Recent findings regarding early lophotrochozoan development have altered the conventional model of neurogenesis and revealed that peripheral sensory elements play a key role in the initial organization of the larval nervous system. Here, we describe the main neurogenetic events in bivalve mollusks in comparison with other Lophotrochozoa, emphasizing a novel role for early neurons in establishing larval nervous systems and speculating about the morphogenetic function of the apical organ. We demonstrate that during bivalve development, peripheral sensory neurons utilizing various transmitters differentiate before the apical organ emerges. The first neurons and their neurites serve as a scaffold for the development of the nervous system. During veliger stage, cerebral, pleural, and visceral ganglia form along the lateral (visceral) nerve cords in anterior-to-posterior axis. The pedal ganglia and corresponding ventral (pedal) nerve cords develop much later, after larval settlement and metamorphosis. Pharmacological abolishment of the serotonin gradient within the larval body disrupts the navigation of “pioneer” axons resulting in malformation of the whole nervous system architecture. Comparative morphological data on neurogenetic events in bivalve mollusks shed new light on the origin of the nervous system, mechanisms of early axon navigation, and sequence of the tetraneurous nervous system formation. Furthermore, this information improves our understanding of the basic nervous system architecture in larval Bivalvia and Mollusca.
The organization of the body cavities is an important morphological trait that can be used for establishing the phylogenetic relationships between different groups of animals. In the present study, the hemocoel and coelomic systems of 10‐hr‐old juveniles and adults of the hermaphroditic oikopleurid Oikopleura gracilis were examined using light and transmission electron microscopy. The trunk hemocoel in 10‐hr‐old juveniles was represented by small clefts containing layers of extracellular matrix of adjacent tissues or interstices with migrating primordial germ syncytium. The wide hemocoel in the tail contained extracellular strands, subdividing the hemocoel into hemal sinuses. In adults, a large hemocoel appeared in the trunk and tail, and also contained extracellular strands. The hermaphroditic gonad was surrounded by its own lining, separating it from the hemocoel. The gamete‐filled cavity in the ovary and testis appeared only at late‐stage gonadogenesis, when the pre‐spawning reduction of syncytium occurred in the gonads. The true coelom in 10‐hr‐old juveniles and adults was represented by the pericardium. The lining of the pericardium consisted of myoepithelial and peritoneal cells. In the myoepithelial cells of 10‐hr‐old juveniles, myofibrils had been formed. The myoepithelial cells of adults had several parallel rows of completely differentiated myofibrils. The substantial reduction of the coelomic and circulatory systems in O. gracilis evidently results from the extreme shortening of ontogeny in appendicularians. Development in O. gracilis from early juvenile to adult involves the following steps, which also suggest how the tunicate heart may have evolved: a single‐layered coelomic sac gives rise to a grooved pericardium with an open hemal sinus (simple heart). In ascidians, this simple heart in turn gives rise to a closed tubular, double‐layered heart–pericardial complex, with a separate pericardial cavity and a closed heart, whose wall is formed by specialized myocardium.
The study was conducted to identify risk factors for cardiovascular complications in 38 women with HER2neu negative left breast cancer without severe cardiovascular pathology, related both to the clinical features of the patients and the treatmenbeing performed. Patients after radical mastectomy were hospitalized for chemotherapy (doxorubicin in a cumulative dose not exceeding 360 mg/m2) and 3D conformal radiation therapy on the left breast breast of chest radiation doses 39 Gy (equivalent to 48 Gy of normal functioning). Separation into groups was carried out depending on the age: from 20 to 59 years - 20 patients, from 60 to 74 years - 18 patients. It was revealed that the risk of cardiovascular complications in the Score Scale was significantly higher in elderly patients due to age, increased systolic blood pressure and hypercholesterolemia. These patients showed higher rates of BMI and abdominal obesity. The study of psychosocial factors has shown great importance of the transferred stress in the past. The patients of the second group showed high personal anxiety (55.4 ± 3.4, 95% CI 49,6-56,4). In 70% of middle-aged patients and 89% of elderly patients after chemotherapy and radiotherapy cardiotoxicity in the form of cardiac insufficiency of systolic and diastolic dysfunction and asymptomatic cardiac arrhythmias was revealed. (For citation: Vologdina IV, Zhabina RM, Poroshina EG, et al. Evaluation of cardiovascular risk factors in women with left breast cancer of middle-aged and elderly age at the stage of chemotherapy and radiotherapy. Herald of North-Western State Medical University named after I.I. Mechnikov. 2018;10(2):33-38. doi: 10.17816/mechnikov201810233-38).
Неокклюзионная форма острого нарушения мезентериального кровообращения: диагностика и лечение Д.м.н., проф. а.и. хриПун 1 , д.м.н., проф. а.н. аЛимОв 1 , к.м.н. а.Б. мирОнКОв 1, 2 , а.в. СавеЛьева 2 , д.м.н. а.Д. ПрямиКОв 1, 2 * 1 Кафедра хирургии и эндоскопии (зав.-д.м.н., проф. а.и. хрипун) факультета дополнительного профессионального образования ГБОу вПО «российский национально-исследовательский медицинский университет им. н.и. Пирогова», москва; 2 ГБуЗ «Городская клиническая больница им. в.м. Буянова» Департамента здравоохранения москвы (главный врач-к.м.н., доцент а.в. Саликов), москва, россия Ключевые слова: неокклюзионная форма острого нарушения мезентериального кровообращения, диагностика, лечение. Non-occlusive form of acute mesenteric circulatory disorders: diagnosis and treatment a.i. Khripun, a.n. aLimOv, a.B. mirOnKOv, a.v. SavELiEva, a.D. prYamiKOv Chair of surgery and endoscopy of the Department of advanced medical training of the n.i. pirogov's russian national research medical university, moscow, russian federation; v.m. Buyanov's City Clinical hospital, moscow, russia
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.