anwar, W.A. "Biomarkers of Human Exposure to Pesticides," Environmental Health Perspectives, 1997, vol. 105 (supplement 4), pp. 801-06.
7 Rogan, W.J. "Pollutants in Breast Milk," Archives of Pediatric and Adolescent Medicine, 1996, vol. 150, pp. 981-90.
8 Steingraber, S. "Human Breast Milk Contamination." The Ribbon, Fall 1999, voll. 4, no. 3, pp. 8-10.
Return to Search (http://www.bcaction.org/Pages/GetInform ... earch.html) | Return to Chronological List (http://www.bcaction.org/Pages/GetInform ... hrono.html)
(http://www.bcaction.org/Pages/LearnAbou ... eInfo.html)Site Info (http://www.bcaction.org/Pages/LearnAbou ... eInfo.html) [06.626] 01.15.01
© 2005, Breast Cancer Action