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      Growth of cell populations of the intralobular duct in the submandibular gland of the mouse during postnatal development Translated title: Crescimento das populações de células dos ductos intralobulares na glândula submandibular do camundongo durante o desenvolvimento pós-natal

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          Abstract

          The growth of cell populations of intercalated ducts (ID), striated ducts (SD) and convoluted granular tubules (CGT) of the submandibular gland of the mouse was analyzed, during the period of 14 to 84 days of postnatal life, by means of morphometric methods. The absolute number of cells in each type of duct was submitted to curve fitting by means of linear regression analysis, and the obtained equations were: y = 13.22 + 0.87x for ID cells in the growth period of 14 to 84 days; y = -18.82 + 3.69x and y = 176.03 - 1.93x for SD cells in the periods of growth and decay of cells, from 14 to 35 and 35 to 84 days, respectively; and y = 90.59 + 4.60x for CGT cells in the growth period of 28 to 84 days. Based on these equations, the daily accumulation (growth rate) or loss (decaying rate) of cells in the period covered by each equation was calculated. Thus, the rate of growth of ID cells was 0.87 x 10(5) cells/day; the growth and decline rates of SD cells were 3.69 x 10(5) cells/day and -1.93 x 10(5) cells/day, respectively; and the growth rate of CGT cells was 4.60 x 10(5) cells/day. The analysis of the accumulation or loss of cells and the balance of cell populations in the various types of ducts revealed that SD cells were transformed into CGT cells and that the growth of these cells’ population also depends on the formation of new cells through proliferative activity, probably in the intercalated ducts.

          Translated abstract

          O crescimento de população de células dos ductos intercalares, ductos estriados e túbulos granulares convolutos de glândulas submandibulares do camundongo durante o período de 14 a 84 dias de vida pós-natal, foi avaliada por métodos morfométricos. Os dados de número absoluto de células em cada tipo de ducto foram submetidos a ajuste de curva por análise de regressão linear e as equações obtidas foram: y = 13,22 + 0,87x para as células dos ductos intercalares no período de crescimento de 14 a 84 dias; y = 18,82 + 3,69x e y = 176,03 - 1,93x para as células dos ductos estriados nos períodos de crescimento e decaimento, respectivamente, de 14 a 35 e 35 a 84 dias; e y = 90,59 + 4,60x para as células dos túbulos granulares convolutos no período de crescimento de 28 a 84 dias. À partir dessas equações, o acúmulo diário (velocidade de crescimento) ou a perda diária (velocidade de decaimento) de células em cada período, foram calculados. Assim, a velocidade de crescimento das células dos ductos intercalares foi 0,87 x 10(5) células/dia; as velocidades de crescimento e decaimento de células dos ductos estriados foram, respectivamente, 3,69 x 10(5) células/dia e -1,93 x 10(5) células/dia; e a velocidade de crescimento das células dos túbulos convolutos foi 4,60 x 10(5) células/dia. Análise do acúmulo ou da perda de células e o balanço entre o crescimento das várias populações celulares ductais, mostraram numericamente que as células dos ductos estriados transformaram-se em células dos túbulos granulares convolutos e que o crescimento total na população dessas últimas células também depende da formação de novas células por atividade proliferativa, provavelmente nos ductos intercalares.

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          Notes on the estimation of the numerical density of arbitrary profiles: the edge effect

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            The cytology of salivary glands.

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              Notes on the estimation of the numerical density of arbitrary profiles: the edge effect

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                pob
                Pesquisa Odontológica Brasileira
                Pesqui. Odontol. Bras.
                Sociedade Brasileira de Pesquisa Odontológica e Faculdade de Odontologia da Universidade de São Paulo (São Paulo )
                1517-7491
                December 2002
                : 16
                : 4
                : 285-291
                Affiliations
                [1 ] School of Dentistry of Bauru
                [2 ] Universidade de São Paulo Brazil
                Article
                S1517-74912002000400002
                10.1590/S1517-74912002000400002
                35dacd4c-db72-436d-ad73-3191b881dc4e

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1517-7491&lng=en
                Categories
                DENTISTRY, ORAL SURGERY & MEDICINE

                Dentistry
                Corpo estriado,Glândula submandibular,Desenvolvimento,Cells,Corpus striatum,Submandibular gland,Development,Células

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