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Journal of Dental Research
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Presence of Vesicles Containing Lactate Dehydrogenase in the Dentin of Bovine Tooth Germs

C. Kitamura

Department of Operative Dentistry, Kyushu Dental College, Manazuru 2-6-1, Kokurakita-ku, Kitakyushu 803, Japan

M. Terashita

Department of Operative Dentistry, Kyushu Dental College, Manazuru 2-6-1, Kokurakita-ku, Kitakyushu 803, Japan

T. Noguchi

Department of Biochemistry, Kyushu Dental College, Manazuru 2-6-1, Kokurakita-ku, Kitakyushu 803, Japan

The dentin was removed from bovine tooth germs, followed by the separation of the extracellular matrix vesicle fraction after collagenase treatment. Lactate dehydrogenase (LDH)-containing vesicles with a density different from that of matrix vesicles were detected in the matrix vesicle fraction. LDH in these vesicles did not result from cell lysis and vesicle capture during the preparation of the matrix vesicle fraction. The isoenzyme pattern of LDH in LDHcontaining vesicles was similar to that of cytosolic LDH of odontoblasts. Other cytosolic enzymes were not detected in LDH-containing vesicles, suggesting the presence of a mechanism for specific uptake of cytosolic LDH during the in vivo formation of the vesicles.

Journal of Dental Research, Vol. 70, No. 11, 1444-1446 (1991)
DOI: 10.1177/00220345910700111001
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C. Kitamura and M. Terashita
Expressions of c-jun and jun-B Proto-oncogenes in Odontoblasts during Development of Bovine Tooth Germs
Journal of Dental Research, April 1, 1997; 76(4): 822 - 830.
[Abstract] [PDF]