Abstract: The present disclosure concerns an in-vitro full skin model which comprises a dermal equivalent and epidermal equivalent as well as from about 1 to about 100 three-dimensional sweat gland equivalents with respectively from about 500 to about 500000 sweat gland cells as well as a diameter of respectively from about 100 to about 6000 ?m on a supporting layer. Furthermore, the present disclosure concerns the production of the full skin model as well as the use of this model as an in-vitro model, in screening methods as well as for in-vitro evaluation of the influence of cosmetic substances on the inhibition of sweat secretion as well as body odor.

Abstract: The present disclosure relates to a method for improving the culture conditions of cultures of primary sweat gland cells and/or three-dimensional sweat gland equivalents, where the culture with from about 500 to about 500,000 sweat gland cells and a diameter of from about 100 to about 6,000 nm is initially prepared and then cultivated in a culture medium with neurotransmitters and/or from about 11 to about 100 ng/ml of at least one growth factor. Cultivation of these cells and models in a culture medium containing at least one neurotransmitter and/or from about 11 to about 100 ng/ml of at least one growth factor leads to an increase of sweat-gland-specific marker proteins. As a result, a loss of function, which occurs with an absence of or only low expression of these markers, can be avoided.

Abstract: A method for the in-vitro investigation of sweating processes, in which a three-dimensional sweat gland equivalent is stimulated adrenergically, and the reaction of the three-dimensional sweat gland equivalent is determined by measuring the cyclic adenosine monophosphate (cAMP) content.

Abstract: The present disclosure concerns an in-vitro method for the identification and analysis of proteins with a stem cell function, in which initially, at least one three-dimensional sweat gland equivalent with from about 500 to about 500000 sweat gland cells as well as a diameter of from about 100 to about 6000 ?m is provided and subsequently, proteins with a stem cell function in this equivalent are identified and analyzed. Preferably, in a further step c) of the method, the influence of test substances on the proteins previously identified in step b) is investigated. Because the three-dimensional sweat gland equivalents used in step a) comprise differently differentiated cells and emulate the in-vivo situation well, the measured data obtained with the in-vitro method as contemplated herein can readily be applied to the in-vivo situation.

Abstract: The present disclosure relates to an in-vitro method for identifying and analyzing secretion proteins, in which a three-dimensional sweat gland equivalent having from about 500 to about 500,000 sweat gland cells and a diameter of from about 100 to about 6,000 ?m is firstly provided and then any secretion proteins present in this equivalent are infected and analyzed. In a further method step c) the influence of test substances on the proteins identified previously in step b) is examined. Since the three-dimensional sweat gland equivalents used in step a) comprise differently differentiated cells and portray the in-vivo situation well, the measurement data obtained with the in-vitro method as contemplated herein can be transferred well to the in-vivo situation.

Abstract: The present disclosure relates to an in-vitro method for identifying and analyzing ion channels and/or water channels and/or receptors of signal transduction, in which a three-dimensional sweat gland equivalent having from about 500 to about 500,000 sweat gland cells and a diameter of from about 100 to about 6,000 ?m is firstly provided and then any ion channels and/or water channels and/or receptors of signal transduction present in this equivalent are infected and analysed. In a further method step c) the influence of test substances on the proteins identified previously in step b) is examined. Since the three-dimensional sweat gland equivalents used in step a) comprise differently differentiated cells and portray the in-vivo situation well, the measurement data obtained with the in-vitro method as contemplated herein can be transferred well to the in-vivo situation.

Abstract: The present disclosure concerns an in-vitro full skin model which comprises a dermal equivalent and epidermal equivalent as well as from about 1 to about 100 three-dimensional sweat gland equivalents with respectively from about 500 to about 500000 sweat gland cells as well as a diameter of respectively from about 100 to about 6000 ?m on a supporting layer. Furthermore, the present disclosure concerns the production of the full skin model as well as the use of this model as an in-vitro model, in screening methods as well as for in-vitro evaluation of the influence of cosmetic substances on the inhibition of sweat secretion as well as body odor.

Abstract: The present disclosure relates to a method for improving the culture conditions of cultures of primary sweat gland cells and/or three-dimensional sweat gland equivalents, where the culture with from about 500 to about 500,000 sweat gland cells and a diameter of from about 100 to about 6,000 nm is initially prepared and then cultivated in a culture medium with neurotransmitters and/or from about 11 to about 100 ng/ml of at least one growth factor. Cultivation of these cells and models in a culture medium containing at least one neurotransmitter and/or from about 11 to about 100 ng/ml of at least one growth factor leads to an increase of sweat-gland-specific marker proteins. As a result, a loss of function, which occurs with an absence of or only low expression of these markers, can be avoided.

Abstract: Surprisingly, it has now been found that, when a hair care agent including at least one casein hydrolysate is applied, the hair growth itself and thus also the structure, elasticity, strength, resistance, and shine of the keratin fiber are significantly improved. Furthermore, is has surprisingly been found that the compositions according to the invention are suitable for triggering the release of growth factors and for strengthening and thickening the hair by stimulating the proliferation of the hair keratinocytes. The stimulation of the keratinocytes of the outer root sheath, which are partly responsible for the formation of the hair shaft, occurs by means of the growth factors HGF and KGF. Effects such as the “overconditioning” of the hair are avoided by means of the biologically based hair thickening. The hair grows more intensely from the root on and with a larger diameter, so this effect is particularly long-lasting.