Hypophosphatasia and the Role of Alkaline Phosphatase in Skeletal Mineralization*

1994 ◽  
Vol 15 (4) ◽  
pp. 439-461 ◽  
Author(s):  
MICHAEL P. WHYTE
Keyword(s):  
Alkaline Phosphatase ◽  
Skeletal Mineralization

First repeated bone scan in the observation of patients with operable breast cancer.

1986 ◽  
Vol 4 (3) ◽  
pp. 389-394 ◽  
Author(s):  
A Pedrazzini ◽  
R Gelber ◽  
M Isley ◽  
M Castiglione ◽  
A Goldhirsch
Keyword(s):  
Breast Cancer ◽  
Alkaline Phosphatase ◽  
Bone Scan ◽  
Serum Alkaline Phosphatase ◽  
Clinical Situation ◽  
Operable Breast Cancer ◽  
First Relapse ◽  
Bone Scans ◽  
First Recurrence

Data on 1,601 patients with node-positive operable breast cancer who were randomized in four different prospective adjuvant therapy trials were analyzed to evaluate the role of routine bone scans and the alkaline phosphatase value at regular intervals in screening for bone involvement. Bone scan was a prerequisite for randomization and was repeated within the first 12 months in 90% (1,441) of the patients. Abnormal or doubtful scan findings had to be verified by x-ray examination. The repeated scan results were normal in 1,263 (87.8%) patients, doubtful but with no radiologic evidence of bone metastasis in 161 (11%), and abnormal (radiologically confirmed) in 17 (1.2%). After a median observation of 4 years bone metastases as the first relapse developed in 136 (8.5%) patients. This occurred in 87 of 1,263 (6.9%) of the patients with normal repeated scan results and in 18 of 161 (11.2%) of those with doubtful repeated scan findings. Based on the results of the first repeated scan, early detection of a first recurrence in bone might have been possible for 2.4% of the population. Serum alkaline phosphatase levels were also without clinical use. Bone scan in the observation of patients with operable breast cancer should be performed only as dictated by the clinical situation.

scholarly journals Exploring the role of a glycine cluster in cold adaptation of an alkaline phosphatase

2002 ◽  
Vol 269 (9) ◽  
pp. 2330-2335 ◽  
Author(s):  
Konstantinos Mavromatis ◽  
Iason Tsigos ◽  
Maria Tzanodaskalaki ◽  
Michael Kokkinidis ◽  
Vassilis Bouriotis
Keyword(s):  
Alkaline Phosphatase ◽  
Cold Adaptation

scholarly journals Pathophysiological Role of Vascular Smooth Muscle Alkaline Phosphatase in Medial Artery Calcification

2015 ◽  
Vol 30 (5) ◽  
pp. 824-836 ◽  
Author(s):  
Campbell R Sheen ◽  
Pia Kuss ◽  
Sonoko Narisawa ◽  
Manisha C Yadav ◽  
Jessica Nigro ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Smooth Muscle ◽  
Vascular Smooth Muscle ◽  
Pathophysiological Role ◽  
Medial Artery Calcification ◽  
Medial Artery

Role of alkaline phosphatase in colitis in man and rats

Gut ◽  
2008 ◽  
Vol 58 (3) ◽  
pp. 379-387 ◽  
Author(s):  
A Tuin ◽  
K Poelstra ◽  
A de Jager-Krikken ◽  
L Bok ◽  
W Raaben ◽  
...  
Keyword(s):  
Alkaline Phosphatase

Acidosis inhibits osteoblastic and stimulates osteoclastic activity in vitro

1992 ◽  
Vol 262 (3) ◽  
pp. F442-F448 ◽  
Author(s):  
N. S. Krieger ◽  
N. E. Sessler ◽  
D. A. Bushinsky
Keyword(s):  
Alkaline Phosphatase ◽  
Metabolic Acidosis ◽  
Phosphatase Activity ◽  
Alkaline Phosphatase Activity ◽  
Collagen Synthesis ◽  
Calcium Flux ◽  
Osteoclastic Activity ◽  
Glucuronidase Activity

Metabolic acidosis induces net calcium flux (JCa) from cultured neonatal mouse calvariae through physicochemical and cell-mediated mechanisms. To determine the role of osteoblasts in acid-induced JCa, collagen synthesis and alkaline phosphatase activity were assessed in calvariae incubated in reduced pH and bicarbonate medium, a model of metabolic acidosis (Met), and compared with controls (Ctl). Collagen synthesis fell from 30.5 +/- 1.1 in Ctl to 25.1 +/- 0.4% with Met, and alkaline phosphatase decreased from 403 +/- 25 in Ctl to 298 +/- 21 nmol Pi.min-1.mg protein-1 with Met. During acidosis JCa was correlated inversely with percent collagen synthesis (r = -0.743, n = 11, P = 0.009) and with alkaline phosphatase activity (r = -0.453, n = 22, P = 0.034). To determine the role of osteoclasts in acid-induced JCa, osteoclastic beta-glucuronidase activity was determined in Ctl and Met in the absence or presence of the osteoclastic inhibitor calcitonin (CT, 3 x 10(-9) M). Met increased beta-glucuronidase (5.9 +/- 0.2) compared with Ctl (4.6 +/- 0.3 micrograms phenolphthalein released.bone-1.h-1), whereas CT inhibited beta-glucuronidase in both Ctl and Met (3.1 +/- 0.2 and 3.5 +/- 0.3, respectively). During acidosis JCa was correlated directly with beta-glucuronidase activity (r = 0.683, n = 42, P less than 0.001). Thus the cell-mediated component of JCa during acidosis in vitro appears to result from a combination of inhibited osteoblastic and stimulated osteoclastic activity.

scholarly journals THE ROLE OF ALKALINE PHOSPHATASE IN OSTEOGENESIS

1951 ◽  
Vol 93 (5) ◽  
pp. 415-426 ◽  
Author(s):  
Robert S. Siffert
Keyword(s):  
Alkaline Phosphatase ◽  
Phosphatase Activity ◽  
Bone Matrix ◽  
Living Cells ◽  
Alkaline Solutions ◽  
Human Beings ◽  
Acid Media ◽  
Weakly Acid

The role of alkaline phosphatase in osteogenesis has been investigated by histochemical techniques with particular attention to its relationship to phosphate metabolism and matrix elaboration. The upper tibial epiphysis mainly, and other epiphyses as well of growing rabbits, and the costochondral junctions of newborn human beings were studied, as were bone grafts in growing rabbits. The findings in the newborn human beings were identical with those in the rabbits. Phosphatase activity and free phosphate localization do not universally coincide. The enzyme appears to be intimately related to preosseous cellular metabolism and to the elaboration of a bone matrix that is chemically calcifiable. It remains possible, however, that phosphatase may be in some way involved in making inorganic salts available to the calcifiable matrix. If this function does exist it is a secondary one, since the elaboration of bone matrix, which is always associated with phosphatase activity, can and does occur in the absence of calcification. Calcification may occur later, in the absence of the enzyme. There is evidence to suggest that cartilage matrix is utilized in the formation of bone matrix. Phosphatase is physiologically active only in the presence of living cells. Where it is demonstrable in the absence of living cells, as in the cartilage remnants of the metaphysis, it appears to be physiologically inactive. Since phosphatase is temporarily inactivated in weakly acid media, and readily reactivated by alkaline solutions it is possible that the enzyme might survive in a physiologically inactive state in weakly acid tissues, and yet remain capable of histochemical demonstration in vitro in an alkaline medium. Phosphatase is not related to the disappearance of chondroitin sulfate.

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