Calcium News and Research

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Calcium, the most abundant mineral in the body, is found in some foods, added to others, available as a dietary supplement, and present in some medicines (such as antacids). Calcium is required for muscle contraction, blood vessel expansion and contraction, secretion of hormones and enzymes, and transmitting impulses throughout the nervous system. The body strives to maintain constant concentrations of calcium in blood, muscle, and intercellular fluids, though less than <1% of total body calcium is needed to support these functions.

The remaining 99% of the body's calcium supply is stored in the bones and teeth where it supports their structure. Bone itself undergoes continuous remodeling, with constant resorption and deposition of calcium into new bone. The balance between bone resorption and deposition changes with age. Bone formation exceeds resorption in growing children, whereas in early and middle adulthood both processes are relatively equal. In aging adults, particularly among postmenopausal women, bone breakdown exceeds formation, resulting in bone loss that increases the risk of osteoporosis over time.

How negatively charged lipids stick to negatively charged DNA and self-organize into structures

Scientists studying the structure and interaction of negatively charged lipids and DNA molecules have created a "cookbook" for a class of nontoxic DNA delivery systems that will assist doctors and clinicians in the safe and effective delivery of genetic medicine.

13 Aug 2005

Taking parathyroid hormone followed by a year on alendronate shows strong osteoporosis benefit

Postmenopausal women who took a bone-building drug for one year followed by a year on a standard drug that fights bone loss experienced greater increases in bone density than has been reported from any other drug regimen, an NIH-sponsored study has found. Bone density is the standard predictor of fracture risk associated with osteoporosis.

11 Aug 2005

Researchers discover that tumors secrete fatty acids which inhibit the cytotoxic T lymphocytes' ability to kill tumor cells

Researchers have discovered that tumors release fatty acids that interfere with the cells that are trying to kill them. Consequently, strategies that reduce the amount of fatty acids surrounding the tumors may give a boost to anti-cancer therapeutics.

11 Aug 2005

$Experts predict that bone fractures will become a bigger and more costly problem$

Experts predict that bone fractures will become a bigger and more costly problem

With an aging population, and with people living longer, experts say bone fractures will become a bigger and more costly problem unless more is done to prevent them.

9 Aug 2005

Beta-blockers top choice for prevention and rate control for postoperative atrial fibrillation

The American College of Chest Physicians (ACCP) has released the first evidence-based clinical practice guidelines for the prevention and management of postoperative atrial fibrillation (AF) after cardiac surgery.

9 Aug 2005

Scientists identify protein that may inhibit cellular movement

Scientists from the University of North Carolina at Chapel Hill School of Medicine and the UNC Lineberger Comprehensive Cancer Center have identified a protein that may inhibit cellular movement, or migration.

8 Aug 2005

Doubt cast over study that says milk linked to ovarian cancer

Swedish researchers say that drinking just one glass of milk a day may increase the risk of women developing ovarian cancer.

7 Aug 2005

New research into muscle contraction will give scientists a better understanding of bladder problems and pain during childbirth

Professor Susan Wray, who heads the UK's top rated Department of Physiology, and Dr. Ted Burdyga, are studying muscles in the wall of the ureter, which connects the kidney to the bladder, to understand how muscles respond to signals in the body telling them to contract or relax.

1 Aug 2005

Loyola researchers hope that zoledronic acid will be effective and safe for patients with inflammatory bowel diseases (IBD)

Researchers at the Osteoporosis and Metabolic Bone Disease Center and the Division of Gastroenterology at Loyola University Health System are studying a once-yearly, 15-minute infusion of an intravenous (IV) medication in patients with osteopenia (low bone mass) and inflammatory bowel diseases (IBD) that, if proven effective, may be considered the standard of treatment.

26 Jul 2005

Vitamin D supplementation does not appear to prevent bone loss in postmenopausal black women

Although there is general agreement on the optimal calcium intake recommended for reducing postmenopausal bone loss, and it is recognized that vitamin D is important in calcium maintenance, the optimal intake of vitamin D is controversial, according to background information in the article.

25 Jul 2005

In vivo engineering of organs: The bone bioreactor

An international team of biomedical engineers has demonstrated for the first time that it is possible to grow healthy new bone reliably in one part of the body and use it to repair damaged bone at a different location.

25 Jul 2005

Calcium may help prevent the polyps, but not colorectal cancer

According to a new study, although calcium supplements may help prevent the polyps that often lead to colon cancer, it is still not clear whether calcium can prevent colorectal cancer itself.

21 Jul 2005

Researchers have doubled the potency of a protein that drives blood to clot

...according to research to be published in the July 26 edition of Biochemistry. The study results may have profound implications for the treatment of hemophilia, the inherited blood disorder that causes easy or excessive bleeding in 30,000 Americans.

20 Jul 2005

Alendronate combined with calcium and vitamin D almost completely prevented further bone loss in the first 4 months afte liver transplant

A new study found that the drug used to treat osteoporosis, when used in combination with calcium and vitamin D, can prevent the additional bone loss that commonly occurs after liver transplants. The treatment also helped stabilize bone loss in patients who already had osteoporosis, and helped improve their bone mineral density (BMD).

20 Jul 2005

Calcium may prevent polyps, but effect on colorectal cancer unclear

Although calcium supplements might prevent development of polyps that sometimes lead to colon cancer, there is not enough evidence that the mineral can prevent colorectal cancer itself, according to a new study.

19 Jul 2005

Chemical sealant - poloxamer 188 can repair damage to cardiac muscle cell membrane

A common chemical used in the manufacturing and pharmaceutical industries can repair damage to cardiac muscle cell membranes and prevent heart failure in mice with the genetic mutation that causes Duchenne muscular dystrophy, according to scientists at the University of Michigan Medical School.

18 Jul 2005

Study shows mutation in NOTCH1 gene causes aortic valve disease

By studying five generations of a Dallas family, UT Southwestern Medical Center researchers have discovered that a mutation in a key gene causes aortic valve disease, a common heart birth defect as well as a major contributor to adult heart disease.

18 Jul 2005

EU upholds food supplement ban - rejects appeal by health groups

The European Court of Justice has upheld a controversial law which could ban hundreds of vitamin and mineral supplements from being sold in Britain.

12 Jul 2005

New understanding of degeneration of brain cells in patients with Alzheimer's, Huntington's, and Parkinson's diseases

A ground-breaking new research approach to understanding the cellular processes of Alzheimer's and other degenerative diseases has revealed a promising pathway to the development of new types of drugs for these diseases.

11 Jul 2005

Carbon nanotubes may change the way doctors treat broken bones

Scientists have shown for the first time that carbon nanotubes make an ideal scaffold for the growth of bone tissue. The new technique could change the way doctors treat broken bones, allowing them to simply inject a solution of nanotubes into a fracture to promote healing.