Search PubMed⌕ Search

PubMed · 10408025

[Sex differences in morphologic aging processes].

Abstract

According to Max Bürger (2) it is justified to speak of sexual divergence of biomorphosis. Morphometrical investigations have proved the existence of such sexual differences. The following results were obtained: The first example concerns the increase of fatty tissue in parathyroid glands which we measured on histological slides of 135 human samples by means of the point counting method. The fatty tissue of males was shown to increase continuously with statistic significance, whereas this process stops in females during their generative phase between the 2nd and 5th decade. Evidence for the sexual divergence was also obtained by investigating the fatty tissue between the bundles of muscle fibers of the tongue, however, without being able to statistically verify these results. We found the same sexual differences by measuring the muscle cell regression and connective tissue proliferation in the ciliary muscle of human eyes and tunica muscularis of the small intestine as well. All findings prove that the female is able to stay biologically younger during her generative activity compared to males. After menopause the aging processes speed up in female tissues without making up for the "age lead" of males. It is also worth mentioning that macroscopic anthropometric features do confirm the same fact, e.g., length and breadth of human auricles, ranging in age from 18 to 51 years.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

P Rother, I Reibiger, S Klinger. 1999. [Sex differences in morphologic aging processes].. https://doi.org/10.1007/s003910050081

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Rapidly decellularized adipose tissue induces soft tissue vascularization in potential anatomical spaces.

Decellularized tissues provide biological cues owing to the wealth of structural and regulatory factors that promote angiogenesis, adipogenesis, and myogenesis and facilitate neurite outgrowth. Here, we demonstrated the advantages of decellularized adipose tissue (adipoECM) over defined collagen-based biomaterials for host tissue integration. Three batches of human adipose tissue were decellularized using a rapid decellularization protocol and analyzed using mass spectrometry. To assess the biological activity of the decellularized materials, adipoECM and a reference standard of care biomaterial (Integra®DRT, also containing collagen I and glycosaminoglycans) were implanted subcutaneously, but far from the wound bed (in anatomical potential spaces) of immunocompetent BALB/c mice. The mice were euthanized in the acute (1 day) and chronic (day 60) inflammatory reaction phases, followed by biomaterial excision and Masson’s trichrome immunohistofluorescence imaging of the paraffin-embedded specimens. Each batch of processed tissue passed a quality control check, showing a low level of donor genomic DNA, lack of nuclei, lipids, endotoxins, and bacterial contamination. Mass spectrometry revealed that all batches of decellularized tissue mainly contained collagen I and, to a lesser degree, collagen III, collagen IV, collagen V, laminin, fibrillin, fibronectin, tenascin, and elastin. No acute inflammatory reaction was observed in either material one day post-transplantation. At 60 days post-implantation, different cell types were detected in adipoECM specimens, whereas Integra®DRT remained acellular. Additional immunohistochemical staining of adipoECM revealed CD31-positive cells in the blood vessels. Mesenchymal (CD90 positive) and myeloid (CD14 positive) cells were also detected. Primary cell types involved in soft tissue healing and remodeling were found in the adipoECM-treated group. The ingrowth of blood vessels and mesenchymal cells confirmed the effective integration of adipoECM with host tissues. Our results demonstrate that decellularized adipose tissue implanted away from the wound bed possesses contextual biological activities that promote efficient integration with host tissues.

Adipose Tissue↗

Characterization of a new member of the fatty acid-binding protein family that binds all-trans-retinol.

Cellular retinol-binding protein, type I (CRBP-I) and type II (CRBP-II) are the only members of the fatty acid-binding protein (FABP) family that process intracellular retinol. Heart and skeletal muscle take up postprandial retinol but express little or no CRBP-I or CRBP-II. We have identified an intracellular retinol-binding protein in these tissues. The 134-amino acid protein is encoded by a cDNA that is expressed primarily in heart, muscle and adipose tissue. It shares 57 and 56% sequence identity with CRBP-I and CRBP-II, respectively, but less than 40% with other members of the FABP family. In situ hybridization demonstrates that the protein is expressed at least as early as day 10 in developing heart and muscle tissue of the embryonic mouse. Fluorescence titrations of purified recombinant protein with retinol isomers indicates binding to all-trans-, 13-cis-, and 9-cis-retinol, with respective K(d) values of 109, 83, and 130 nm. Retinoic acids (all-trans-, 13-cis-, and 9-cis-), retinals (all-trans-, 13-cis-, and 9-cis-), fatty acids (laurate, myristate, palmitate, oleate, linoleate, arachidonate, and docosahexanoate), or fatty alcohols (palmityl, petrosenlinyl, and ricinolenyl) fail to bind. The distinct tissue expression pattern and binding specificity suggest that we have identified a novel FABP family member, cellular retinol-binding protein, type III.

Adipose Tissue↗

Ergastoplasmic paracrystalline inclusion bodies in the adipose gonadal envelope and fat body of the glow worm, Lampyris noctiluca (Insecta, Coleoptera).

The gonads of glow worm larvae are enveloped by adipose tissue which represents a specialized fat body. The adipose gonadal envelope, and also to a lesser extent the fat body cells, contain tubular paracrystalline inclusion bodies (PIBs). Cells of other tissues are devoid of such inclusions. The PIBs form in the cisternae of rough ER. In young larvae PIB formation is sparse, but at advanced larval stages PIBs often occur as bundles in stacks of ergastoplasm. Typically, a PIB within a cisterna consists of four to seven parallel tubules. The outer diameter of a tubule is ca 28.8 nm and the width of the tubule lumen ca 12.2 nm. The "wall" of a tubule contains globular protein subunits of ca 8.3 nm diameter; the subunits are arranged helically. Since the adipose gonadal envelope progresses through a cytological differentiation process during differentiation and maturation of the gonads, the increased number of PIBs may indicate enhanced metabolic activity of the tissue related to nutrition of the growing gonads.

Adipose Tissue↗